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Basler DECS-150 Instruction Manual

Digital excitation control system
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12570 Route 143 • Highland, Illinois 62249-1074 USA
Tel +1 618.654.2341 • Fax +1 618.654.2351
www.basler.com • info@basler.com
DECS-150
Digital Excitation Control System
Instruction Manual
Publication
9492600990 Rev H
Sep 2021

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Summary of Contents for Basler DECS-150

  • Page 1 DECS-150 Digital Excitation Control System Instruction Manual 12570 Route 143 • Highland, Illinois 62249-1074 USA Publication Tel +1 618.654.2341 • Fax +1 618.654.2351 9492600990 Rev H www.basler.com • info@basler.com Sep 2021...
  • Page 2 Please note that by posting this Proposition 65 warning, we are notifying you that one or more of the Proposition 65 listed chemicals may be present in products we sell to you. For more information about the specific chemicals found in this product, please visit https://www.basler.com/Prop65.
  • Page 3 Digital Excitation Control System Preface This instruction manual provides information about the installation and operation of the DECS-150. To accomplish this, the following information is provided: General information • Functional description • Installation and connections • BESTCOMSPlus software • ®...
  • Page 4 It is loaned for confidential use, subject to return on request, and with the mutual understanding that it will not be used in any manner detrimental to the interests of Basler Electric Company and used strictly for the purpose intended.
  • Page 5 Revision and Date H, Sep 2021 • Adjusted all front panel illustrations to show updated LED labeling • Added clarification about the DECS-150 sensing and responding to rms voltage Corrected explanation of the exciter diode monitor’s ripple • calculation Corrected the DECS-150’s breaker shunt trip output rating •...
  • Page 6 Updated Generator and Bus Voltage Sensing Ranges in the Specifications section Added Ingress Protection Ratings in the Specifications section • Updated Maritime Recognition specifications • Minor text edits throughout manual • ―, Sep 2015 Initial release • Revision History DECS-150...

  • Page 7: Table Of Contents

    Plus ............................19-1 ™ Communication ............................20-1 Configuration ............................21-1 Security ..............................22-1 Timekeeping ............................. 23-1 Testing ..............................24-1 Modbus Communication .......................... 25-1 Maintenance ............................. 26-1 Troubleshooting ............................27-1 Specifications ............................28-1 BESTCOMSPlus Settings Loader Tool ....................29-1 ® DECS-150 Contents...
  • Page 8 Digital Excitation Control System Contents DECS-150...

  • Page 9: Introduction

    Operating Mode settings screen. Power factor and var metering values will be opposite in motor mode. Excitation power is supplied from the DECS-150 by means of a filtered, switching power module that uses pulse-width modulation. It is capable of supplying 7 Adc (70°C ambient) continuously and 10 Adc (55°C ambient) continuously at nominal voltages of 63 or 125 Vdc.
  • Page 10 Ethernet and USB. Optional Features and Capabilities DECS-150 optional features and capabilities are defined by a style number. The model number and style number describe options and characteristics in a specific device and appear on a label affixed to the device.
  • Page 11 9492600990 Storage If a DECS-150 will not be placed in service right away, store it in the original shipping carton in a moisture- and dust-free environment. The temperature of the storage environment must be within the range of –40 to 85°C (–40 to 185°F).
  • Page 12 9492600990 Introduction DECS-150...

  • Page 13: Front Panel

    2 • Front Panel The DECS-150 front panel consists of 11 status LEDs. A USB port may be mounted on the front or rear panel of the DECS-150. Refer to the USB Mounting Option in the style chart in the Introduction section.
  • Page 14 ® VAR/PF Active This green LED lights when the DECS-150 is operating in either var or power factor mode. Var/power factor control is enabled through BESTCOMSPlus software. By default logic, Contact Input 7 (52 J/K) disables var/power factor control. An open contact enables the DECS-150 to control the machine reactive power in either the var or power factor mode.
  • Page 15 9492600990 USB Port This type B USB jack connects the DECS-150 with a PC operating BESTCOMSPlus for local communication. BESTCOMSPlus is supplied with the DECS-150. Caution In accordance with the guidelines defined in USB standards, the USB port on this device is not isolated. To prevent damage to a connected PC or laptop, the DECS-150 must be properly tied to ground.
  • Page 16 9492600990 Front Panel DECS-150...

  • Page 17: Power Input And Outputs

    When connecting single-phase operating power, use terminals 3 and 5 since the DECS-150 monitors the level of operating power through these terminals. The DECS-150 can be powered directly from a variety of sources as long as the DECS-150 input power specifications are followed (see the Specifications section).
  • Page 18 9492600990 Power Input and Output DECS-150...

  • Page 19: Voltage And Current Sensing

    IC+ and IC– through user-supplied current transformers (CTs). Single-phase machine sensing current is applied to DECS-150 terminals IB+ and IB–. The DECS-150 is compatible with CTs having 5 Aac or 1 Aac nominal secondary ratings. The DECS-150 uses this secondary rating, along with the CT nominal primary ratings to interpret the sensed current and calculate system parameters.
  • Page 20 Cross-current compensation (reactive differential) mode allows two or more paralleled generators to share a common reactive load. As shown in Figure 4-3, each generator is controlled by a DECS-150 using the DECS-150 cross-current compensation input (terminals CC+ and CC–) and a dedicated, external current transformer (CT) to sense generator current.
  • Page 21 Bus voltage monitoring enables bus failure detection and a 25 sync-check element, along with machine and bus voltage matching. Three-phase bus sensing voltage is applied to DECS-150 terminals B1, B2, and B3. This sensing voltage is typically applied through a user-supplied voltage transformer, but may be applied directly.
  • Page 22 9492600990 Voltage and Current Sensing DECS-150...

  • Page 23: Regulation

    9492600990 5 • Regulation The DECS-150 precisely regulates the level of supplied excitation power in each of the four available regulation modes. Stable regulation is enhanced by the automatic tracking of the active-mode setpoint by the inactive regulation modes. Pre-position setpoints within each regulation mode enable the DECS-150 to be configured for multiple system and application needs.
  • Page 24 The AVR/FCR Setpoints screen is illustrated in Figure 5-1. Figure 5-1. AVR/FCR Setpoints Screen When operating in var mode, the DECS-150 regulates the reactive power (var) output of the machine based on the var setpoint. The setting range of the var setpoint depends on the machine ratings and other associated settings.
  • Page 25 The var/PF Setpoints screen is illustrated in Figure 5-2. Power Factor When operating in Power Factor (PF) mode, the DECS-150 controls the var output of the machine to maintain the Power Factor setpoint as the kW load on the machine varies. The setting range of the PF setpoint is determined by the PF –...
  • Page 26 BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Parallel/Line Drop Compensation The DECS-150 can be used to control the excitation level of two or more generators operating in parallel so that the generators share the reactive load. The DECS-150 can employ either droop compensation or cross-current compensation (reactive differential) schemes for reactive load sharing.
  • Page 27 Mismatch Delay setting adds a delay before the element becomes true. A Load Share ID setting identifies the DECS-150 as a load sharing unit in the network. Checking a Load Sharing Unit number box allows any DECS-150 load sharing units on the network with that Load Share ID number to share load with the currently connected DECS-150.
  • Page 28 (style xxxxxxx2). The Auto Tracking screen is illustrated in Figure 5-5. Internal Setpoint Tracking In applications using a single DECS-150, internal tracking can be enabled so that the inactive regulation modes track the active regulation mode. The following examples demonstrate the advantages of internal tracking: If the excitation system is operating online with internal tracking enabled, a loss of sensing •...
  • Page 29 Like internal tracking, external setpoint tracking uses enable/disable, delay, and traverse rate settings. Tracking Comms Loss Alarm An alarm can be configured to annunciate when the DECS-150 is configured as the secondary DECS-150 and has lost tracking communications from the primary DECS-150.
  • Page 30 The Band setting defines the window in which the machine voltage must be for voltage matching to occur. The Gen/Motor to Bus PT Match Level setting is provided to compensate for step-up or step-down transformers in the system. The DECS-150 adjusts the sensed machine voltage by this percentage. The Voltage Matching screen is illustrated in Figure 5-7.

  • Page 31: Auxiliary Control

    Minimum and maximum setpoint limits are observed when the With Limit box is checked. Auxiliary Control Gains When a current input type is selected, the input current is converted internally by the DECS-150 into a voltage signal in the range of –10 to +10 Vdc. The DECS-150 uses Equation 6-1 when converting the applied current into a voltage.
  • Page 32 The auxiliary control signal can be configured to control the inner or outer regulation control loop. Selecting the inner loop limits auxiliary control to AVR and FCR modes. Selecting the outer loop limits auxiliary control to PF and Var modes. Auxiliary Control DECS-150...

