Danfoss VLT Series Design Manual
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Danfoss VLT Series Design Manual

Danfoss VLT Series Design Manual

Hvac drive
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VLT
®
HVAC Drive Design Guide
Contents
3. VLT HVAC Selection
4. How to Order
5. How to Install
VLT HVAC Controls
PID
General aspects of EMC
Galvanic isolation (PELV)
Ground leakage current
Control with brake function
Mechanical brake control
Extreme running conditions
Specifications
Efficiency
Special Conditions
Purpose of derating
Automatic adaptations to ensure performance
Options and Accessories
Analog I/O option MCB 109
Ordering form
Type Code String
Ordering Numbers
MG.11.B4.22 - VLT
®
is a registered Danfoss trademark.
Contents
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Summary of Contents for Danfoss VLT Series

  • Page 1: Table Of Contents

    Purpose of derating Automatic adaptations to ensure performance Options and Accessories Analog I/O option MCB 109 4. How to Order Ordering form Type Code String Ordering Numbers 5. How to Install MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 2 Lead Pump Alternation Wiring Diagram Cascade Controller Wiring Diagram Start/Stop conditions 7. RS-485 Installation and Set-up RS-485 Installation and Set-up FC Protocol Overview Network Configuration FC Protocol Message Framing Structure Examples Modbus RTU Overview MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 3 ® HVAC Drive Design Guide Contents Modbus RTU Message Framing Structure How to Access Parameters Examples Danfoss FC Control Profile 8. Troubleshooting Alarms and warnings Index MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 4 1. How to Read this Design Guide ® HVAC Drive Design Guide MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 5: How To Read This Design Guide

    Danfoss A/S reserves the right to revise this publication at any time and to make changes to its contents without prior notice or any obligation to notify former or present users of such revisions or changes.

  • Page 6: Approvals

    1. How to Read this Design Guide ® HVAC Drive Design Guide x = Revision number yy = Language code www.danfoss.com/BusinessAreas/ Danfoss Drives technical literature is also available online at DrivesSolutions/Documentations/Technical+Documentation 1.1.3. Approvals 1.1.4. Symbols Symbols used in this guide. NOTE Indicates something to be noted by the reader.

  • Page 7: Abbreviations

    "Off" key. Functions are divided into two groups. Group 2 Start, Pulse start, Reversing, Start reversing, Functions in group 1 have higher priority than Jog and Freeze output functions in group 2. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 8 The rated motor current (nameplate data). The rated motor speed (nameplate data). The rated motor power (nameplate data). The rated torque (motor). The instantaneous motor voltage. The rated motor voltage (nameplate data). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 9 Determines the relationship between the reference input at 0% value (typically 0 V, 0 mA, 4 mA) and the resulting reference. The minimum reference value set in par. 3-02. Miscellaneous: Analog Inputs The analog inputs are used for controlling various functions of the adjustable frequency drive. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 10 An intermittent duty rating refers to a sequence of duty cycles. Each cycle consists of an on-load and an off-load period. The operation can be either a periodic or non-periodic duty. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 11 Smart Logic Control (SLC) The SLC is a sequence of user-defined actions executed when the associated user-defined events are evaluated as true by the SLC. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 12 In addition, a high power factor indicates that the different harmonic currents are low. The adjustable frequency drive's built-in DC coils produce a high power factor, which minimizes the imposed load on the line power supply. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 13: Introduction To The Vlt Hvac Drive

    Make sure that all voltage inputs have been disconnected and that the necessary time has passed before commencing repair work. Installation at High Altitudes At altitudes higher than 6,600 feet [2 km], please contact Danfoss Drives regarding PELV. Warning against Unintended Start 1.

  • Page 14: Disposal Instructions

    Equipment containing electrical components may not be disposed of together with domestic waste. It must be collected separately as electrical and electronic waste in accordance with local and currently valid legislation. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 15 Design Guide Software version: 2.0x These instructions can be used for all VLT HVAC adjustable frequency drives with software version 2.0x The software version number can be found in parameter 15-43. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 16: Ce Labeling

    January 1, 1997. The directive applies to all electrical equipment and appliances used in the 50-1000 V AC and the 75-1500 V DC voltage ranges. Danfoss uses CE labels in accordance with the directive and will issue a declaration of conformity upon request.
  • Page 17 The Design Guide offers detailed instructions for installation to ensure EMC-correct installation. Furthermore, Danfoss specifies which our different products comply with. Danfoss gladly provides other types of assistance that can help you obtain the best EMC result. 2.2.4. Compliance with EMC Directive 89/336/EEC As mentioned, the adjustable frequency drive is mostly used by professionals of the trade as a complex component forming part of a larger appliance, system or installation.

