Danfoss VLT 2800 Series Operating Instructions Manual
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Danfoss VLT 2800 Series Operating Instructions Manual

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Contents
MG.28.A5.02 - VLT is a registered Danfoss trade mark
Software version ...................................................................................................... 3
General warning ...................................................................................................... 4
These rules concern your safety ............................................................................. 4
Warning against unintended start ........................................................................... 4
Control unit .............................................................................................................. 5
................................................................................................. 5
Hand Auto ................................................................................................................ 6
Automatic motor tuning ............................................................................................ 7
....................................................................................................... 8
Operation & Display ................................................................................................. 8
Load and Motor ..................................................................................................... 15
References & Limits .............................................................................................. 24
Inputs and outputs ................................................................................................. 31
Special functions .................................................................................................... 40
.......................................................................................................... 48
Mechanical dimensions ......................................................................................... 48
Mechanical installation ........................................................................................... 50
General information about electrical installation ................................................... 51
EMC-correct electrical installation ......................................................................... 52
Electrical installation .............................................................................................. 53
Safety clamp .......................................................................................................... 56
Pre-fuses ................................................................................................................ 56
Mains connection ................................................................................................... 56
Motor connection ................................................................................................... 56
Direction of motor rotation ..................................................................................... 57
Parallel connection of motors ................................................................................ 57
Motor cables .......................................................................................................... 57
Motor thermal protection ....................................................................................... 57
Brake connection ................................................................................................... 58
Earth connection .................................................................................................... 58
Load sharing .......................................................................................................... 58
Control of mechanical brake .................................................................................. 58
Access to control terminals ................................................................................... 59
Electrical installation, control cables ...................................................................... 59
Electrical installation, controlterminals .................................................................. 61
Relay connection ................................................................................................... 61
VLT Software Dialog .............................................................................................. 61
Connection examples ............................................................................................ 63
......................................................................................... 65
Order form ............................................................................................................. 65
Display readout ...................................................................................................... 66
Warnings/alarm messages .................................................................................... 66
Warning words, extended status words and Alarm words .................................... 70
Special conditions .................................................................................................. 71
Temperature-dependentswitch frequency .............................................................. 71
GalvanicIsolation (PEL V) ....................................................................................... 72
EMC emission ........................................................................................................ 72
®
VLT
2800 Series
............................................................................... 3
1

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Summary of Contents for Danfoss VLT 2800 Series

  • Page 1: Table Of Contents

    Warnings/alarm messages ..................66 Warning words, extended status words and Alarm words ........70 Special conditions ....................71 Temperature-dependentswitch frequency .............. 71 GalvanicIsolation (PEL V) ..................72 EMC emission ......................72 MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 2 Technical data, mains supply 1 x 220 - 240 V / 3 x 200-240V ......79 Technical data, mains supply 3 x 380 - 480 V ............80 Available literature ....................81 Supplied with the unit .................... 81 Factory Settings ..................... 82 MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 3: Introduction To Vlt 2800

    Series frequency converters with software version 2.3x. The software version number can be seen from parameter 640 Software version no. NB!: Indicates a high-voltage warning. Indicates something to be noted by the reader. Indicates a general warning. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 4: General Warning

    Also ensure that other voltage inputs are disconnected from load sharing, for example (sharing of DC intermediate circuit). For VLT 2800: wait at least 4 minutes. 195NA139.10 MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 5: Control Unit

    See also [QUICK MENU] + [+]. [CHANGE DATA] is used for changing a setting. The [CHANGE DATA] key is also used for confirming a change of parameter settings. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 6: Hand Auto

    However, in Hand mode, it is possible to give the ref- erence signal locally via the control panel. If for a given parameter the display shows three dots at the right, it means that the parameter value has MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 7: Automatic Motor Tuning

    When the frequency converter is in Hand mode the readout will be like: and the reference can be changed by using the fol- lowing keys: NB!: Please note, that parameter 020 may block the choice of mode. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 8: Programming