  • Page 33: Contact Inputs And Outputs

    Contact Inputs BESTCOMSPlus Navigation Path: Settings Explorer, Programmable Inputs, Contact Inputs Eight programmable contact inputs are provided for initiating DECS-150 actions. All inputs have pre- assigned default logic. Refer to the BESTlogic™Plus section for contact input assignments. All contact inputs are compatible with dry relay/switch contacts. Each contact input has an interrogation voltage and current of 12 Vdc at 1.2 mAdc.
  • Page 34 During normal operating conditions, the WD3 contact is closed and the WD1 contact is open. Programmable Outputs The two programmable, normally-open contact outputs can be configured to annunciate DECS-150 status, active alarms, active protection functions, and active limiter functions. Using BESTlogicPlus programmable logic, these outputs can be used as part of a user-configured logic scheme to control and annunciate a variety of system conditions and contingencies.

  • Page 35: Protection

    9492600990 8 • Protection The DECS-150 offers protection relating to machine voltage, frequency, field parameters, rotating exciter diodes, and sync check over synchronism. Configurable protection elements supplement this protection with additional, user-defined system parameters that have multiple pickup thresholds per parameter. Most protection functions have two groups of settings labeled Primary and Secondary.
  • Page 36 The machine voltage is monitored for a loss of sensing (LOS) condition. In the DECS-150, a loss of sensing event is calculated using sequence components. A loss of sensing event occurs when the positive sequence voltage (V1) drops below the Voltage Balanced Level setting of the AVR setpoint, or when the negative sequence voltage (V2) increases above the Voltage Unbalanced Level setting of the positive sequence voltage.
  • Page 37 Overfrequency pickup and trip elements in BESTlogicPlus can be used in a logic scheme to initiate corrective action in response to the condition. The Overfrequency screen is illustrated in Figure 8-4. Shutdown Enable When checked, Shutdown Enable causes the DECS-150 to stop excitation when the overfrequency element trips. DECS-150 Protection...
  • Page 38 When checked, Shutdown Enable causes the DECS-150 to stop excitation when the underfrequency element trips. Field Protection BESTCOMSPlus Navigation Path: Settings Explorer, Protection, Field Field protection provided by the DECS-150 includes exciter field current limit, field overvoltage, and an exciter diode monitor. Protection DECS-150...
  • Page 39 9492600990 Exciter Field Current Limit When checked, Shutdown Enable causes the DECS-150 to shut down excitation when the field current is too high (approximately 23 A), which could result in damage to the regulator. A restart is required to begin regulating again.
  • Page 40 25 status logic output asserts. This logic output can be configured (in BESTlogicPlus) to assert a DECS-150 contact output. This contact output can, in turn, enable the closure of a breaker tying the generator to the bus.
  • Page 41 The DECS-150 has eight configurable protection elements which can be used to supplement the standard DECS-150 protection. To make the protection elements easier to identify, each element can be given a user-assigned name of up to 16 alphanumeric characters. A protection element is configured by selecting the parameter to be monitored and then establishing the operating characteristics for the element.
  • Page 42 Using an out-of-limits threshold will prevent the protection element from functioning. An activation delay serves to delay a protective trip after the threshold (pickup) level is exceeded. The Configurable Protection #1 screen is illustrated in Figure 8-10. Figure 8-10. Configurable Protection #1 Screen Protection DECS-150...

  • Page 43: Limiters

    Otherwise, only the Medium-Level and Low-Level settings are enabled. OEL Shutdown When this setting is enabled and the OEL limiter is active, the DECS-150 will shut down after the Shutdown Delay time expires. Figure 9-1. OEL Configure Screen...
  • Page 44 The offline, high-level OEL threshold is determined by the High Level and High Time settings. When the excitation level exceeds the High Level setting, the DECS-150 acts to limit the excitation to the value of the High-Level setting and a High Level Timer is initiated. If this level of excitation persists until this timer reaches the High Time setting, the DECS-150 acts to limit the excitation to the value of the Low-Level setting.
  • Page 45 When the excitation level exceeds the Low Level setting for the duration of the high and medium time settings, the DECS-150 acts to limit the excitation to the value of the Low Level setting. The Ambient Temperature setting on the Rated Data Settings screen determines the low-level range.
  • Page 46 , a plot of the takeover OEL setting curves is displayed. Settings enable selection of ® the displayed curves. The plot can display the primary or secondary setting curves, the offline or online settings curves, and the pickup or reset settings curves. Limiters DECS-150...
  • Page 47 UEL operates in all regulation modes. UEL behavior in manual mode can be configured to limit excitation or issue an alarm. This behavior is configured in BESTlogicPlus. Note For UEL to operate, the PARALLEL_ENABLE_LM logic block must be set true in BESTlogicPlus programmable logic. DECS-150 Limiters...
  • Page 48 UEL Shutdown When this setting is enabled and the UEL limiter is active, the DECS-150 will shut down after the shutdown delay time expires.
  • Page 49 Excessive stator current with lagging power factor calls for reduced excitation. The SCL can be enabled in all regulation modes. When operating in Manual mode, the DECS-150 will announce high stator current but will not act to limit it. Primary and secondary SCL setting groups provide additional control for two distinct machine operating conditions.
  • Page 50 High Level setting and a High Level Timer is initiated. If this level of current persists until this timer reaches the High Level Time setting, the DECS-150 acts to limit the current to the value of the Low Level SCL setting.
  • Page 51 If the machine frequency decreases below the corner frequency for the selected underfrequency slope (Figure 9-11), the DECS-150 adjusts the voltage setpoint so that the machine voltage follows the underfrequency slope. The adjustment range of the corner frequency and slope settings enables the DECS-150 to precisely match the operating characteristics of the prime mover and the loads being applied to the machine.
  • Page 52 Figure 9-12. Typical 1.1 PU Volts per Hertz Limiter Curve Underfrequency and volts per hertz limiter settings are illustrated in Figure 9-13. Figure 9-13. Underfrequency Screen Underfrequency Volts/Hz Disable When true, the UNDERFREQUENCY_VHZ_DISABLE logic block disables the Volts/Hz limiter. Refer to the BESTlogicPlus section for more information. Limiters DECS-150...