  • Page 18: Air Humidity

    This is done by observing existing installations in this environment. A typical indicator of harmful airborne liquids is the presence of water or oil on metal parts, or the corrosion of metal parts. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 19: Vibration And Shock

    If the system in question only needs to be able to supply a flow corresponding to 100% a few days each year, while the average is below 80% of the rated flow for the remainder of the year, the amount of energy saved is even greater than 50%. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 20 = Rated power = Reduced flow = Reduced power H = Pressure n = Speed regulation = Rated pressure = Rated speed = Reduced pressure = Reduced speed F low Pressure Power MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 21 42,5 18.615 42,5 18.615 1314 38,5 50.589 29,0 38.106 1752 35,0 61.320 18,5 32.412 1752 31,5 55.188 11,5 20.148 1752 28,0 49.056 11.388 1752 23,0 40.296 6.132 Σ 8760 275.064 26.801 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 22 It is possible to calculate the cost of installing the two different systems. In the example, the two systems can be established at roughly the same price. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 23 2.6.9. Without an adjustable frequency drive The figure shows a fan system made in the traditional way. Energy Management sys- D.D.C. Direct Digital Control E.M.S. V.A.V. Variable Air Volume Sensor P Pressure Sensor T Temperature MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 24 2. Introduction to the VLT HVAC Drive ® HVAC Drive Design Guide 2.6.10. With an adjustable frequency drive The figure shows a fan system controlled by adjustable frequency drives. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 25 The next few pages give typical examples of applications within HVAC. If you would like to receive further information about a given application, please ask your Danfoss supplier for an information sheet that gives a full description of the application.
  • Page 26 The advanced PID controller of the VLT HVAC Drive can be used to eliminate the need for additional controllers. Pressure signal Cooling coil Heating coil VAV boxes Filter Supply fan Pressure transmitter Flow Return fan Flow MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 27: Constant Air Volume

    The return fan modulates to maintain a static pressure setpoint. By decreasing the air flow, energy used to heat or cool the fresh air is also reduced, adding further savings. Several features of the Danfoss HVAC dedicated adjustable frequency drive, the VLT ®...

  • Page 28: Cooling Tower Fan

    The adjustable frequency drives can also be used to turn the fan on and off as needed. Several features of the Danfoss HVAC dedicated drive, the VLT HVAC Drive can be utilized to improve the performance of your cooling tower fan application. As the cooling tower fans drop below a certain speed, the effect the fan has on cooling the water becomes insignificant.

  • Page 29: Condenser Pumps

    This can amount to savings of 15-20% or more. Trimming the pump impeller is irreversible, thus if the conditions change and higher flow is required the impeller must be replaced. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 30: Primary Pumps

    The other method is local speed determination. The operator simply decreases the output fre- quency until the design flow rate is achieved. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 31 In the event the flow rate needs to be increased later in the systems life, the adjustable frequency drive can simply increase the pump speed in- stead of requiring a new pump impeller. Flowmeter Flowmeter MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 32: Secondary Pumps

    Please note that when running multiple pumps in parallel, they must run at the same speed to maximize energy savings, either with individual dedicated drives or one drive running multiple pumps in parallel. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 33 LCP using the [Hand ON] and [Off] keys. Alarms can be reset via the [RESET] key. After pressing the [Hand On] key, the adjustable frequency drive goes into hand mode and follows (as default) the local reference set by using the LCP arrow keys. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 34 One of them is always active, but both cannot be active at the same time. Par. 1-00 Configuration Mode determines what kind of application control principle (i.e., open- loop or closed-loop) is used when the remote reference is active (see table above for the conditions). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 35 The figure is a block diagram of the drive’s closed-loop controller. The details of the reference handling block and feedback handling block are described in their respective sections below. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

