Basler DECS-100 Instruction Manual
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Basler DECS-100 Instruction Manual

Digital excitation control system
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  • Page 2 DECS-100. NOTE Be sure that the DECS-100 is hard-wired to earth ground with no smaller than 12 AWG copper wire attached to the ground terminal on the rear of the unit case. When the unit is configured in a system with other devices, it is recommended to use a separate lead to the ground bus from each unit.
  • Page 3 August 2001 CONFIDENTIAL INFORMATION of Basler Electric, Highland, IL. 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 interest of Basler Electric.
  • Page 4 MANUAL REVISION HISTORY The following information provides a historical summary of the changes made to the DECS-100 Instruction Manual (9 2875 00 991). Revisions are listed in reverse chronological order. Manual Version, ECO, and Date Change Rev B, 14282, 08/01 Added Embedded Software subsection to Section 5, BESTCOMS Software for the Windows Operating System .
  • Page 5 DECS-100 Introduction...
  • Page 6 Section 7 Maintenance and Troubleshooting ....... . . 7-1 DECS-100 Introduction...

  • Page 7: Table Of Contents

    Figure 1-1. DECS-100 Style Chart ........

  • Page 8: Section 1 • General Information

    Upon receipt of a DECS-100, be sure to check the style number against the requisition and the packing list to ensure that they agree.

  • Page 9: Specifications

    A ..No var or power factor control 1 ..Voltage matching 5 ..5 ampere CT secondary SPECIFICATIONS DECS-100 electrical and physical specifications are listed in the following paragraphs. Operating Power Bus Voltage Sensing (Optional)–continued Three-Phase:...

  • Page 10: Common Alarm Output

    Generator Voltage Range: 10 V to 79 kV Accuracy: ±0.5% (at 25EC) Generator Current Range: 0.04 to 1,000 A (1 A CTs) 0.1 to 5,000 A (5 A CTs) Accuracy: ±0.5% (at 25EC) Figure 1-2. Typical V/Hz Curves DECS-100 General Information...

  • Page 11: Environment

    299 mm x 79 mm x 146 mm (11.75" x 3.125" x 5.75") 48 Units: 841 mm x 653 mm x 352 mm (33.13" x 25.69" x 13.88") UL Recognition Recognized per Standard 508, UL File E97035 DECS-100 General Information...
  • Page 12 Table 2-1. DECS-100 Front Panel Indicator Descriptions ........

  • Page 13: Section 2 • Human-Machine Interface

    FRONT PANEL INDICATORS DECS-100 front panel indicators consist of seven red LEDs. Figure 2-1 shows the front panel indicators for the DECS-100. Table 2-1 describes the function of each front panel indicator. Figure 2-1. DECS-100 Front Panel Indicators Table 2-1.

  • Page 14: Communication Port

    DECS-100 is powered up following an overexcitation limiting shutdown. Var/P.F. Mode Active This LED lights to indicate that the DECS-100 is operating in the optional Var or Power Factor mode of control. Var/Power Factor control is enabled through BESTCOMS software and when the 52J/K contact input is open.
  • Page 15 DECS-100 OPERATING FEATURES ........
  • Page 16 DECS-100 functions are illustrated in the block diagram of Figure 3-1. A detailed description of each function block is provided in the paragraphs under the heading of DECS-100 Function Blocks . DECS-100 operating features include four operating modes, four protective functions, startup provisions, reactive droop compensation, underfrequency compensation, and optional voltage matching.
  • Page 17 Accessory Input (Auxiliary Adjust) This input allows adjustment of the DECS-100 regulation setpoint by the application of a positive or negative dc voltage across terminals A and B. Voltage of up to +3 Vdc may be applied to this input. The circuit induces a 1,000-ohm burden on the dc source.
  • Page 18 Closing a contact across terminals 52J and 52K disables var/power factor control. An open contact enables the DECS-100 to control the generator reactive power in either the var or the power factor mode. The contact has no effect when this function is not enabled in the software. For more information, refer to the Parallel Generator Compensation (52L/M) contact input.
  • Page 19 Accessory input, or through BESTCOMS software. Reactive Droop Compensation The DECS-100 provides a reactive droop compensation feature to assist in the sharing of reactive load during parallel generator operation. When this feature is enabled, the DECS-100 calculates the reactive portion of the generator load using the sensed generator output voltage and current quantities and then modifies the voltage regulation setpoint accordingly.
  • Page 20 LOSS OF GENERATOR SENSING indicator will light for 5 seconds. If transfer to manual is selected and a loss of sensing occurs, the relay output closes, and the DECS-100 transfers to the Manual mode of operation after the adjustable time delay expires. The DECS-100 will remain in this mode of operation until power is cycled.
  • Page 21 Overexcitation Limiting (Field Current) The DECS-100 field current limit is adjustable from 0 to 15 amperes in 0.1 ampere increments with an adjustable time delay that has a range of 0 to 10 seconds in 1 second increments. Both settings are made through BESTCOMS software.
  • Page 22 DECS-100 Connections for Typical Applications ........