  • Page 53: Grid Code

    The Low Frequency region in Figure 10-1 is defined by two settings: Min Frequency for Disconnect and Min Frequency for Continuous Operation. When grid frequency is within the range defined by these two settings, the Frequency Disconnect timer is active. DECS-150 Grid Code...
  • Page 54 Note Rather than performing the disconnection, the DECS-150 issues a logic indication which can be used to energize a physical output. See the BESTlogic™Plus section for details on the GCC Disconnected status input.
  • Page 55 HMI Navigation Path: Settings, Operating Settings, Grid Code Settings, Active Power Control The DECS-150 runs in Active Power Control mode continuously when grid frequency is normal (within the dead band). It shifts into Limited Frequency Sensitive Mode (LFSM) when grid frequency is outside the dead band.
  • Page 56 Auxiliary Input To use the DECS-150 auxiliary input as the grid code Active Power Control adjustment source, make the following settings: On the Auxiliary Input screen, set the Input Function setting to Grid Code Input. Refer to the •...
  • Page 57 Grid Recovery Settings The Recovery Time setting establishes the amount of time the grid frequency must remain within the dead band before the grid is deemed stable and the DECS-150 can return to Active Power Control mode. DECS-150 Grid Code...
  • Page 58 When in Power Factor mode, the time can take up to 60 seconds for settling into the 5% tolerance band. The Vbus Time Constant setting establishes the time constant for the low-pass filter on the bus voltage measurement. Grid Code DECS-150...
  • Page 59 The Mode Selection setting establishes the active LVRT reactive power control mode. When an input on the LVRT_MODE_SELECT logic element is held true, the corresponding LVRT reactive power control mode becomes the active mode, overriding the mode specified by the Mode Selection setting. DECS-150 Grid Code...
  • Page 60 The operating setpoint is typically a fixed value but may be remotely adjusted in steps of 0.5% U . Such adjustment results in a horizontal shift of the characteristic (see Figure 10-8). The ability to remotely modify the setpoint is specified by the network operator at the time of system planning. Grid Code DECS-150...
  • Page 61 Reactive Power control modes instead. Adjustment Sources The Q(U) setpoint may be adjusted by the DECS-150 auxiliary input or via remote communication (Modbus ). For all adjustment sources, the value of the Q(U) Gain setting is applied to the value read ®...
  • Page 62 Figure 10-10, below. Above 20% active power, the reactive power range should be -0.33 to 0.33 per unit reactive power. Figure 10-10. Q(P) Characteristic Curve Figure 10-11 illustrates an example characteristic with five plotted points. Grid Code DECS-150...
  • Page 63 BESTlogicPlus section for details. Figure 10-12. LVRT Mode Select Logic Element If LVRT Mode is enabled, but no operating mode is specified, the default operating mode will be Power Factor with a power factor setting of 1.0. DECS-150 Grid Code...
  • Page 64 Figure 10-14. This is accomplished by imposing voltage dependent limits on the reactive power output that can be achieved. Grid Code DECS-150...
  • Page 65 The network operator specifies the four points when the installation is planned. Unless specified by the network operator, the following value pairs apply: P1 (0.94; 0.33), P2 (0.96;0), P3( 1.04; 0), P4 (1.06, -0.33) An example characteristic is shown in Figure 10-15. DECS-150 Grid Code...
  • Page 66 After modification of the value (Qref/Pb inst), the machine output must achieve the specified output level within a maximum of four minutes. Adjustment Sources The Q(Voltage Limit) setpoint may be adjusted by the DECS-150 auxiliary input or via remote communication (Modbus ). For all adjustment sources, the value of the Q(Voltage Limit) Gain setting is ®...
  • Page 67 2% for plants with less than 2 MW output and 4% for plants with greater than 4 MW output. Q(PF) Adjustment. In the DECS-150, power factor is defined such that it is positive when reactive power is exported and negative when reactive power is imported. When PF = 1.0, or -1.0, the power is pure real power so Reactive Power = 0.
  • Page 68 Figure 10-19. Power Factor: Negative Adjustment Sources The Q(PF) setpoint may be adjusted by the DECS-150 auxiliary input, or via remote communication (Modbus ). For all adjustment sources, the value of the Q(PF) Gain setting is applied to the value read ®...
  • Page 69 9492600990 10-17 Auxiliary Input To use the DECS-150 auxiliary input as the Q(PF) adjustment source, make the following settings: On the Auxiliary Input screen, set the Input Function setting to Grid Code Input. Refer to the • Auxiliary Control section for details.
  • Page 70 In modes Q(U), Q(Voltage Limit), Q(PF), and Q(Third Party), the Adjust Source setting allows selection of the adjustment source. The selections are: None, Auxiliary Input, or Modbus. A Gain setting specifies the gain to be applied to the DECS-150 auxiliary analog input value to achieve the desired adjustment value.
  • Page 71 The duration of the grid code test is established by the Max Time For Testing setting. This timer begins when the Send to Device button is clicked. When the timer expires, the frequency and voltage biases are no longer applied. Figure 10-22. Grid Code Test Screen DECS-150 Grid Code...
  • Page 72 10-20 9492600990 Grid Code DECS-150...

  • Page 73: Metering

    9492600990 11-1 11 • Metering The DECS-150 provides comprehensive metering of internal and system conditions. These capabilities include extensive parameter metering, status indication, reporting, and real-time metering analysis. ® BESTCOMSPlus Metering Explorer DECS-150 metering is accessed through the BESTCOMSPlus metering explorer. The metering explorer ®...
  • Page 74 11-2 9492600990 Metered Parameters DECS-150 metering categories include generator/motor, power, bus, field, power system stabilizer (PSS), and generator synchronization parameters. Generator/Motor BESTCOMSPlus Navigation Path: Metering Explorer, Generator/Motor Metered machine parameters include the voltage (magnitude and angle), current (magnitude and angle), and frequency.
  • Page 75 The level of excitation power supplied to the field is displayed as a percentage, with 0% being the minimum and 100% being the maximum. Primary- and per-unit values are available. Figure 11-6 illustrates the field primary-values metering screen. DECS-150 Metering...
  • Page 76 Auxiliary Control Input BESTCOMSPlus Navigation Path: Metering Explorer, Aux Input The control signal applied at the DECS-150 auxiliary control input is indicated on the Aux Input metering screen (Figure 11-9). As configured in BESTCOMSPlus , a dc voltage or dc current signal may be ®...
  • Page 77 Alarm status, PSS status, Null Balance status, and Grid Code Mode. Figure 11-11. Control Panel Start/Stop Mode: Two indicators show the start/stop mode of the DECS-150. When a mode is active, its corresponding indicator changes from gray to green. To select the DECS-150 Start status, click the Start button.
  • Page 78 BESTCOMSPlus Navigation Path: Metering Explorer, Summary All of the metering values displayed on the individual, previously-described metering screens are consolidated on the metering summary screen. Primary- and per-unit values are available. Figure 11-12 illustrates the primary-values metering summary screen. Metering DECS-150...
  • Page 79 11-7 Figure 11-12. Metering Summary Screen Status Indication Status indication is provided for DECS-150 system functions, inputs, outputs, network load share, grid code, configurable protection, alarms, and the real-time clock. System Status BESTCOMSPlus Navigation Path: Metering Explorer, Status, System Status When any of the system functions illustrated in Figure 11-13 are active, the corresponding indicator changes from gray to green.
  • Page 80 Outputs BESTCOMSPlus Navigation Path: Metering Explorer, Status, Outputs Status indication for the DECS-150’s Watchdog, Breaker Shunt Trip, and two contact outputs is provided on the BESTCOMSPlus contact outputs status screen illustrated in Figure 11-15. An indicator changes from gray to green when the corresponding output changes state (Watchdog output) or closes (Outputs 1 and 2).
  • Page 81 9492600990 11-9 Figure 11-15. DECS-150 Contact Outputs Status Indication Screen Network Load Share The screen shown in Figure 11-16 reports the error percent, reactive current, NLS average reactive current, and number of generators online. The status indicators change from gray to green when a status is active.
  • Page 82 Active and previously latched alarms are listed on the Alarms screen of BESTCOMSPlus. A Reset Alarms button on the Alarms screen is clicked to clear all inactive alarms in BESTCOMSPlus. The BESTCOMSPlus Alarms screen is illustrated in Figure 11-19. All possible DECS-150 alarms are listed below.
  • Page 83 9492600990 11-11 Figure 11-19. DECS-150 Alarm Annunciation and Reset Screen 27P Trip Ethernet Link Lost 59P Trip Exciter Field Current Limit 81O Trip Field Overvoltage Trip 81U Trip Firmware Change APC Bridge Active GCC Disconnect Timed Out APC Output Limit...
  • Page 84 Disabled, Latching, or Non-Latching. Latching alarms are stored in nonvolatile memory and are retained even when operating power to the DECS-150 is lost. Active alarms are shown on the front panel and in BESTCOMSPlus until they are cleared. Non-latching alarms are cleared when operating power is removed.
  • Page 85 The DECS-150 time and date is displayed and adjusted on the BESTCOMSPlus Real-Time Clock screen (Figure 11-22). Manual adjustment of the DECS-150 clock is made by clicking the Edit button. This displays a window where the DECS-150 time and date can be adjusted manually or according to the connected PC clock’s date and time.
  • Page 86 Found under the Tools menu, the auto export metering function is an automated method for saving multiple metering data files at specific intervals over a period of time while connected to a DECS-150. The user specifies the Number of Exports and the Interval between each export. Enter a base filename for the metering data and a folder in which to save.

  • Page 87: Reports

    Any one of over 400 monitored data/status points can be recorded in a sequence-of-events record. All points are enabled by default. If an active connection to a DECS-150 is present, the sequence of events will automatically download. Using the Options button, you can copy, print, or save the sequence of events. The Refresh button is used to refresh/update the list of events.
  • Page 88 Data logging may be triggered by mode change, logic change, level changes, or manually through BESTCOMSPlus. Mode Triggers Mode triggers initiate data logging as a result of an internal or external DECS-150 status change. The Mode Triggers screen is illustrated in Figure 12-3. Figure 12-3. Mode Triggers Screen Level Triggers Level triggering initiates a data log based on the value of an internal variable.
  • Page 89 Generator/Motor voltage Vca SCL ref. • • Negative sequence current • • SCL state Negative sequence voltage Terminal frequency deviation • • Null balance level Time response signal • • OEL controller output UEL controller output • • DECS-150 Reports...
  • Page 90 Click the Print Summary button to open the Print Preview screen and view or print a summary of the selected data log. Click the Print Record button to open the Print Preview screen and view or print the full details of the selected data log. Reports DECS-150...
  • Page 91 9492600990 12-5 Figure 12-6. Data Log Screen DECS-150 Reports...
  • Page 92 12-6 9492600990 Reports DECS-150...