  • Page 36: Mg.11.B4.22 - Vlt

    The table below summarizes the additional parameters that may be useful in such applications. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 37 If the re- User de- frigerant used is not listed here, select fined [7] and specify the characteristics of the refrigerant in par. 20-31, 20-32 and 20-33. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 38 Large values of Low-pass Filter Time will provide more filtering, but may cause the con- troller to not respond to actual variations in the feedback signal. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 39 3. Temperature feedback via transmitter (14°-104° F [-10° - +40° C], 4-20 mA) connected to terminal 54. Switch S202 be- hind the local control panel set to ON (cur- rent input). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 40 Adjust the drive’s closed-loop controller, if 20-93 See Optimization of the PID Controller be- needed. 20-94 low. 8) Finished! All to LCP Save the parameter settings to the LCP for 0-50 safekeeping. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 41 1940s and is still commonly used today. It generally provides acceptable control performance using a simple experiment and parameter calculation. NOTE This method must not be used on applications that could be damaged by oscillations created by marginally stable control settings. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 42 Experience has shown that the control setting according to the Ziegler Nichols rule provides a good closed-loop response for many systems. If necessary, the operator can perform the final tuning of the control iteratively in order to modify the response of the control loop. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 43 ® HVAC Drive Design Guide 2. Introduction to the VLT HVAC Drive 2.8.7. Reference Handling A block diagram of how the drive produces the remote reference is shown below. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 44 Where X is the external reference, the preset reference or the sum of these, and Y is the preset relative reference (par. 3-14) in [%]. NOTE If Y, the preset relative reference (par. 3-14), is set to 0%, the reference will not be affected by the scaling MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 45 [14] is selected, the setpoint and feedback of Zone 1 are sent to the PID controller, since this has the smaller difference (feedback is higher than setpoint, resulting in a negative MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 46 Temperature − + 1 ) − pressure where A1, A2 and A3 are refrigerant-specific constants. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 47 Moreover, ensure good electrical contact from the mounting plate through the mounting screws to the adjustable frequency driver chassis. NOTE When non-shielded cables are used, some emission requirements are not complied with, although the immunity requirements are observed. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 48 Equipment used in a public supply network. Restricted distribution. Class A2: Equipment used in a public supply network. Class B1: Equipment used in areas with a public supply network (residential, commerce, and light industries). Unrestricted distribution. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 49 Enclosure 8 kV AD — — 10 V/m — 6 kV CD AD: Air Discharge CD: Contact Discharge CM: Common mode DM: Differential mode 1. Injection on cable shield. 2.2: Immunity MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 50 The functional galvanic isolation (a and b in drawing) is for the 24 V backup option and for the RS-485 standard bus interface. At altitudes higher than 6,600 feet [2 km], please contact Danfoss Drives regarding PELV. MG.11.B4.22 - VLT ®...
  • Page 51 The intermittent duty cycle for the resistor is calculated as follows: Duty Cycle = t T = cycle time in seconds is the braking time in seconds (as part of the total cycle time) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 52 HVAC Drive Design Guide Danfoss offers brake resistors with duty cycle of 5%, 10% and 40% suitable for use with the VLT® FC102 HVAC drive series. If a 10% duty cycle resistor is applied, it is capable of absorbing braking energy up to 10% of the cycle time, with the remaining 90% being used to dissipate heat from the resistor.
  • Page 53 Incorrect slip compensation setting may cause higher DC link voltage. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 54 Operation within the torque limit is limited in time (0-60 s) in par. 14-25. 2.14.1. Motor Thermal Protection The motor temperature is calculated on the basis of motor current, output frequency, and time or thermistor. See par. 1-90 in the Programming Guide. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 55 Weight enclosure IP 21 [kg] Weight enclosure IP 55 [kg] 13.5 13.5 13.5 13.5 13.5 Weight enclosure IP 66 [kg] 13.5 13.5 13.5 13.5 13.5 Efficiency 0.96 0.96 0.96 0.96 0.96 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 56 Estimated power loss at rated max. load [W] Weight enclosure IP 20 [kg] Weight enclosure IP 21 [kg] Weight enclosure IP 55 [kg] Weight enclosure IP 66 [kg] 0.96 0.96 0.96 0.96 Efficiency MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 57 [W] Weight enclosure IP 20 [kg] Weight enclosure IP 21 [kg] Weight enclosure IP 55 [kg] Weight enclosure IP 66 [kg] Efficiency 0.96 0.97 0.97 0.97 0.97 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 58 Weight enclosure IP 55 [kg] 13.5 13.5 13.5 13.5 13.5 14.2 14.2 Weight enclosure IP 66 [kg] 13.5 13.5 13.5 13.5 13.5 14.2 14.2 0.96 0.97 0.97 0.97 0.97 0.97 0.97 Efficiency MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 59 Weight enclosure IP 20 [kg] Weight enclosure IP 21 [kg] Weight enclosure IP 55 [kg] Weight enclosure IP 66 [kg] Efficiency 0.98 0.98 0.98 0.98 0.98 0.98 0.98 0.98 0.98 0.99 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 60 A or slot B, each.) Although measurements are made with state of the art equipment, some measurement inaccuracy must be allowed for (+/-5%). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 61 Max. motor cable length, shielded/armored VLT HVAC Drive: 492 ft [150 m] Max. motor cable length, unshielded/unarmored VLT HVAC Drive: 984 ft [300 m] Max. cross-section to motor, line power, load sharing and brake * MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 62 10 bit (+ sign) Accuracy of analog inputs Max. error 0.5% of full scale Bandwidth : 200 Hz The analog inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 63 Max. capacitive load at frequency output 10 nF Minimum output frequency at frequency output 0 Hz Maximum output frequency at frequency output 32 kHz Accuracy of frequency output Max. error: 0.1% of full scale MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 64 : ≤ 2 ms Speed control range (open-loop) 1:100 of synchronous speed Speed accuracy (open-loop) 30-4000 rpm: Maximum error of ±8 rpm All control characteristics are based on a 4-pole asynchronous motor MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 65 The USB connection is not galvanically isolated from protection ground. Use only isolated laptop/PC as connection to the USB connector on VLT HVAC Drive or an isolated USB cable/drive. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 66 ) is multiplied by the efficiency of the motor (η MOTOR η ) = η x η SYSTEM MOTOR Calculate the efficiency of the system at different loads based on the graph below. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 67 When a transistor in the inverter bridge switches, the voltage across the motor in- creases by a du/dt ratio depending on: the motor cable (type, cross-section, length, shielded or unshielded) inductance MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 68 In enclosure A, the length of the motor cable has a relatively high impact on the recommended derating. Therefore, the recommended derating for an application with max. 32 ft. [10 m] motor cable is also shown. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 69 (110% over-torque) 3.5.3. Derating for Low Air Pressure The cooling capability of air is decreased at a lower air pressure. At altitudes higher than 6,600 feet [2 km], please contact Danfoss Drives regarding PELV. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 70 3.9: Derating of output current versus altitude at T . At altitudes higher than 6,600 feet [2 km], please AMB, MAX contact Danfoss Drives regarding PELV. An alternative is to lower the ambient temperature at high altitudes and thereby ensure 100% output current at high altitudes.
  • Page 71 The capability to automatically reduce the output current extends the acceptable operating conditions even further. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 72 0.35 in [9 mm] 0.35 in [9 mm] 0.35 in [9 mm] 11.7 lbs [5.3 15.4 lbs [7.0 29.8/31.3 lbs Max weight 10.8 lbs [4.9 kg] 14.6 lbs [6.6 kg] [13.5/14.2 kg] MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 73 0.35 in [9 mm] 0.35 in [9 mm] 0.69 in [17.6 mm] 0.71 in [18 mm] Max weight 50.7 lbs [23 kg] 59.5 lbs [27 kg] 94.8 lbs [43 kg] 134.5 lbs [61 kg] MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 74 HVAC Drive Design Guide 3.6. Options and Accessories Danfoss offers a wide range of options and accessories for the VLT adjustable frequency drives. 3.6.1. Mounting Option Modules in Slot B The power to the adjustable frequency drive must be disconnected.
  • Page 75 If digital inputs 7, 8 or 9 are to be switched using the internal 24 V power supply (terminal 9), the connection between terminal 1 and 5 illustrated in the drawing has to be established. 3.10: Principle Diagram MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 76 3.6.6. Analog outputs - Terminal X30/5+8 Parameters for set-up: 6-6* and 16-77 Number of analog outputs Output signal level Tolerance Max. load 0/4 - 20 mA ± 0.1 mA < 500 ohm MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 77 • Select the relay functions in par. 5-40 [6-8], 5-41 [6-8] and 5-42 [6-8]. NB (Index [6] is relay 7, index [7] is relay 8, and index [8] is relay 9) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 78 3. VLT HVAC Selection ® HVAC Drive Design Guide Do not combine low voltage parts and PELV systems. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 79 When MCB 107, 24 V backup option is sup- plying the control circuit, the internal 24 V supply is automatically disconnected. 3.12: Connection to 24 V back-up supplier (A5- C2). 3.11: Connection to 24 V back-up supplier (A2- A3). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 80 Ni1000 temperature sensor of 1000 Ω at 32° F [0° C]. Specifications according to DIN43760 • Pt1000 temperature sensor of 1000 Ω at 32° F [0° C]. Specifications according to IEC 60751 3 x analog outputs supplying 0-10 VDC. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 81 1% of full scale 1 mA Analog outputs are scalable by parameters for each output. The function assigned is selectable via a parameter and has the same options as for analog outputs on the control card. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 82 Brake resistors are used to dissipate the excess energy resulting from the regenerative braking. The resistor is selected in respect to its ohmic value, its power dissipation rate and its physical size. Danfoss offers a wide verity of different resistors that are specially designed for our How to order drives.
  • Page 83 C at the bottom of the drive and use the clamps from the accessory bag to correctly fasten the cables. Holes for cable glands: Size A2: 2x M25 and 3xM32 Size A3: 3xM25 and 3xM32 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 84 Sine-wave filters enable use of longer motor cables in applications where the motor is installed far from the drive. The length is unfortunately limited because the filter does not reduce leakage currents in the cables. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 85 The drive configurator will automatically generate an eight-digit sales number to be delivered to your local sales office. Furthermore, you can establish a project list with several products and send it to a Danfoss sales representative.