    Local control and open loop [1] or Local rial communication. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 9 (COPY TO SETUP 4) Copy to all Setups from # (COPY TO ALL) = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 10 Analog input 60 [mA] (ANALOG INPUT 60 [MA]) = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 11 Control word [Hex] gives the control word for the fre- quency converter. See Serial communication in the Design Guide for further information. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 12 Local control as parameter 100 [3] is used when the motor speed is to be set via parameter 003 Local = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 13 Forced stop, set ref. to 0 [2] is selected if the fre- quency converter is to remain stopped when the = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 14: Hand Mode

    If not active [0] is selected, the standard setup of the Quick Menu key is active. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 15: Load And Motor

    (TORQUE: MED) Variable torque high (TORQUE: HIGH) Variable torque low with CT start = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 16: Motor Current

    Automatic motor tuning is an algorithm that mea- sures stator resistance R without the motor axle = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 17 The procedure for AMT controlled from the SLCP: See section entitled Control unit. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 18 (DC BRAKE/DELA Y TIME) motor is applied. The cone anchor motor can break = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 19: Dc Brake Time

    132 DC brake voltage is to be active. speeds due to the motor’s internal ventilation be- ing reduced. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 20: Dc Brake Voltage

    Certain motors, such as conical anchor motors, need an extra voltage/start frequency = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 21: Load Compensation

    If this value is set too high, the frequency converter may cut out because of overcurrent. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 22: Brake Cut In Frequency

    Automatic (AUTOMA TIC) Always switched on (ALWA YS ON) Always switched off (ALWA YS OFF) = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 23: 144 Gain Ac Brake

    146 Reset voltage vector (RESET VECTOR) Value: *Off (OFF) Reset (RESET) = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 24: References & Limits

    1/10 of the switching frequency (parameter 411 Switching frequency). = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 25 Description of choice: Select the required ramp type depending on the re- quired acceleration/deceleration process. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 26: Jog Ramp Time

    ) to 0 Hz, provided no overvoltage arises in the inverter because of generating opera- tion of the motor. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 27: Jog Frequency

    It is possible to define how preset references are to be added to the other references; for this purpose, = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 28: Catch Up

    The warning functions are activated when the output frequency has reached = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 29 46 and via the relay output. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 30 Enter the frequencies to be avoided. See also pa- rameter 229 Frequency bypass, bandwidth. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 31: Inputs And Outputs

    = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 32: Digital Inputs

    (in Hz). The output frequency can now only be changed via Speed up and Speed down. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 33 Precise stop, inverse is selected to obtain a high de- gree of accuracy when a stop command is repeated. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 34: Analogue Input

    60, min. scaling and parameter 316 Terminal be added up. 60, max. scaling. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 35: Analogue Output

    50 % of the minimum scaling for a period (0-FMAX = 0-20 MA) = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 36 The output is activated (1–2 make) when a given condition is fulfilled. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 37 228 Warning: High current, I HIGH = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 38: Canopen

    Counter stop without reset rameter 343). (COUNT STOP NO RESET) Speed-compensated stop (SPD CMP STOP) = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 39 NB!: Only active for speed-compensated stop. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 40: Special Functions

    = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 41: Feedback

    Set the value to be shown on the display when the cannot protect the LC-filter. maximum feedback has been obtained on the se- = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 42 009-012 Display read-out, and in Display mode. The unit is used in Closed loop also as a unit = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 43 This might be an advantage, e.g. if there is a great amount of noise on the signal. See drawing. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 44 100 Configuration a selection has been made of Process regulation, closed loop. [3]. = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 45: Process Pid

    = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 46 OK - both directions (OK-BOTH DIRECTIONS) DC brake and start (DC-BRAKE BEF. START) = factory setting. () = display text [] = value for use in communication via serial communication port MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 47: Brake Voltage Reduce

    600 Service functions are not included in tion, closed loop. The FF function sends a larger or this manual. Please contact Danfoss and ask for the smaller part of the reference signal outside the PID VLT 2800 Design Guide.