  • Page 93: Power System Stabilizer

    PSS function is illustrated by the function blocks and software switches shown in Figure 13-1. This illustration is also available in BESTCOMSPlus by clicking the PSS Model Info button located on the Control tab. DECS-150 Power System Stabilizer...
  • Page 94 13-2 9492600990 Figure 13-1. PSS Function Blocks and Software Switches Power System Stabilizer DECS-150...
  • Page 95 However, this may not be the case during low frequency transients, due to the voltage drop across the machine reactance. To compensate for this effect, the DECS-150 first calculates the terminal voltages and currents. It then adds the voltage drop across the quadrature reactance to the terminal voltages to obtain internal machine voltages.
  • Page 96 SSW 2 setting is Frequency and the SSW 3 setting is Derived Frequency/Speed. Washed out power is selected as the stabilizing signal when the SSW 3 setting is Power. When the SSW 3 setting is Power, the SSW 2 setting has no effect. Power System Stabilizer DECS-150...
  • Page 97 The output of the phase compensation stages is connected, through a stabilizer gain stage, to the washout filter and logic limiter. Software switch SSW 9 enables and bypasses the washout filter and logic limiter. The washout filter has two time constants: Normal and Limit (less than normal). DECS-150 Power System Stabilizer...
  • Page 98 Since the PSS operates by modulating the excitation, it may counteract the voltage regulator’s attempts to maintain terminal voltage within a tolerance band. To avoid creating an overvoltage condition, the PSS has a terminal voltage limiter (shown in Figure 13-8) that reduces the upper output limit to zero when the Power System Stabilizer DECS-150...
  • Page 99 The low-pass filter is controlled by a time constant. Operational Settings PSS settings are configured exclusively through the BESTCOMSPlus interface. These settings are ® illustrated in Figure 13-10 through Figure 13-13. Figure 13-10. PSS Configure Screen Figure 13-11. PSS Control Screen DECS-150 Power System Stabilizer...
  • Page 100 13-8 9492600990 Figure 13-12. PSS Parameter Screen Power System Stabilizer DECS-150...
  • Page 101 9492600990 13-9 Figure 13-13. PSS Output Limiter Screen DECS-150 Power System Stabilizer...
  • Page 102 13-10 9492600990 Power System Stabilizer DECS-150...

  • Page 103: Stability Tuning

    Proportional, Integral, Derivative. The word proportional indicates that the response of the DECS-150 output is proportional or relative to the difference of change observed. Integral means that the DECS-150 output is proportional to the amount of time that a difference is observed. Integral action eliminates offset.
  • Page 104 Upon completion of stability tuning, undesired records can be removed from the record list. Caution Calculated or user-defined PID values are to be implemented only after their suitability for the application has been verified by the user. Incorrect PID numbers can result in poor system performance or equipment damage. Stability Tuning DECS-150...
  • Page 105 PID values calculated by the Auto Tuning function are to be implemented only after their suitability for the application has been verified by the user. Incorrect PID numbers can result in poor system performance or equipment damage. DECS-150 Stability Tuning...
  • Page 106 BESTCOMSPlus FCR stability settings are illustrated in Figure 14-4. FCR Mode Stability Settings The DECS-150 bases its field current output upon the following settings. The proportional gain (K ) is multiplied by the error between the field current setpoint and the actual field current value.
  • Page 107 BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Gain, var, PF, OEL, UEL, SCL, VAR Limiter Settings for stability tuning of the Var and Power Factor modes are provided in the DECS-150 along with settings for stability tuning of limiters, the voltage matching function, and main field voltage response.
  • Page 108 14-6 9492600990 Voltage Matching The integral gain (K ) adjusts the rate at which the DECS-150 matches the machine voltage to the bus voltage. Figure 14-5. Var, PF, OEL, UEL, SCL Screen Stability Tuning DECS-150...

  • Page 109: Mounting

    Supplied mounting hardware consists of six #12 thread-forming screws. The screws pass through mounting holes in the conduit box and thread into the plastic shell of the DECS-150. The screws are equipped with O-ring seals. The recommended torque for the steel mounting screws is 3.95 newton- meters (35 inch-pounds).
  • Page 110 15-2 9492600990 Figure 15-2. Cutout and Drilling Dimensions Mounting DECS-150...

  • Page 111: Terminals And Connectors

    150 terminals consist of single-row, multiple-pin headers that mate with removable connectors wired by the user. The USB port is located on the front or rear panel as specified by the DECS-150 style number. The USB port and Ethernet port are described in the Communications section.
  • Page 112 This output provides an electronic switch capable of 100 mAdc that can be used to control an external circuit breaker. External Tracking Inputs (GND, C2L, C2H) A second DECS-150 connects to these terminals for the purpose of setpoint tracking. For more information, refer to the Regulation section. Terminals and Connectors...
  • Page 113 9492600990 16-3 Figure 16-1. DECS-150 Terminals DECS-150 Terminals and Connectors...
  • Page 114 16-4 9492600990 Terminals and Connectors DECS-150...

  • Page 115: Typical Connections

    17-1 17 • Typical Connections Typical connection diagrams are provided in this section as a guide when wiring the DECS-150 for communication, contact inputs, contact outputs, sensing, and operating power. Typical connections for shunt powered generator applications are shown in Figure 17-1. Typical connections for PMG powered generator applications are shown in Figure 17-2.
  • Page 116 17-2 9492600990 Figure 17-1. Typical DECS-150 Connections for Shunt Powered Generator Applications Typical Connections DECS-150...
  • Page 117 9492600990 17-3 Figure 17-2. Typical DECS-150 Connections for PMG Powered Generator Applications DECS-150 Typical Connections...
  • Page 118 17-4 9492600990 Figure 17-3. Typical DECS-150 Connections for Station Powered Generator Applications Typical Connections DECS-150...
  • Page 119 9492600990 17-5 Figure 17-4. Typical DECS-150 Connections for Station Powered Motor Applications DECS-150 Typical Connections...
  • Page 120 17-6 9492600990 Typical Connections DECS-150...

  • Page 121: Bestcomsplus ® Software

    DECS-150 is brought into BESTCOMSPlus by downloading settings and logic from the DECS-150. This gives the user the option of developing a custom setting file by modifying the default logic scheme or by building a unique scheme from scratch.
  • Page 122 BESTCOMSPlus when clicked. Powering the DECS-150 through the USB Port The DECS-150 can be partially powered from the USB port when no input power is applied. The following capabilities are functional in this mode: The settings interface will operate as expected.
  • Page 123 BESTCOMSPlus. Manual activation is useful if you want to create a settings file prior to receiving your digital excitation system. Note that if a DECS-150 is not connected, you will not be able to configure certain Ethernet settings. Ethernet settings can be changed only when an active USB or Ethernet connection is present.
  • Page 124 Manual Activation of the DECS-150 Plugin Manual activation of the DECS-150 plugin is required only if the initial use of BESTCOMSPlus will be on a PC that is not connected to a DECS-150. Manual activation is described in the following paragraphs.
  • Page 125 Select DECS-150 from the Device pull-down menu. Enter your Email Address and Activation Key provided by Basler Electric. If you received an email containing the Activation Key, you can select all of the text in the email and copy it to the Windows clipboard using normal Windows techniques. The Get Data button extracts the Device, Email Address, and Activation Key from the Windows clipboard and pastes it into the appropriate fields.
  • Page 126 Recent Files Open a previously opened file Exit Close BESTCOMSPlus program Communication New Connection Choose new device or DECS-150 Close Connection Close communication between BESTCOMSPlus and DECS-150 Download Settings and Logic from Device Download operational and logic settings from the...
  • Page 127 Mode. Click on this button after making a setting change to send the modified setting to the DECS-150. Settings Explorer The BESTCOMSPlus settings explorer is used to navigate through the settings screens of the DECS-150 plugin. Descriptions of these configuration settings are organized as follows: •...
  • Page 128 Right-clicking the hyperlinked setting name will restore the setting to its default value. Note It is possible to save a DECS-150 settings file in BESTCOMSPlus with noncompliant settings. However, it is not possible to upload noncompliant settings to the DECS-150.
  • Page 129 Upload Settings and/or Logic to Device To upload a settings file to the DECS-150, open the file or create a new file through BESTCOMSPlus. Then pull down the Communication menu and select Upload Settings and Logic to Device. If you want to upload operational settings without logic, select Upload Settings to Device.
  • Page 130 Compare dialog box (Figure 18-8) is displayed where you can view all settings (Show All Settings), view only the differences (Show Settings Differences), view all logic (Show All Logic Paths), or view only logic differences (Show Logic Path Differences). Select Close when finished. Figure 18-8. BESTCOMSPlus ® Settings Compare BESTCOMSPlus ® Software DECS-150...
  • Page 131 18-11 Firmware Updates Future enhancements to DECS-150 functionality will require a firmware update. Because default settings are loaded when DECS-150 firmware is updated, your settings should be saved in a file prior to upgrading firmware. Warning! Before performing any maintenance procedures, remove the DECS- 150 from service.
  • Page 132 General Settings > Style Number in BESTCOMSPlus. If the style number of the settings file does not match that of the DECS-150 into which it is to be loaded, disconnect from the DECS-150, then modify the style number in the settings file.
  • Page 133 Updates Enhancements to DECS-150 firmware typically coincide with enhancements to the DECS-150 plugin for BESTCOMSPlus. When a DECS-150 is updated with the latest version of firmware, the latest version of BESTCOMSPlus should also be obtained. If you obtained a CD-ROM containing a firmware update from Basler Electric, then that CD-ROM •...
  • Page 134 18-14 9492600990 BESTCOMSPlus ® Software DECS-150...