  • Page 86 4. How to Order ® HVAC Drive Design Guide 4.1.2. Type Code String Description Possible choice Product group & VLT Series FC 102 Power rating 8-10 1.5-125 hp [1.1-90 kW] (1K1-90K) Number of phases Three phases (T) T 2: 200-240 V AC...
  • Page 87 Accessory bag C2 Accessory bag, frame size C2 130B0047 4.2: 1) Only IP 21 / > 14.75 HP [11 kW] Options can be ordered as factory built-in options; see ordering information. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 88 4. How to Order ® HVAC Drive Design Guide For information on serial communication bus and application option compatibility with older soft- ware versions, please contact your Danfoss supplier. 4.2.2. Ordering Numbers: Harmonic Filters Harmonic filters are used to reduce line harmonics. •...
  • Page 89 130B2318 130B2292 1200 A P630 P710 2 kHz 60 Hz 130B2318 130B2292 1200 A NOTE When using sine-wave filters, the switching frequency should comply with filter Switching Frequency specifications in par. 14-01 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 90 130B2340 1320 A P970 P1M2 1.5 kHz 60 Hz 130B2384 130B2340 1320 A NOTE When using sine-wave filters, the switching frequency should comply with filter Switching Frequency specifications in par. 14-01 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 91 1500 A 1340 hp [1000 1070 hp [800 kW] 2 kHz 60 Hz 130B2407 130B2394 1500 A 1340 hp [1000 1475 hp [1100 2 kHz 60 Hz 130B2410 130B2395 2300 A MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 92 1350 A 1340 hp [1000 1100 hp [820 kW] 2 kHz 60 Hz 130B2431 130B2422 1350 A 1600 hp [1200 1300 hp [970 kW] 2 kHz 60 Hz 130B2431 130B2422 1350 A MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 93 101/301 units. For DC link connection (load sharing), connector 1 can be ordered separately (code no. 130B1064). An eight-pole connector is included in the accessory bag for the FC 101/301 without Safe Stop. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 94 The service life of the adjustable frequency drive is reduced if derating for ambient temperature is not taken into account. 5.1.4. Field Mounting For field mounting, the IP 21/IP 4X top/TYPE 1 kits or IP 54/55 units (planned) are recommended. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 95 (terminal 95). Use the screw from the accessory bag. Place plug connector 91, 92, 93 from the accessory bag onto the terminals labeled LINE at the bottom of the adjustable frequency drive. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 96 440 V. For IT lines and delta ground (grounded leg), line voltage may exceed 440 V be- tween phase and ground. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 97 Insert terminals 96 (U), 97 (V), 98 (W) and motor cable to terminals labeled MOTOR. Fasten shielded cable to the decoupling plate with screws and washers from the acces- sory bag. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 98 In motors without phase insulation paper or other insulation reinforcement suitable for operation with voltage supply (such as an adjustable frequency drive), fit a sine- wave filter on the output of the adjustable frequency drive. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 99 Aluminum conductors are not recommended. Terminals can accept aluminum conductors, but the conductor surface has to be clean, oxidation must be removed, and the area must be sealed by neutral acid-free Vaseline grease before the conductor is connected. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 100 The adjustable frequency drive must be protected against short circuit in order to avoid electrical or fire hazard. Danfoss recommends using the fuses mentioned in tables 4.3 and 4.4 in order to protect service personnel and equipment in case of an internal failure in the unit. The adjustable frequency drive provides full short circuit protection in case of a short circuit in the motor output.
  • Page 101 380-500 V type aR 250A 380-500 V type aR 250A 5.2: Non-UL fuses 200 V to 500 V 1) Max. fuses - refer to national/international regulations to select an appropriate fuse size. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 102 A6KR fuses from FERRAZ SHAWMUT may substitute for A2KR in 240 V adjustable fre- quency drives. A50X fuses from FERRAZ SHAWMUT may substitute for A25X in 240 V adjustable fre- quency drives. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 103 5.13: A5, B1, B2, C1 and C2 enclosures 5.12: A1, A2 and A3 enclosures 5.2.9. Control Terminals Drawing reference numbers: 10-pole plug, digital I/O. 3-pole plug, RS-485 bus. 6-pole, analog I/O. USB Connection. 5.14: Control terminals (all enclosures) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 104 Insert a screw driver in the square hole. Pull out the cable. Max. 0.015 x 0.1 in. [0.4 x 2.5 mm] Assembling of IP55 / NEMA TYPE 12 housing with line power disconnector MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 105 Connect terminals 18 and 27 to +24 V (terminal 12/13) Default settings: 18 = latched start 27 = stop inverse 5.15: Terminal 37 available with Safe Stop Func- tion only! MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 106 (terminal 20, 55, 39) to avoid ground currents from both groups to affect other groups. For example, switching on the digital input may disturb the analog input signal. NOTE Control cables must be shielded/armored. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 107 69). Diagram showing all electrical See drawing terminals in section Electrical Installation. Default setting: S201 (A53) = OFF (voltage input) S202 (A54) = OFF (voltage input) S801 (Bus termination) = OFF MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 108 AMA, or remove the LC filter during the AMA procedure. Press the [OK] key. The display shows “Press [Hand on] to start.” Press the [Hand on] key. A progress bar indicates if the AMA is in progress. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 109 "Report Value” in the [Alarm Log] shows the last measuring sequence carried out by the AMA before the adjustable frequency drive entered alarm mode. This number, along with the description of the alarm, will assist you in troubleshooting. If you contact Danfoss Service, make sure to mention both the number and the alarm description.