  • Page 23: Section 4 • Installation

    MOUNTING The DECS-100 is normally located in the generator conduit box. It is designed for behind the panel mounting and requires a cutout for front panel viewing. Mounting hardware consists of six customer supplied, #12 thread-forming screws that pass through mounting holes in the conduit box and thread into the plastic shell of the DECS-100.
  • Page 24 Figure 4-1. DECS-100 Dimensions DECS-100 Installation...
  • Page 25 Figure 4-2. Cutout and Drilling Dimensions DECS-100 Installation...

  • Page 26: Connections

    IBM compatible PCs and hand-held computers. Figure 4-3 shows the terminal connections located on the rear panel of the DECS-100. Except as noted above, connections should be made with minimum wire size of 14 AWG.

  • Page 27: Bus Voltage Sensing Inputs (Optional)

    6U, 7, and 6D. To connect this switch, the center pole, or common terminal, must be connected to terminal 7. The other two terminals are connected to terminals 6U and 6D. This remote adjust switch may be mounted up to 150 feet away from the DECS-100 when using twisted, shielded cable.

  • Page 28: Power Supply Inputs

    The RS-232 port on the rear panel uses a DB-9 female connector. Figure 4-4 Illustrates the pin assignments of the communication port and Table 4-3 Identifies the RS-232 connector pin functions. A standard communication cable terminated with a DB-9 male connector is used for PC interface with the DECS-100 as shown in Figure 4-5.

  • Page 29: Decs-100 Connections For Typical Applications

    DECS-100 operating power is derived from a permanent magnet generator (PMG) and three-phase voltage sensing is applied to the DECS-100. Figure 4-7 shows another PMG application but with single-phase voltage sensing. Figure 4-8 shows an application where DECS-100 operating power is derived from the generator output (shunt application) and three-phase voltage sensing is applied to the DECS-100.
  • Page 30 Figure 4-6. Typical Connections for PMG application with ABC Rotation and Three-Phase Sensing DECS-100 Installation...
  • Page 31 Figure 4-7. Typical Connections for PMG Application with ABC Rotation and Single-Phase Sensing DECS-100 Installation...
  • Page 32 Figure 4-8. Typical Connections for Shunt Application with ABC Rotation and Three-Phase Sensing 4-10 DECS-100 Installation...
  • Page 33 Figure 4-9. Typical Connections for Shunt Application with ABC Rotation and Single-Phase Sensing DECS-100 Installation 4-11...

  • Page 34: Preliminary Setup

    Before starting the generator and DECS-100 for the first time, proceed as follows. 1. Tag and disconnect all wiring to the DECS-100. Be sure to insulate the wire terminals to prevent a short circuit.
  • Page 35 Saving Settings to DECS-100 Memory ........
  • Page 36 Figure 5-25. DECS-100 Embedded Program Loader ........