  • Page 135: Bestlogic™Plus

    ® a logic scheme that was previously saved as a file and upload it to the DECS-150. The default logic schemes can also be customized to suit your application. Detailed information about logic schemes is provided later in this section.
  • Page 136 Description Symbol Input Objects Logic 0 Always false (Low). Logic 1 Always true (High). Physical Inputs IN1 - IN8 True when Physical Input x is active. Virtual Inputs VIN1 - VIN6 True when Virtual Input x is active. BESTlogic™Plus DECS-150...
  • Page 137 The Remote Control Failure Timer is always active and resets frequently, during good communications. APC Remote True when the Remote Control Failure Timer Comm Fail has expired for any communication protocol (defined by the Adjust Source setting). DECS-150 BESTlogic™Plus...
  • Page 138 True when any Grid Code disconnection Timed Out timer has expired. Remains true until the GCC reconnect timer becomes active. True when disconnection criteria for GCC Disconnected has been met and remains true until the GCC reconnect timer expires. BESTlogic™Plus DECS-150...
  • Page 139 True when LFSM is enabled. LFSM Normal True when LFSM is enabled and grid Operation frequency is within the dead band. LFSM True when LFSM is enabled and grid Overfrequency frequency is greater than the LFSM-O Dead Active Band setting value. DECS-150 BESTlogic™Plus...
  • Page 140 True when any of the load sharing enabled Share ID Missing units are not detected on the network. Network Load True when data is being received from a Share Receiving specific unit on the load share network. ID 1-16 BESTlogic™Plus DECS-150...
  • Page 141 PSS Speed Failed True when the frequency is out of range for a (Optional) length of time calculated internally by the DECS-150 and the PSS is active. PSS Test On True when the power system stabilizer test (Optional) signal (Frequency Response) is active.
  • Page 142 Soft Start Active True during softstart. Start Status True when the unit is in Start mode. Tracking Comms True when the DECS-150 is configured as Loss the secondary DECS-150 and has lost tracking communications from the primary DECS-150. True when the Under Excitation Limiter is active.
  • Page 143 Logic Gates Input Output NAND Input Output Input Output Input Output Input Output XNOR Input Output Input Output (INVERTER) Rising Edge The output is true when the rising edge of a pulse is detected on the input signal. DECS-150 BESTlogic™Plus...
  • Page 144 BESTlogicPlus Programmable Logic, Logic Counters. Elements Table 19-3 lists the names and descriptions of the elements in the Elements group. Table 19-3. Elements Group, Names and Descriptions Name Description Symbol When true, this element blocks, or disables, the 27 undervoltage protection function. BESTlogic™Plus DECS-150...
  • Page 145 If used for alarm, the user's text is what will appear in the event log. Cross Current When true, this element disables cross current Compensation compensation. Disable Custom LED When true, this element sets the Custom Alarm on the front panel. DECS-150 BESTlogic™Plus...
  • Page 146 COMM FAIL status input to freeze LVRT output when remote communication fails. Grid Code Disable When true, overall Grid Code functionality is disabled. Internal Tracking When true, this element disables internal Disable tracking. LFSM Disable When true, Grid Code LFSM is disabled BESTlogic™Plus DECS-150...
  • Page 147 This element allows load sharing with specific units on the network to be disabled. When an input to this block is true, load share data received from that unit is ignored by the DECS-150. Loss of Sensing When true, this element disables the transfer Transfer Disable to Manual mode during a Loss of Sensing condition.
  • Page 148 OEL Disabled in When true, this element disables OEL when Manual Mode the unit is operating in Manual mode. OEL Online When true, this element enables the use of OEL when the unit is considered online. BESTlogic™Plus DECS-150...
  • Page 149 PSS Select When true, this element selects secondary Secondary Settings settings for the PSS. (Available when the controller is equipped with the optional Power System Stabilizer, style number xPxxx.) Raise Enable When true, this element raises the active setpoint. DECS-150 BESTlogic™Plus...
  • Page 150 The var input selects var control and the PF input selects power factor control. Var/PF Selection When true, this element allows the selection Enable of var and PF. Voltage Matching When true, this element disables voltage Disable matching when the unit is operating in AVR mode. BESTlogic™Plus DECS-150...
  • Page 151 The Active Logic Scheme The DECS-150 must have an active logic scheme in order to function. All DECS-150 controllers are delivered with a default, active logic scheme preloaded in memory. The logic scheme is tailored for a system with the PSS option disabled or enabled depending on the PSS option selected in the system style number.
  • Page 152 19-18 9492600990 Default Logic Schemes The default logic scheme for PSS-disabled systems is shown in Figure 19-2 and the default logic scheme for PSS-enabled systems is shown in Figure 19-3. Figure 19-2. PSS-Disabled Default Logic BESTlogic™Plus DECS-150...
  • Page 153 Use BESTCOMSPlus to program BESTlogicPlus. Using BESTlogicPlus is analogous to physically ® attaching wire between discrete DECS-150 terminals. To program BESTlogicPlus, use the Settings Explorer within BESTCOMSPlus to open the BESTlogicPlus Programmable Logic tree branch as shown in Figure 19-1.
  • Page 154 19-20 9492600990 The following conditions must be met before BESTCOMSPlus will allow logic to be uploaded to the DECS-150: A minimum of two inputs and a maximum of 32 inputs on any multi-port (AND, OR, NAND, NOR, • XOR, and XNOR) gate.
  • Page 155 To manage BESTlogicPlus files, use the Settings Explorer to open the BESTlogicPlus Programmable Logic tree branch. Use the BESTlogicPlus Programmable Logic toolbar to manage BESTlogicPlus files. Refer to Figure 19-6. For information on Settings Files management, refer to the BESTCOMSPlus Software section. DECS-150 BESTlogic™Plus...
  • Page 156 After programming BESTlogicPlus settings, click on the Save button to save the settings to memory. Before the new BESTlogicPlus settings can be uploaded to the DECS-150, you must select Save from the File pull-down menu located at the top of the BESTCOMSPlus main shell. This step will save both the BESTlogicPlus settings and the operating settings to a file.
  • Page 157 Figure 19-7. Example 1 - PREPOSITION_1_ENABLE Logic Block Connections Example 2 - AND Gate Connections Figure 19-8 illustrates a typical AND gate connection. In this example, Output 2 will become active when Inputs 7 and 8 are true. Figure 19-8. Example 2 - AND Gate Connections DECS-150 BESTlogic™Plus...
  • Page 158 19-24 9492600990 BESTlogic™Plus DECS-150...

  • Page 159: Communication

    PC or laptop, the DECS-150 must be properly tied to ground. Powering the DECS-150 through the USB Port The DECS-150 can be partially powered from the USB port when no input power is applied. The following capabilities are functional in this mode: The settings interface will operate as expected.
  • Page 160 Configure Ethernet Port screen shown in Figure 20-2 will appear. Figure 20-2. Configure Ethernet Port DHCP (Dynamic Host Configuration Protocol) is enabled by default and allows the DECS-150 to send a broadcast request for configuration information. The DHCP server receives the request and responds with configuration information.
  • Page 161 192.168.0.0 - 192.168.255.255 • If the DECS-150 is operating on an isolated network, the Subnet Mask can be left at 0.0.0.0 and the Default Gateway can be chosen as any valid IP address from the same range as the DECS-150 IP address.
  • Page 162 20-4 9492600990 If you know the IP address of the DECS-150, click the radio button for the Ethernet Connection IP at the top of the DECS-150 Connection window, enter the address into the fields and click the Connect button. If you don’t know the IP address, you can perform a scan to search for all connected devices by clicking the Ethernet button in the Device Discovery box.
  • Page 163 The PC running BESTCOMSPlus software must be configured correctly to communicate with the DECS-150. The PC must have an IP address in the same subnet range as the DECS-150 if the DECS-150 is operating on a private, local network. Otherwise, the PC must have a valid IP address with access to the network and the DECS-150 must be connected to a properly configured router.
  • Page 164 20-6 9492600990 Communication DECS-150...