  • Page 110 The DC bus terminal is used for DC back-up, with the intermediate circuit being supplied from an external source. Terminal numbers: 88, 89 Please contact Danfoss if you require further information. 5.4.2. Brake Connection Option The connection cable to the brake resistor 81 82 Brake resistor must be shielded/armored.
  • Page 111 HVAC Drive Design Guide 5. How to Install Terminals for relay connection Terminals for relay connection (A2 and A3 enclosures). (A5, B1 and B2 enclosures). 5.17: Terminals for relay connection (C1 and C2 enclosures). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 112 Terminal 05: normal open 400 V AC • Terminal 06: normal closed 240 V AC Relay 1 and relay 2 are programmed in par. 5-40, 5-41, and 5-42. Additional relay outputs by using option module MCB 105. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 113 Pro- vide further motor protection with, for exam- ple, thermistors in each motor or individual thermal relays (circuit breakers are not a suit- able means of protection). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 114 The RS-485 bus must be terminated by a resistor network at both ends. For this purpose, set switch S801 on the control card to "ON". Switches S201, S202, and S801 For more information, see the paragraph MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 115 All drives are equipped with a serial communication port. We provide a PC tool for communication between PC and adjustable frequency drive, called the VLT Motion Control Tool MCT 10 Set-up software. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 116 All parameter settings are now transferred to the drive. A separate manual for MCT 10 Set-up software is available. The MCT 10 Set-up Software Modules The following modules are included in the software package: MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 117 The MCT 31 harmonic calculation PC tool enables easy estimation of the harmonic distortion in a given application. Both the harmonic distortion of Danfoss adjustable frequency drives as well as non-Danfoss adjustable frequency drives with different additional harmonic reduction devices, such as Danfoss AHF filters and 12-18-pulse rectifiers, can be calculated.
  • Page 118 If the installation is not carried out according to the guidelines, and if non-shielded cables and control wires are used, some emission requirements will not be fulfilled, although the immunity EMC test results requirements will be. See the paragraph MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 119 5.18: EMC-compliant electrical installation of an adjustable frequency drive in a cabinet. 5.7.2. Use of EMC-Compliant Cables Danfoss recommends braided shielded/armored cables to optimize EMC immunity of the control cables and the EMC emission from the motor cables. The ability of a cable to reduce the in and outgoing radiation of electric noise depends on the transfer impedance (Z ).
  • Page 120 Twisted copper wire or armored steel wire cable. 1 Single-layer braided copper wire with varying percentage shield cov- erage. This is the typical Danfoss reference cable.1 Double-layer braided copper wire.1 Twin layer of braided copper wire with a magnetic, shielded/armored intermediate layer.1...
  • Page 121 61. This ter- minal is grounded via an internal RC link. Use twisted-pair cables to re- duce the differential mode interfer- ence between the conductors.1 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 122 5.9.1. Residual Current Device You can use RCD relays, multiple protective grounding or grounding as extra protection, provided that local safety regulations are complied with. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 123 If RCD relays are used, you must observe local regulations. Relays must be suitable for protection of 3-phase equipment with a bridge rectifier and for a brief discharge on power-up see section Ground Leakage Current for further information. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 124 6. Application Examples ® HVAC Drive Design Guide MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 125 Stop inverse Terminal 27= Stop par. 5-12 [6] Digital Input Latched Par. 5-10 start Digital Input Stop in- Par. 5-12 verse 6.2: Terminal 37: Available only with Safe Stop Function! MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 126 AMA, it is imperative that the application does not force the motor shaft to run, which is known to happen with windmilling in ventilation systems, for example. This disturbs the AMA function. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 127 6.1.7. SLC Application Example One sequence 1: Start – ramp-up – run at reference speed 2 sec – ramp-down and hold shaft until stop. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 128 Set Action 2 in par. 13-52 [2] to [29] Select preset 1 Set Action 3 in par. 13-52 [3] to [11] Set Action 4 in par. 13-52 [4] to No Action MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 129 The motors must be of equal size. The BASIC Cascade Controller allows the adjustable frequency drive to control up to 3 equal size pumps using the drive's two built-in relays. When the variable MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 130 (fmax). When the speed of the lead pump reaches the de-staging fre- quency, the fixed speed pump will be cut out (de-staged). The lead pump continues to ramp up, then ramps down to a stop, and the two relays are cut out. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 131 • De-staging at No-Flow ensures that all fixed speed pumps are stopped individually until the no-flow status disappears. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 132 K1 blocks K2 via the mechanical interlock, preventing line power to be connected to the output of the adjustable frequency drive (via K1). • Auxiliary break contact on K1 prevents K3 from cutting in. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 133 De-staging (if running) mal stop command) or stays in operation if already running. Ramps down Ramps down Auto On Starts and stops according to Staging/De-staging commands via terminals or se- rial bus. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 134 7. RS-485 Installation and Set-up ® HVAC Drive Design Guide MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 135 Connect signal wires to terminal 68 (P+) and terminal 69 (N-) on the main control board of the adjustable frequency drive. Connect the cable shield to the cable clamps. NOTE Shielded, twisted-pair cables are recommended in order to reduce noise between conductors. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 136 Use the terminator DIP switch on the main control board of the adjustable frequency drive to terminate the RS-485 bus. Terminator Switch Factory Setting NOTE The factory setting for the DIP switch is OFF. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 137 When crossing is unavoidable, the RS-485 cable must cross motor and brake resistor cables at an angle of 90 degrees. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 138 HVAC Drive Design Guide 7.2. FC Protocol Overview The FC protocol, also referred to as FC bus or Standard bus, is the Danfoss Drives standard serial communication bus. It defines an access technique according to the master-slave principle for communications via a serial bus.
  • Page 139 1’s in the 8 data bits and the parity bit in total). A character is completed by a stop bit, thus consisting of 11 bits in all. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 140 The slave returns the address byte unchanged to the master in the response telegram. 7.4.5. Data Control Byte (BCC) The checksum is calculated as an XOR-function. Before the first byte in the telegram is received, the calculated checksum is 0. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 141 The text block is used to read or write texts via the data block. 7.4.7. The PKE Field The PKE field contains two sub-fields: Parameter command and response AK, and parameter number PNU: MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 142 Command cannot be performed text transferred If the command cannot be performed, the slave sends this response: 0111 Command cannot be performed - and issues the following fault report in the parameter value (PWE): MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 143 (read), the length of the telegram is variable, and the texts are of different lengths. The message length is defined in the second byte of the telegram, LGE. When using text transfer, the index character indicates whether it is a read or a write command. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 144 To preset the minimum frequency to 10 Hz, 0.001 transfer the value 100. A conversion factor of 0.0001 0.1 means that the value transferred is multi- 0.00001 plied by 0.1. The value 100 is thus perceived as 10.0. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 145 PWEHIGH = 0000 Hex PWELOW = 0000 Hex Ramp 1 Up Time If the value in par. 3-41 is 10 s, the response from the slave to the master will be: MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 146 The VLT HVAC adjustable frequency drive communicates in Modbus RTU format over the built-in RS-485 interface. Modbus RTU provides access to the control word and bus reference of the ad- justable frequency drive. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 147 The controllers are set up to communicate on the Modbus network in RTU (Remote Terminal Unit) mode, with each 8-bit byte in a message containing two 4-bit hexadecimal characters. The format for each byte is shown below. Start bit Data bit Stop Stop parity MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 148 When the slave sends its response, it places its own address in this address field to let the master know which slave is responding. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 149 Holding register 40001 is addressed as register 0000 in the data address field of the message. The function code field already specifies a ‘holding register’ operation. Therefore, the ‘4XXXX’ reference is implicit. Holding register 40108 is addressed as register 006BHEX (107 decimal). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 150 Not used No voltage warn- Voltage warning Adjustable frequency drive control word (FC profile) Not in current Current limit limit No thermal Thermal warning warning Adjustable frequency drive status word (FC profile) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 151 Write single coil 5 hex Write single register 6 hex Write multiple coils F hex Write multiple registers 10 hex Get comm. event coun- B hex Report slave ID 11 hex MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 152 The PNU (Parameter Number) is translated from the register address contained in the Modbus read or write message. The parameter number is translated to Modbus as (10 x parameter num- ber) DECIMAL. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 153 Exception Codes section. 7.10.1. Read Coil Status (01 HEX) Description This function reads the ON/OFF status of discrete outputs (coils) in the adjustable frequency drive. Broadcast is never supported for reads. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 154 Example (HEX) Slave Address 01 (adjustable frequency drive address) Function 01 (read coils) Byte Count 02 (2 bytes of data) Data (Coils 40-33) Data (Coils 48-41) 06 (STW=0607hex) Error Check (CRC) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 155 The normal response is an echo of the query, which is returned after the coil state has been forced. Field Name Example (HEX) Slave Address Function Force Data HI Force Data LO Quantity of Coils HI Quantity of Coils LO Error Check (CRC) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 156 01 (adjustable frequency drive address) Function 0F (write multiple coils) Coil Address HI Coil Address LO 10 (coil address 17) Quantity of Coils HI Quantity of Coils LO 10 (16 coils) Error Check (CRC) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 157 Slave Address Function Byte Count Data HI (Register 40001) Data LO (Register 40001) Data HI (Register 40002) Data