  • Page 37: Operating System

    Connect a communication cable between the rear RS-232 connector of the DECS-100 and the appropriate communication port of the PC. Refer to Figure 2-2 for the location of the DECS-100 RS-232 connector and Figure 4-5 for the required connections between the DECS-100 and a PC.

  • Page 38: Establishing Communication

    When RS-232 Port is selected, the Password dialog box of Figure 5-5 appears and prompts you to enter a password. Each DECS-100 is delivered with “decs” as the default password. See the Password Protection sub-section for information about changing the password.

  • Page 39: Changing Settings

    Settings are saved in nonvolatile memory (EEPROM). In the event of a power loss, these are the settings that are active at power up. If settings are changed and sent to the DECS-100, but not sent to EEPROM, the changed settings are lost if DECS-100 operating power is lost. When exiting BESTCOMS or closing communication, you are asked if you want to save the settings to EEPROM.

  • Page 40: System Settings

    Regulator Sensing Current (A). This setting field is used to enter the nominal output of the current transformer (CT) that supplies the DECS-100 with B-phase generator line current. A value of 1 A or 5 A may be entered. Version Numbers. These two version numbers are read-only. They indicate the BESTCOMS software version and the DECS-100 embedded software version.

  • Page 41: Setting Adjustments

    DECS-100 responds to a reactive load. The setpoint value is adjustable from 0 to 10 percent in increments of 0.01 percent. The setpoint is based on a 0.8 power factor load.

  • Page 42: Control Gain

    The soft-start time can be set from 1 to 7,200 seconds in 1 second increments. Voltage Matching - Speed (sec). This setting determines how quickly the generator voltage is adjusted by the DECS-100 to match the bus voltage. The Speed setting is adjustable from 0 to 300 seconds in 0.01 increments.
  • Page 43 Figure 5-11. Control Gain Screen Table 5-1. DECS-100 Stability Range Settings Time Constants Generator Stability Size Generator (T’do) Exciter (Texc) Range SMALL 0.17 0.25 0.33 0.42 0.50 0.58 0.67 0.75 0.83 0.92 1.00 1.08 1.17 1.25 1.33 1.42 1.50 1.58 10.0...

  • Page 44: Analysis

    VAR/PF - PF Integral Gain KI. This setting adjusts the integral gain and determines the characteristic of the DECS-100 dynamic response to a changed PF setting. PF KI values of 0 to 1,000 may be entered in increments of 0.01.

  • Page 45: Avr Tab

    Figure 5-13 illustrates the settings, sensing values, and alarm signal indicators of the FCR tab. The settings of the FCR tab make it possible to increment and decrement the FCR setpoint of the DECS-100. The sensing values and alarm signal indicators of the FCR tab are also displayed by the other tabs of the Analysis screen.

  • Page 46: Pf Tab

    Either a new value can be entered into the PF Value field or the pointer of the PF Step Response Settings dial can be adjusted interactively with your computer mouse. ® 5-10 DECS-100 BESTCOMS for Windows...

  • Page 47: Var Tab

    Response Settings dial will point to the value that was entered in the PF Value field. The new PF setpoint is then sent to the DECS-100 by clicking the button within the box labeled Power Factor Step Response - Send PF Value To DECS. Clicking and holding this button causes the button label to change from OK to Index 1.

  • Page 48: Protection Settings

    Settings dial or the slide scale, the Send % Value To DECS button must be clicked to send the revised setting to the DECS-100. Clicking the Send % Value To DECS button also updates the value shown in the Setpoint Value field.

  • Page 49: Protection Tab

    OEL - Current Level (A). The value of current in this field determines the excitation level that will cause the DECS-100 to issue an overexcitation limit alarm. A current level of 0 to 15 A may be entered in 0.001 increments.