  • Page 165: Configuration

    Required field ratings include the no-load dc voltage and current and full-load voltage and current. In applications where the generator will be paralleled with a bus, the DECS-150 must be configured with the rated bus voltage.
  • Page 166 Voltage settings for the machine PT primary and secondary windings establish the nominal PT voltages expected by the DECS-150. ABC or ACB phase rotation can be accommodated. Options for the machine voltage sensing connections include single-phase (across phases C and A) and three-phase sensing using three-wire delta connections.
  • Page 167 BESTlogic™Plus. The PWM Startup Duty Cycle setting gives the user the ability to adjust the initial startup pulse width of the DECS-150’s output to the field of the machine during the soft start sequence. Figure 21-4. Startup Screen...
  • Page 168 Display Units BESTCOMSPlus Navigation Path: General Settings, Display Units When working with DECS-150 settings in BESTCOMSPlus, you have the option of viewing the settings in English or Metric units. The Display Units settings are illustrated in Figure 21-6. Figure 21-6. Display Units...

  • Page 169: Security

    22-1 22 • Security DECS-150 security is provided in the form of passwords, which control the type of operations allowed by a particular user. Passwords can be tailored to provide access to specific operations. Additional security is available by controlling the type of operations allowed through certain DECS-150 communication ports.
  • Page 170 An additional dimension of security is provided by the ability to restrict the control available through the DECS-150 communication ports. At any given time, only one port can be in use with read or higher access. For example, if a user gains settings access at one port, users at other ports will be able to gain no higher than read access until the user with settings access logs off.
  • Page 171 The Login Attempts setting limits the number of times that login can be attempted. The Login Time Window setting limits the length of time permitted during the login process. If login is unsuccessful, access is blocked for the duration of the login Lockout Time setting. Figure 22-3. Access Control Screen DECS-150 Security...
  • Page 172 22-4 9492600990 Security DECS-150...

  • Page 173: Timekeeping

    Backup Battery for the Real-Time Clock The backup battery for the real time clock is a standard feature of the DECS-150. A battery is used to maintain clock function during loss of operating power. In mobile substation and other applications, the...
  • Page 174 The time must be reset after replacing the battery. Time settings such as 12/24 hour format are not affected. Battery Replacement Procedure The battery access is located on the back of the DECS-150. See the Terminals and Connectors section for battery location. Step 1: Remove the DECS-150 from service.

  • Page 175: Testing

    9492600990 24-1 24 • Testing Testing of the DECS-150’s regulation and optional power system stabilizer (style xPxxx) performance is possible through the integrated analysis tools of BESTCOMSPlus ® Real-Time Metering Analysis BESTCOMSPlus Navigation Path: Metering Explorer, Analysis Proper voltage regulator performance is critical to power system stabilizer performance. Step response measurements of the voltage regulator should be performed to confirm the AVR gain and other critical parameters.
  • Page 176 Mechanical power (x7) Var/PF state • • Mechanical power (x8) Var/PF output • • Mechanical power (x9) Washed out power (WashP) • • Negative sequence current (I2) Washed out speed (WashW) • • Negative sequence voltage (V2) • Testing DECS-150...
  • Page 177 A Bode plot can be printed, opened, and saved in graph (.gph) format. Test Signal Location The point in the DECS-150 logic circuitry where a signal is injected for analysis of magnitude and phase responses is selectable. Signal points include AVR Summing Point, PID Block Output, AVR PID Input, PSS Compensation Frequency, PSS Electric Power, and Manual PID Input.
  • Page 178 If such components are present, it indicates that the frequency compensation is less than ideal, or that the machine inertia value is incorrect. Testing DECS-150...
  • Page 179 Sweep Type A Swept Sine test signal can be configured as linear or logarithmic. Start and Stop Frequencies The range of a Swept Sine test signal is determined by Start Frequency and Stop Frequency settings. DECS-150 Testing...
  • Page 180 If logging is in progress, another log cannot be triggered. Response characteristics displayed on the Step Response Analysis screen are not automatically updated when the DECS-150 operating mode is switched externally. The screen must be manually updated by exiting and then reopening the screen.
  • Page 181 Options are provided to adjust graph history and poll rate. Graph height sets the displayed graphs to a fixed height in pixels. When the Auto Size box is checked, all displayed graphs are automatically sized to equally fit the available space. History length is selectable from 1 to 30 minutes. Poll rate is adjustable DECS-150 Testing...
  • Page 182 Place a check in the Sync Graph Scrolling box to sync scrolling between all graphs when any horizontal scroll bar is moved. See Figure 24-7. Figure 24-6. Analysis Options Screen, Layout Tab Figure 24-7. Analysis Options Screen, Graph Display Tab Testing DECS-150...