  • Page 48: Installation

    The drawings below give the mechanical dimen- VLT 2855-2875 380-480 Volt sions. All dimensions are in mm. VLT 2803-2815 200-240 Volt VLT 2805-2815 380-480 Volt VLT 2822 200-240 Volt VLT 2880-82 380-480V VLT 2822-2840 380-480 Volt MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 49 ® 2800 Series Terminal cover The drawing below gives the dimensions for NEMA 1 terminal covers for VLT 2803-2875. Dimension ’a’ depends on the unit type. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 50: Mechanical Installation

    IP 20 is not suitable for remote on the side. mounting. In some countries, e.g. in the USA, units with enclosure NEMA 1 are approved for remote mounting. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 51: General Information About Electrical Installation

    In order to achieve a low HF-impedance, the fastening bolts of the units can be used as HF- connection to the backplate. It is necessary to remove any layers of isolating paint or similar from the attachment points. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 52: Emc-Correct Electrical Installation

    Use cable clamps instead. The illustration below shows EMC-correct electrical installation, in which the frequency converter has been fitted in an installation cabinet and connected to a PLC. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 53: Electrical Installation

    ® 2800 Series Electrical installation VLT 2803-2815 200-240 V, 2805-2815 380-480 V MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 54 ® 2800 Series VLT 2822 200-240 V, 2822-2840 380-480 V VLT 2840 200-240 V, 2855-2875 380-480 V MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 55 ® 2800 Series VLT 2880-82 380-480V Please note, that the units will be supplied with two bottom plates; one for metric glands and one for conduits. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 56: Safety Clamp

    No. 91 92 93 Mains voltage 3 x 380-480 V L1 L2 L3 No. 95 Earth connection NB!: Please check that the mains voltage fits the mains voltage of the frequency converter, which can be seen from the nameplate. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 57: Direction Of Motor Rotation

    ETR Trip and the maximum rated output current I for the fre- parameter 105 Motor current, I has been pro- M, N quency converter. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 58: Brake Connection

    AC coils (see drawing below). For load sharing parameter 400 Brake function must be set to Load sharing [5]. Contact Danfoss or see instructions no. MI.50.N1.02 for further information. No. 88 89 Loadsharing MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 59: Access To Control Terminals

    In this connection, it may be necessary to break the screen and possibly insert a 100 nF ca- pacitor between the screen and the chassis. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 60 ® 2800 Series MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 61: Electrical Installation, Controlterminals

    Sub D plug See parameter 323 Relay output for programming of relay output. Nr. 01 - 02 1 - 2 make (normally open) - 03 1 - 3 break (normally closed) MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 62 An LCP2 control unit can be connected to the Sub D plug on the control card. Ordering number: 175N0131. LCP control unit with ordering number 175Z0401 is not to be connected. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 63: Connection Examples

    Par. 304 Digital input = Coasting stop inverted [2] Par. 305 Digital input = Jog [13] Par. 314 Analog input = Feedback [2] Par. 315 Terminal 60, min. scaling = 4 mA MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 64 ® 2800 Series Par. 316 Terminal 60, max. scaling = 20 mA MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 65: All About Vlt 2800

    ® 2800 Series Order form MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 66: Display Readout

    If an LCP2 control unit is fitted you can be ready to start operation again. only change parameters with that. The frequency converter shows the present Hand mode reference frequency in Herz (Hz). MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 67 Note: The frequency converter will trip with an than Voltage warning high the frequency converter alarm 5 (undervoltage). A voltage warning can occur will give a warning and the motor will continue to run MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 68 OFF. If parame- ter 804 Bus timeout function is set to Stop and trip, it will first give a warning and then ramp down and trip MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 69 Alarm 37, internal fault number 0: Communication fault between control card and BMC. Alarm 38, internal fault number 1: Flash EEPROM fault on control card. Alarm 39, internal fault number 2: RAM fault on con- trol card MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 70: Warning Words, Extended Status Words And Alarm Words

    000010 Catch-up 000020 Feedback high 000040 Feedback low 000080 Output current high 000100 Output current low 000200 Output frequency high 000400 Output frequency low 002000 Braking 008000 Out of frequency range MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 71: Special Conditions

    Too many dust particles are typically observed on top of instal- lation cabinets and on existing electrical installations. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 72: Galvanicisolation (Pelv)

    LCP2 with cable. other. Serial communication connected to fieldbus is galvanically insulated from the control terminals, al- though this is only a functional insulation. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 73 30 MHz - 1 GHz 400 V version with 1B RFI filter 1. For VLT 2822-2840 3 x 200-240 V the same values apply as for the 400 V version with 1A RFI filter. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 74: Ul Standard