  • Page 50: Metering, Operation And Alarms

    Loss of Sensing Voltage - Hardware Shutdown. Enabling Hardware Shutdown will cause the DECS-100 to remove field excitation when a loss of sensing voltage occurs. Disabling Hardware Shutdown prevents the DECS-100 from removing excitation during a loss of sensing voltage.
  • Page 51 Operating Status buttons are labeled PF, VAR, and OFF. Clicking the PF button changes the color of the adjacent PF indicator to green and causes the DECS-100 to maintain the desired power factor regulation point. The power factor regulation point can be set within the range of 0.6 lead to 0.6 lag.

  • Page 52: Alarm/Status Tab

    External Adjust terminals (6D and 7 to decrease, 6U and 7 to increase) of the DECS-100. Each click of the Raise button increases the voltage setpoint 0.01 volts; each click of the Lower button decreases the voltage setpoint 0.01 volts.

  • Page 53: Pid Data

    PID stands for Proportional, Integral, Derivative. The word proportional means that the response of the DECS-100 output is proportional or relative to the amount of change that is observed. Integral means that the DECS-100 output is proportional to the amount of time that a change is observed. Integral action eliminates offset.

  • Page 54: Pid Calculation Based On Input Values

    PID parameters can also be removed from the list. To remove a list (record), pull down the PID List and select the record or list so that the gain and time constant parameters are displayed. Click the Remove Record button and the listed record is deleted. ® 5-18 DECS-100 BESTCOMS for Windows...

  • Page 55: Retrieving Existing Data From The Pid List

    A settings file is created by clicking the save icon or by clicking File on the Menu bar and then clicking Save. When the file command is given, a dialog box asks if you want to save the current settings into a DECS-100 data file.

  • Page 56: Password Protection

    The upload process is started by clicking the open icon or clicking File on the menu bar and then clicking Open. A dialog box is then displayed (Figure 5-21) reminding you that the DECS-100 should be off-line before uploading settings. Clicking Yes loads the settings into DECS-100 memory.

  • Page 57: Terminating Communication

    Close Comm Port. You are asked if you want to save the settings to EEPROM. This question is asked even if no changes were made to the DECS-100 settings. When you execute the Close command (with a Yes or No to save settings to EEPROM), communication with the DECS-100 is terminated. If you choose to exit BESTCOMS (by clicking File on the menu bar and then Exit) without first closing communication, you are still given the opportunity to save the settings to EEPROM.
  • Page 58 5. Click the Start Transfer Data button to proceed with software uploading. The dialog box of Figure 5-27 appears and recommends that your DECS-100 settings be saved in a file that can be uploaded to the DECS-100 after the embedded firmware is updated.
  • Page 59 Figure 5-27. Settings File Reminder Dialog Box Clicking No allows you to exit the upload process so that a DECS-100 settings file can be created. Refer to the Settings Files subsection for information about creating a settings file. Clicking Yes continues with the upload process and displays the Open dialog box of Figure 5-28. The Open dialog box is used to locate and select the appropriate file for uploading to the DECS-100.
  • Page 60 Figure 5-30. DECS-100 Information After Upload ® 5-24 DECS-100 BESTCOMS for Windows...

  • Page 61: Platform

    Connecting the DECS-100 and Handheld ........

  • Page 62: Section 6 • Bestcoms Software For The Palm Os Platform

    100 and the user. BESTCOMS enables you to use a Palm OS handheld or personal digital assistant (PDA) to view and change DECS-100 settings and create settings files that can be uploaded to DECS-100 units. INSTALLATION BESTCOMS software for the Palm OS platform has the following minimum recommended installation and operating requirements.

  • Page 63: Connecting The Decs-100 And Handheld

    Connecting the DECS-100 and Handheld Communication between the DECS-100 and your handheld requires the proper connections. A readily available data cable can be used to connect your handheld to the DECS-100. If a data cable isn’t available, ® a 9-pin, male-to-male, null-modem adaptor can be connected in series with a HotSync cable.

  • Page 64: Bestcoms Operating Modes

    The Off-Line mode can be used to view and edit settings files when your handheld is not connected to the DECS-100. The handheld can then be connected to the DECS-100 and the settings file uploaded.