  • Page 183: Modbus Communication

    Modbus communications use a master-slave technique in which only the master can initiate a transaction. This transaction is called a query. When appropriate, a slave (DECS-150) responds to the query. When a Modbus master communicates with a slave, information is provided or requested by the master.
  • Page 184 (MSB) of the field to 1 if the response is an error response. This field is 1 byte in length. The DECS-150 maps all available data into the Modicon 984 holding register address space supports the following function codes: Function 03 (03 hex) - read holding registers •...
  • Page 185 The header is 7 bytes long: • Transaction Identifier – Used for transaction pairing, the Modbus server copies in the response the transaction identifier of the request. DECS-150 Modbus ® Communication...
  • Page 186 DECS-150 Modbus ® via Ethernet Modbus can communicate through Ethernet if the IP address of the DECS-150 is configured as described in the Communications section of this manual. Detailed Message Query and Response A detailed description of DECS-150 supported message queries and responses is provided in the following paragraphs.
  • Page 187 If the query is a broadcast (device address = 0), no response message is returned. If the DECS-150 receives this query while in the listen only mode, no response message is generated. Otherwise, a response message identical to the query message is transmitted prior to the communications restart.
  • Page 188 Data Block byte count and data. The DECS-150 will perform the write when the device address in query is a broadcast address or the same as the DECS-150 Modbus Unit ID (device address).
  • Page 189 CRC Lo error check Response The response message echoes the Query message after the register has been altered. Data Formats DECS-150 systems support the following data types: Data types mapped to 2 registers • Unsigned Integer 32 (Uint32) Floating Point (Float)
  • Page 190 The Uint16 Data Format is listed in Binary Points (Table 25-6), below. Example: Register 900 occupies 16 rows in the Register Table where each row gives the name of specific bit-mapped data such as 900-0 indicates bit 0 of register 900 is mapped to RF-TRIG. Modbus ® Communication DECS-150...
  • Page 191 This field contains a two-byte CRC value for transmission error detection. The master first calculates the CRC and appends it to the query message. The DECS-150 system recalculates the CRC value for the received query and performs a comparison to the query CRC value to determine if a transmission error has occurred.
  • Page 192 Secure DECS-150 Login via Modbus To login to the DECS-150 via Modbus, write the string username|password to the Secure Login register (500). Substitute “username” with the user name of the desired access level, include the pipe “|” symbol, and substitute “password”...
  • Page 193 True=1 False=0 Alarms PSS Current Unbalanced Alarm 901 bit 9 Uint16 True=1 False=0 Alarms PSS Power Below Threshold Alarm 901 bit 10 Uint16 True=1 False=0 Alarms PSS Speed Failed Alarm 901 bit 11 Uint16 True=1 False=0 DECS-150 Modbus ® Communication...
  • Page 194 904 bit 11 Uint16 True=1 False=0 DECS Control Preposition 3 Active 904 bit 12 Uint16 True=1 False=0 DECS Control Var Active 904 bit 13 Uint16 True=1 False=0 DECS Control PF Active 904 bit 14 Uint16 True=1 False=0 Modbus ® Communication DECS-150...
  • Page 195 Configurable Protection Threshold 4 Trip 907 bit 15 Uint16 True=1 False=0 Configurable Protection 4 Configurable Protection Threshold 1 Pickup 908 bit 0 Uint16 True=1 False=0 Configurable Protection 4 Configurable Protection Threshold 1 Trip 908 bit 1 Uint16 True=1 False=0 DECS-150 Modbus ® Communication...
  • Page 196 Network Load Share Receiving ID 8 911 bit 2 Uint16 True=1 False=0 Network Load Share Receiving ID 9 911 bit 3 Uint16 True=1 False=0 Network Load Share Receiving ID 10 911 bit 4 Uint16 True=1 False=0 Modbus ® Communication DECS-150...
  • Page 197 True=1 False=0 Grid Code Parameters LVRT Enable 914 bit 5 Uint16 True=1 False=0 Grid Code Parameters LVRT Active 914 bit 6 Uint16 True=1 False=0 Grid Code Parameters Grid Code Enabled 914 bit 7 Uint16 True=1 False=0 DECS-150 Modbus ® Communication...
  • Page 198 Positive Sequence Voltage 1022 Float Per Unit -10 – 10 Per Unit Meter Negative Sequence Voltage 1024 Float Per Unit -10 – 10 Per Unit Meter Positive Sequence Current 1026 Float Per Unit -10 – 10 Modbus ® Communication DECS-150...
  • Page 199 Generator Voltage Meter 1118 Float Volt 0–2000000000 Primary 1 Generator Voltage Meter 1120 Float Degree 0–360 Angle 1 Generator Voltage Meter 1122 Float Degree 0–360 Angle 1 Generator Voltage Meter 1124 Float Degree 0–360 Angle 1 DECS-150 Modbus ® Communication...
  • Page 200 -1.00E+09 – 0.00E+00 Energy Meter VA hour total 1220 Float Varhour 0.00E+00 – 1.00E+09 DECS Regulator Meter NLS Error Percent 1222 Float Percent DECS Regulator Meter Current Magnitude Pickup 1224 Float Per Unit -10 – 10 Modbus ® Communication DECS-150...
  • Page 201 Grid Code APC Bias Voltage 1274 Float Grid Code LVRT Q Desired 1276 Float Per Unit -10 – 10 Grid Code LVRT Bias Voltage 1278 Float Grid Code Test Signal 1280 Float Reserved 1282 Reserved 1284 DECS-150 Modbus ® Communication...
  • Page 202 Float 0–11 OEL Secondary Takeover Current Min On 1756 Float 0–7 OEL Secondary Takeover Time Dial On 1758 Float 0.1–20 UEL Primary Curve X1 1760 Float kilowatt 0–62 UEL Primary Curve X2 1762 Float kilowatt 0–62 Modbus ® Communication DECS-150...
  • Page 203 Setpoints Table 25-9. Setpoint Group Parameters Name Register Type Bytes Unit Range Field Current Regulation Setpoint 2200 Float Setpoint adjustment range determined by registers 2212 and 2214. Field Current Regulation Traverse Rate 2202 Float Second 1–200 DECS-150 Modbus ® Communication...
  • Page 204 2212 and 2214. Generator Voltage Pre-position Mode 3 2274 Uint32 Maintain=0 Release=1 Generator Voltage Pre-position 3 2276 Float Volt Setpoint adjustment range determined by registers 2228 and 2230. Generator var Pre-position Mode 3 2278 Float Maintain=0 Release=1 Modbus ® Communication DECS-150...
  • Page 205 0–1800 PLC Timed Element Settings Logic Timer 15 Output Timeout 2428 Float 0–1800 PLC Timed Element Settings Logic Timer 16 Output Timeout 2430 Float 0–1800 PLC Timed Element Settings Counter 1 Output Timeout 2432 Float 0–1800 DECS-150 Modbus ® Communication...
  • Page 206 2498 Uint32 Disabled=0 Enabled=1 Network Load Share Config Mismatch Delay 2500 Float Second 0.2–10 Reserved 2502-04 Reactive Cross Current Load Share Ki Gain 2506 Float 0–1000 Reactive Cross Current Load Share Max Vc 2508 Float 0–1 Modbus ® Communication DECS-150...
  • Page 207 1–500000 Configuration Bus Volt Ratio Secondary 2646 Float 1–600 Configuration Bus Volt Rated Primary LL 2648 Float Volt 1–90000 Configuration Gen Current Connection 2650 Int32 CT_B=1 CT_ABC=6 Configuration Gen Current Ratio Primary 2652 Float 1–99999 Configuration DECS-150 Modbus ® Communication...
  • Page 208 0–3 DECS Control System Option Volts per Hertz Slope Time 2724 Float Second 0–10 DECS Control System Option Voltage Match Band 2726 Float Percent 0–20 DECS Control System Option Voltage Match Reference 2728 Float Percent 0–700 Modbus ® Communication DECS-150...
  • Page 209 Field Overvoltage Primary Pickup 3134 Float Disabled=0, 1–300 Field Overvoltage Primary Time Delay 3136 Float Millisecond Instantaneous=0, 0–30000 Field Overvoltage Secondary Mode 3138 Uint32 Disabled=0 Enabled=1 Field Overvoltage Secondary Pickup 3140 Float Disabled=0, 1 - 300 DECS-150 Modbus ® Communication...
  • Page 210 Primary Voltage 3216 Float Percent Disabled=0, 5–100 Inhibit Secondary Mode 3218 Uint32 Disabled=0 Under=2 Secondary Pickup 3220 Float Hertz Disabled=0, 30–70 Secondary Time 3222 Float Millisecond 100–300000 Delay Secondary Voltage 3224 Float Percent Disabled=0, 5–100 Inhibit Modbus ® Communication DECS-150...
  • Page 211 C=58 Gen VAN=59 Gen VBN=60 Gen VCN=61 Cross Current=62 GenScaledPF=63 Network Load Share Error Percent=65 No Param Selected=64 LVRT Output=66 APC Output=67 Configurable Protection 2 Hysteresis 3268 Float Percent 0–100 Configurable Protection 2 Arming Delay 3270 Float Second 0–300 DECS-150 Modbus ® Communication...
  • Page 212 Threshold 4 Type 3332 Int32 Disabled=0 Over=1 Under=2 Configurable Protection 3 Threshold 4 Pickup 3334 Float -999999 – 999999 Configurable Protection 3 Threshold 4 3336 Float Second 0–300 Activation Delay Configurable Protection 3 Label 3338 String 0–16 Modbus ® Communication DECS-150...
  • Page 213 C=58 Gen VAN=59 Gen VBN=60 Gen VCN=61 Cross Current=62 GenScaledPF=63 Network Load Share Error Percent=65 No Param Selected=64 LVRT Output=66 APC Output=67 Configurable Protection 5 Hysteresis 3388 Float Percent 0–100 Configurable Protection 5 Arming Delay 3390 Float Second 0–300 DECS-150 Modbus ® Communication...
  • Page 214 Threshold 4 Type 3452 Int32 Disabled=0 Over=1 Under=2 Configurable Protection 6 Threshold 4 Pickup 3454 Float -999999 – 999999 Configurable Protection 6 Threshold 4 3456 Float Second 0–300 Activation Delay Configurable Protection 6 Label 3458 String 0–16 Modbus ® Communication DECS-150...
  • Page 215 C=58 Gen VAN=59 Gen VBN=60 Gen VCN=61 Cross Current=62 GenScaledPF=63 Network Load Share Error Percent=65 No Param Selected=64 LVRT Output=66 APC Output=67 Configurable Protection 8 Hysteresis 3508 Float Percent 0–100 Configurable Protection 8 Arming Delay 3510 Float Second 0–300 DECS-150 Modbus ® Communication...
  • Page 216 T'do=1.0 Te=0.17=1 T'do=1.5 Te=0.25=2 T'do=2.0 Te=0.33=3 T'do=2.5 Te=0.42=4 T'do=3.0 Te=0.50=5 T'do=3.5 Te=0.58=6 T'do=4.0 Te=0.67=7 T'do=4.5 Te=0.75=8 T'do=5.0 Te=0.83=9 T'do=5.5 Te=0.92=10 T'do=6.0 Te=1.00=11 T'do=6.5 Te=1.08=12 T'do=7.0 Te=1.17=13 T'do=7.5 Te=1.25=14 T'do=8.0 Te=1.33=15 T'do=8.5 Te=1.42=16 T'do=9.0 Te=1.50=17 T'do=9.5 Te=1.58=18 Modbus ® Communication DECS-150...
  • Page 217 PSS Primary Switch 8 4320 Uint32 Disabled=0 Enabled=1 PSS Primary Switch 9 4322 Uint32 Exclude=0 Include=1 PSS Primary Switch 10 4324 Uint32 Disabled=0 Enabled=1 PSS Primary Switch 11 4326 Uint32 Disabled=0 Enabled=1 PSS Primary Tw1 4328 Float Second 1–20 DECS-150 Modbus ® Communication...
  • Page 218 PSS Primary Tr 4400 Float Second 0.01–1 PSS Primary Supervisory 4402 Float 0–1 Function Power-On Threshold PSS Primary Supervisory 4404 Float 0–1 Function Power-On Hysteresis PSS Secondary M 4406 Uint32 1–5 PSS Secondary N 4408 Uint32 0–1 Modbus ® Communication DECS-150...
  • Page 219 PSS Secondary Stabilizer 4482 Float -100 – 100 Gain Ks PSS Secondary Output 4484 Float 0–0.5 Limiting Upper Limit PSS Secondary Output 4486 Float -0.5 – 0 Limiting Lower Limit PSS Secondary Xq 4488 Float 0–5 DECS-150 Modbus ® Communication...
  • Page 220 Q(P) Point P09 4864 Float Per Unit 0–1.5 Q(P) Point P10 4866 Float Per Unit 0–1.5 Q(P) Point Q01 4868 Float Per Unit -0.7 – 0.7 Q(P) Point Q02 4870 Float Per Unit -0.7 – 0.7 Modbus ® Communication DECS-150...
  • Page 221 -100 – 100 Q U Gain 4948 Float -100 – 100 Q Remote Gain 4950 Float -100 – 100 Q Limit Q Reference 4952 Float Per Unit -0.45 – 0.45 Grid Reconnect Stability Timer 4954 Float Minute 0–30 DECS-150 Modbus ® Communication...
  • Page 222 -0.45 – 0.45 Active Power Adjust Modbus 5014 Float Per Unit -2 – 2 APC Bridge Enable 5016 Uint32 Disabled=0 Enabled=1 LVRT Bridge Enable 5018 Float Disabled=0 Enabled=1 PF Active Power Level 5020 Float Per Unit 0–1 Modbus ® Communication DECS-150...