LO (Register 40002) Data HI (Register 40003) Data LO (Register 40003) Error Check (CRC) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 158 Response: the normal response is an echo of the query, which is returned after the register con- tents have been passed. Field Name Example (HEX) Slave Address Function Register Address HI Register Address LO Preset Data HI Preset Data LO Error Check (CRC) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 159 The normal response returns the slave address, function code, starting address and quantity of preset registers. Field Name Example (HEX) Slave Address Function Starting Address HI Starting Address LO No. of Registers HI No. of registers LO Error Check (CRC) MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 160 7. RS-485 Installation and Set-up ® HVAC Drive Design Guide 7.11. Danfoss FC Control Profile 7.11.1. Control Word According to FC Profile (Par. 8-10 = FC profile) Bit value = 0 Bit value = 1 Reference value external selection lsb...
  • Page 161 Bit 07, Reset: Bit 07 = ’0’: No reset. Bit 07 = ’1’: Resets a trip. Reset is activated on the leading edge of the signal, i.e., when changing from logic ’0’ to logic ’1’. Bit 08, Jog: Bit 08 = ’1’: The output frequency is determined by par. 3-19 Jog Speed MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 162 Bit 15 = ’0’: No reversing. Bit 15 = ’1’: Reversing. In the default setting, reversing is set to digital in par. 8-54 Reversing Select . Bit 15 causes reversing only when Ser. communication, Logic or or Logic and is selected. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 163 Bit 04, No error/error (no trip): Bit 04 = ’0’: The adjustable frequency drive is not in fault mode. Bit 04 = “1”: The adjustable frequency drive shows an error but does not trip. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 164 Bit 15, Timer OK/limit exceeded: Bit 15 = ’0’: The timers for motor thermal protection and VLT thermal protection have not excee- ded 100%. Bit 15 = ’1’: One of the timers exceeds 100%. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 165 2’s complement. The Actual Output frequency (MAV) is scaled in the same way as the bus reference. The reference and MAV are scaled as follows: MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 166 8. Troubleshooting ® HVAC Drive Design Guide MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 167 After an alarm or trip, the motor carries on coasting, and the alarm and warning flash on the adjustable frequency drive. Once the problem has been rectified, only the alarm continues flashing. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 168 Option Configuration Has Changed Safe Stop Activated Drive Initialized to Default Value 8.1: Alarm/Warning code list (X) Dependent on parameter LED indication Warning yellow Alarm flashing red Trip-locked yellow and red MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 169 The adjustable frequency drive is still active. WARNING/ALARM 4, Line phase loss: A phase is missing on the supply side, or the line voltage imbalance is too high. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 170 You cannot reset the adjustable frequency ALARM 15, Incomplete hardware: drive until the counter is below 90%. A fitted option is not handled by the present control board (hardware or software). MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 171 The adjustable frequency drive is still able to The serial communication bus on the commu- run, but since the brake transistor has short- nication option card is not working. MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 172 8. Troubleshooting ® HVAC Drive Design Guide ALARM 38, Internal fault: WARNING 62, Output Frequency at Contact your local Danfoss supplier. Maximum Limit: The output frequency is limited by the value WARNING 47, 24 V supply low: set in par. 4-19...
  • Page 173 Block Diagram Of The Drive’s Closed-loop Controller Brake Connection Option Brake Function Brake Resistor Brake Resistors Braking Energy 10, 53 Braking Time Branch Circuit Protection Break-away Torque Building Management System Bypass Frequency Ranges Cable Clamp MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 174 Derating For Installing Long Motor Cables Or Cables With Larger Cross-section Derating For Low Air Pressure Derating For Running At Low Speed Devicenet Differential Pressure Digital Inputs: Digital Output Direction Of Motor Rotation Disposal Instructions Drive Configurator Du/dt Filters Efficiency MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 175 How To Connect A Pc To The Fc 100 I/os For Setpoint Inputs Igvs Installation At High Altitudes Intermediate Circuit 52, 53, 67, 68, 169 Ip 21/ip 4x/ Type 1 Enclosure Kit MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 176 Motor Rotation Motor Thermal Protection Motor Thermal Protection 54, 114 Motor Voltage Motor-generated Overvoltage Mounting Of Decoupling Plate Multiple Feedback Signals Multiple Pumps Multi-zone Control Multi-zone, Multi-setpoint Multi-zone, Single Setpoint Nameplate Data MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 177 Protection And Features Pt1000 Temperature Sensor Pulse Inputs Pulse Start/stop Pump Characteristics Pump Impeller Radiated Emission Rated Motor Speed 11, 51 Real-time Clock (rtc) Reference Handling Reference/feedback Unit Refrigerant Refrigerant A1 Refrigerant A2 MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 178 Switches S201, S202, And S801 Switching Frequency Switching On The Output System Status And Operation The Emc Directive (89/336/eec) The Low-voltage Directive (73/23/eec) The Machinery Directive (98/37/eec) Thermistor Throttling Valve Torque Characteristics Transmitter/sensor Inputs MG.11.B4.22 - VLT ® is a registered Danfoss trademark.
  • Page 179 Variable Control Of Flow And Pressure Varying Flow Over 1 Year Vibration And Shock Vibrations Voltage Level Vvcplus Warning Against Unintended Start What Is Ce Conformity And Labeling? What Is Covered Ziegler Nichols Tuning Method MG.11.B4.22 - VLT ® is a registered Danfoss trademark.

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