    Class 1A: Equipment used in an industrial environment. Class 1B: Equipment used in areas with a public supply net- work (residential, commerce and light industry). UL Standard This device is UL-approved. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 75: General Technical Data

    (terminals 18, 19, 27, 29) ................. approx. 4 k Input resistance, R (terminal 33) ..................... approx. 2 k All digital inputs are galvanically isolated from the supply voltage (PEL V) and other high-voltage terminals. See section entitled Galvanic Isolation. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 76 Accuracy on frequency output ................Max. error: 0.2 % of full scale Resolution on frequency output ........................10 bit The digital output is galvanically isolated from the supply voltage (PEL V) and other high-voltage terminals. See section entitled Galvanic Isolation. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 77 Max. cross section to control cables, cable with enclosed core ..........0.5 mm /20 AWG When complying with EN 55011 1A and EN 55011 1B the motor cable must in certain instances be re- duced. See EMC emission. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 78 • Monitoring of the intermediate circuit voltage ensures that the frequency converter cuts out if the intermedi- ate circuit voltage is too low or too high. • The frequency converter is protected against earth fault on motor terminals U, V, W. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 79: Technical Data, Mains Supply 1 X 220 - 240 V / 3 X 200-240V

    RMS (symmetrical), 500 V maximum. 3. Measured using a 25 m screened/armoured mo- tor cable with a rated load and rated frequency. 4. IP20 is standard for VLT 2805-2875, whereas NEMA 1 is an option. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 80: Technical Data, Mains Supply 3 X 380 - 480 V

    Ferraz Shawmut, type ATMR (max. 30A). The fuses must be placed for protection in a circuit that is capable of supplying a maximum of 100,000 amps RMS (symmetrical), 500 V maximum. MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 81: Available Literature

    LCP remote-mounting kit ........................MI.56.AX.51 Filter instruction ..........................MI.28.B1.02 Communication with VLT 2800: Profibus manual ..........................MG.90.AX.YY VLT 2800 DeviceNet manual ......................MG.90.BX.YY X = version number YY = language version MG.28.A5.02 - VLT is a registered Danfoss trade mark...

  • Page 82: Factory Settings

    This number refers to a conversion figure to be used Unsigned 32 when writing or reading via serial communication Text string with a frequency converter. See Data character in Serial communication. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 83 Brake cut out value 3.0 Hz Brake cut in frequency 3.0 Hz Current, minimum value Leak reactance depends on motor se- lected Internal ventilator control Automatic AC brake factor 1.30 Reset voltage vector MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 84 Warn. Low frequency 0.0 Hz Warn. High frequency 132.0 Hz Warn. Low Feedback -4000.000 Warn.High Feedback 4000.000 Frequency bypass, 0 Hz (OFF) bandwidth Frequency bypass 1 0.0 Hz Frequency bypass 2 0.0 Hz MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 85 This number refers to a conversion figure to be used Unsigned 32 when writing or reading via serial communication Text string with a frequency converter. See Data character in Serial communication. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 86 Off (0.00 s). Proc. PID diff. ampl. limit Proc. PID lowpass filter time 0.02 s Flying start Not possible Speed PID feedforward factor 100% Controller range 10 % Brake voltage reduce MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 87 Data readout: External reference Data readout: Status word Data readout: Inverter temperature Data readout: Alarm word Data readout: Control word Data readout: Warning word Data readout: Extended status word Data readout: Pulse count MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 88 This number refers to a conversion figure to be used Unsigned 32 when writing or reading via serial communication Text string with a frequency converter. See Data character in Serial communication. MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 89 ETR - Electronic ThermalRelay ............Extra protection .......... Parallel connection of motors ..............Pre-fuses ............. Precise stop function ..............Fan control ............Preset reference ..............Feedback ..............Process PID ........Process regulation, closed loop MG.28.A5.02 - VLT is a registered Danfoss trade mark...
  • Page 90 Start torque ..............Start voltage ............Stator reactance ............Stator resistance ..............STOP/RESET ..............Sub D plug ..........................Switching frequency ......Temperature-dependentswitch frequency ..........Thermal motor protection ............. Thermistor 20, 33 MG.28.A5.02 - VLT is a registered Danfoss trade mark...

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