  • Page 223: Maintenance

    Only a soft cloth and water-based solutions should be used to clean the front panel. Do not use solvents. Storage If the DECS-150 is not installed immediately, store it in the original shipping package in a moisture- and dust-free environment.
  • Page 224 26-2 9492600990 Maintenance DECS-150...

  • Page 225: Troubleshooting

    If power factor, var, or watt readings are significantly different from the expected readings for a known load, verify that the B-phase current sensing input of the DECS-150 is connected to a CT on phase B and not phases A or C.
  • Page 226 1 minute. If the front panel Overexcitation Limiting indicator is not lit, proceed to Step 8. Step 8. Verify that the DECS-150 soft start settings are correct. Too long of a soft start setting may give the appearance of no buildup.
  • Page 227 9492600990 27-3 Step 4a. If the DECS-150 is being shunt powered (non-PMG), verify that the power potential transformer (if used) has the correct turns ratio, is sized properly, and is supplying the correct voltage level to the power input. If the turns ratio of the power potential transformer is incorrect, is sized too small, or is not supplying the correct input power, replace the power potential transformer.
  • Page 228 Poor Voltage Regulation Step 1. Verify that the DECS-150 is properly grounded. If the DECS-150 is not properly grounded, connect a dedicated ground wire to the terminal labeled GND on the DECS-150. If the DECS-150 is properly grounded, proceed to Step 2.
  • Page 229 Step 5. Refer to the machine manual. Machine is defective. Underexcitation Limiting Indicator is Annunciating Step 1. Verify that the DECS-150 Machine Voltage setpoint is not being driven to a lower level. The setpoint can be affected by the Raise/Lower contact inputs or by the Auxiliary input.
  • Page 230 If the 52L/M contact input is open, proceed to Step 2. Step 2. Verify that the DECS-150 52J/K contact input (if present) is closed or the Var/PF function is disabled via BESTCOMSPlus. Var/PF operation must be disabled for droop operation. If var/PF operation is disabled, proceed to Step 3.
  • Page 231 9492600990 27-7 Step 8. Verify that your DECS-150 is compatible with the current sensing transformer (1 A or 5 A secondary) being used. For example, a current sensing transformer with a 1 ampere output rating would produce very little droop if the DECS-150 has a 5 ampere current transformer input.
  • Page 232 27-8 9492600990 Troubleshooting DECS-150...

  • Page 233: Specifications

    9492600990 28-1 28 • Specifications DECS-150 Digital Excitation Control Systems have the following features and capabilities. Operating Power Voltage Range For 63 Vdc Excitation Power ..100 to 139 Vac or 125 Vdc For 125 Vdc Excitation Power ... 190 to 277 Vac single-phase, 190 to 260 Vac three-phase, or 250 Vdc Frequency Range ......
  • Page 234 General Purpose ......7 A, 24 Vdc/240 Vac Pilot Duty .......... 2 A, 240 Vac (The load must be in parallel with a diode rated at least three times the coil current and three times the coil voltage.) Breaker Shunt Trip Output ....100 mAdc Specifications DECS-150...
  • Page 235 Regulation In regulation modes that rely upon the monitoring of the generator terminal voltage and current, the DECS-150 senses and responds to the measured rms quantities. FCR Operating Mode Setpoint Range ........ 0 to 7 Adc (70°C ambient) or 0 to 10 Adc (55°C ambient) in 0.1 Adc increments Regulation Accuracy ......
  • Page 236 Range 0 or 5 to 100% of Rated Voltage Increment ......... 1% Field Protection Functions Field Overvoltage Pickup Range 0 or 1 to 300 Vdc Increment ......... 1 Vdc Time Delay Range 0 to 30 s Increment ......... 0.1 s Specifications DECS-150...
  • Page 237 Range 0 to 90% of Rated Gen Voltage Increment ......... 1% Soft Start Time Range 1 to 7,200 s Increment ......... 1 s Voltage Matching Accuracy........... Machine rms voltage is matched with the bus rms voltage to within ±0.5% of the machine voltage. DECS-150 Specifications...
  • Page 238 Low Current Level Pickup Range 0 to 7 Adc (70°C ambient) or 0 to 10 Adc (55°C ambient) Increment ......... 0.01 Adc Sequence of Events Recording (SER) See the Reports section. Data Logging (Oscillography) See the Reports section. Specifications DECS-150...
  • Page 239 The battery polarity must be correct in order to provide backup for the real-time clock. It is recommended that the battery be removed if the DECS-150 is to be operated in a salt-fog environment. Salt-fog is known to be conductive and may short-circuit the battery.
  • Page 240 EN61000-4-2 HALT (Highly Accelerated Life Testing) HALT is used by Basler Electric to prove that our products will provide the user with many years of reliable service. HALT subjects the device to extremes in temperature, shock, and vibration to simulate years of operation, but in a much shorter period.
  • Page 241 Det Norske Veritas (DNV) • American Bureau of Shipping (ABS) IEC 60092-504 used for evaluation. For current certificates, see www.basler.com. Grid Code Compliance Component certified per standard VDE-AR-N 4110. UL Approval This product is recognized to applicable Canadian and US safety standards and requirements by UL.
  • Page 242 • TP TC 020/2011 For current certificate, see www.basler.com. Patent Basler Electric. Digital Excitation Control Systems Utilizing Self-Tuning PID Gains and an Associated Method of Use. US Patent 20090195224, filed January 31, 2008 and issued August 6, 2009. Specifications DECS-150...

  • Page 243: Bestcomsplus Settings Loader Tool

    When BESTCOMSPlus installation is complete, a Basler Electric folder is added to the Windows programs menu. This folder is accessed by clicking the Windows Start button and then accessing the Basler Electric folder in the Programs menu. The Basler Electric folder contains an icon that starts the BESTCOMSPlus Settings Loader Tool.
  • Page 244 One entry, or row, in the Loader Grid contains all of the necessary data to associate a product settings file with a bar code. New entries can be added. Existing entries can be edited, deleted, and uploaded to a Basler product. Figure 29-1. Loader Grid Scanning Bar Codes Place the cursor in the text field, found at the top of the Loader Grid screen, and scan a bar code.
  • Page 245 Select an entry and click Upload. A dialog appears which provides connection options for the appropriate type of device. Refer to the Basler product instruction manual for detailed connection information. Once a connection is established, the product settings associated with the entry are uploaded.
  • Page 246 Figure 29-3. Configuration, Settings Files Tab Connection Options Connection options consist of the three selections described below. Refer to the Basler product instruction manual for detailed connection information. Always Prompt for Connection: When enabled, a dialog appears which provides connection options for the appropriate type of device each time a connection attempt is made.
  • Page 247 5. Settings file is automatically highlighted and isolated in the grid. 6. Click Upload. 7. BESTCOMSPlus Settings Loader Tool automatically connects to device and uploads settings. Device connection is automatic unless “Always prompt for connection” is enabled. DECS-150 BESTCOMSPlus Settings Loader Tool...
  • Page 248 29-6 9492600990 DECS-150 BESTCOMSPlus Settings Loader Tool...
  • Page 250 Highland IL 62249-1074 USA Suzhou Industrial Park 15-06 Peninsula Plaza Tel: +1 618.654.2341 215122 Suzhou Singapore 179098 Fax: +1 618.654.2351 P.R. CHINA Tel: +65 68.44.6445 email: info@basler.com Tel: +86 512.8227.2888 Fax: +65 68.44.8902 Fax: +86 512.8227.2887 email: singaporeinfo@basler.com email: chinainfo@basler.com...

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