  • Page 65: Bestcoms Main Screen

    The BESTCOMS main screen of Figure 6-12 is the gateway to other BESTCOMS screens where you can make settings changes, view the status of DECS-100 alarms and outputs, view system parameters, the BESTCOMS version level, and contact information for Basler Electric customer service.

  • Page 66: Navigating Through The Setting Groups

    Navigating Through the Setting Groups DECS-100 settings are divided into the seven groups/screens listed below. Each setting group/screen is accessed from the BESTCOMS main screen. Configuration Settings Control Limiter AVR/FCR Gain Protection Var/PF Gain A group of settings is accessed by tapping the group name listed on the main screen. A summary of the individual settings available at each screen is provided in Table 6-1.

  • Page 67: Alarm And Contact Input Status

    ) on the Other Pages: line and then select Front Panel Alarms from the drop-down menu. The Alarms portion of this screen displays the status of the DECS-100 front panel LEDs. An alarm condition is indicated by a checked box ( ).

  • Page 68: Regulation And Voltage Matching Buttons

    Operating Mode Buttons The Operating Mode segment of the System Status screen (Figure 6-16) has three buttons labeled OFF, PF, and VAR. Tapping the PF button places the DECS-100 in the power factor operating mode and causes a checked box ( ) to appear below the PF button.

  • Page 69: Bestcoms File Operations Screen

    ) on the File Actions line. Selections from the drop- down menu enable you to create a settings file, send a settings file to the DECS-100, retrieve settings from the DECS-100, and delete user-created settings files from the file list on the File Operations screen.

  • Page 70: Reading Settings From The Decs-100

    Tap the Ok button in the “Connect Cable” dialog box to send the file. Tap the Ok button to acknowledge that the settings were sent to the DECS-100. To save the settings in DECS-100 memory, tap the Save to DECS button which is accessible from any of the BESTCOMS screens.
  • Page 71 No Voltage Matching ..........7-6 DECS-100 Maintenance and Troubleshooting...

  • Page 72: Maintenance And Trouble-Shooting

    Basler Electric personnel. TROUBLESHOOTING If you do not get the results that you expect from the DECS-100, first check the programmable settings for the appropriate function. Use the following troubleshooting procedures when difficulties are encountered in the operation of your excitation system.

  • Page 73: Low Generator Output Voltage

    If the front panel OVEREXCITATION LIMITING indicator is not lit, proceed to Step 7. Step 7. Verify that the DECS-100 soft start settings are correct. Too long of a soft start setting may give the appearance of no buildup. If the soft start settings are incorrect, adjust the settings.

  • Page 74: High Generator Output Voltage

    Step 1. Verify that the case of the DECS-100 is properly grounded. If the DECS-100 is not properly grounded, connect a dedicated ground wire to the quarter-inch fast-on connector labeled GND on the rear of the DECS-100 case. If the DECS-100 is properly grounded, proceed to Step 2.

  • Page 75: Generator Output Unstable (Hunting)

    Verify that the generator exciter field voltage requirements are compatible with the DECS-100. If the exciter field voltage requirements are not compatible with the DECS-100, contact Basler Electric Customer Service for recommendations. If the exciter field voltage requirements are compatible with the DECS-100, proceed to Step 3. Step 3. Replace the DECS-100.

  • Page 76: Overexcitation Limiting Indicator Is Annunciating

    If the 52L/M contact input is open, proceed to Step 2. Step 2. Verify that the DECS-100 52J/K contact input (if present) is closed or the Var/PF function is disabled via BESTCOMS. Var/PF operation must be disabled for droop operation. If Var/PF operation is disabled, proceed to Step 3.

  • Page 77: No Voltage Matching

    If the load being applied to the generator is inductive, proceed to Step 7. Step 7. Verify that your DECS-100 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 your DECS-100 has a 5 ampere current transformer input.

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