Danfoss VLT 5000 Drive

Danfoss VLT 5000 Drive Fault Codes:

Fault Code and MeaningCause and Remedy
WARNING 1
Under 10 Volts (10 VOLT LOW)
Cause: The 10 Volts voltage from terminal 50 on the control card is below 10 Volts. The 10 Volts supply is overloaded.



Remedy:

  • Remove some of the load from terminal 50 (Max. 17 mA/min. 590 Ω).
WARNING/ALARM 2
Live zero fault (LIVE ZERO ERROR)
Cause: The current signal on terminal 60 is less than 50% of the value set in parameter 315 Terminal 60, min. scaling.



Remedy:

  • Check the signal on terminal 60.

  • Check parameter 315 settings.
WARNING/ALARM 3
No motor (NO MOTOR)
Cause: The motor check function (parameter 122) indicates that no motor has been connected to the output of the frequency converter.



Remedy:

  • Check motor connection.
WARNING/ALARM 4
Phase fault (MAINS PHASE LOSS)
Cause: A phase is missing on the supply side, the mains voltage imbalance is too high, or there is a fault in the input rectifier on the frequency converter.



Remedy:

  • Check the supply voltage.

  • Check supply currents to the frequency converter.
WARNING 5
Voltage warning high (DC LINK VOLTAGE HIGH)
Cause: The intermediate circuit voltage (DC) is higher than the overvoltage limit of the control system. The frequency converter is still active.



Remedy:

  • Check for deceleration regeneration issues.

  • Check supply voltage.
WARNING 6
Voltage warning low (DC LINK VOLTAGE LOW)
Cause: The intermediate circuit voltage (DC) is below the undervoltage limit of the control system. The frequency converter is still active.



Remedy:

  • Check supply voltage quality and level.
WARNING/ALARM 7
Overvoltage (DC LINK OVERVOLT)
Cause: The intermediate circuit voltage (DC) exceeds the inverter overvoltage limit.



Remedy:

  • Connect a brake resistor (if the unit has an integral brake chopper).

  • Extend the time chosen in parameter 410.

  • Activate Brake function/overvoltage control in parameter 400.
WARNING/ALARM 8
Undervoltage (DC LINK UNDERVOLT)
Cause: The intermediate circuit voltage (DC) drops below the inverter lower voltage limit.



Remedy:

  • Check if 24 V power supply is connected.

  • Check whether the supply voltage matches the frequency converter technical data.
WARNING/ALARM 9
Inverter overload (INVERTER TIME)
Cause: The electronic, thermal inverter protection reports that the frequency converter is about to cut out because of an overload (too high current for too long).



Remedy:

  • Reduce load or check application sizing.

  • Wait for the counter to drop below 90% to reset.
WARNING/ALARM 10
Motor overtemperature (MOTOR TIME)
Cause: According to the electronic thermal protection (ETR), the motor is too hot. The counter has reached 100%.



Remedy:

  • Check that motor parameters 102-106 have been set correctly.

  • Check for motor overloading.
WARNING/ALARM 11
Motor thermistor (MOTOR THERMISTOR)
Cause: The thermistor or the thermistor connection has been disconnected.



Remedy:

  • Check that the thermistor has been correctly connected between terminal 53 or 54 (analogue voltage input) and terminal 50 (+ 10 Volts supply).
WARNING/ALARM 12
Torque limit (TORQUE LIMIT)
Cause: The torque is higher than the value in parameter 221 (in motor operation) or the torque is higher than the value in parameter 222 (in regenerative operation).



Remedy:

  • Check load conditions.

  • Adjust torque limit parameters if safe for the application.
WARNING/ALARM 13
Overcurrent (OVERCURRENT)
Cause: The inverter peak current limit (approx. 200% of the rated current) has been exceeded.



Remedy:

  • Turn off the frequency converter and check whether the motor shaft can be turned.

  • Check whether the motor size matches the frequency converter.

  • Reset externally if extended mechanical brake control is selected.
ALARM: 14
Earth fault (Earth fault)
Cause: There is a discharge from the output phases to earth, either in the cable between the frequency converter and the motor or in the motor itself.



Remedy:

  • Turn off the frequency converter.

  • Remove the earth fault in the cable or motor.
ALARM: 15
Switch mode fault (SWITCH MODE FAULT)
Cause: Fault in the switch mode power supply (internal ± 15 V supply).



Remedy:

  • Contact your Danfoss supplier.
ALARM: 16
Short-circuiting (CURR.SHORT CIRCUIT)
Cause: There is short-circuiting on the motor terminals or in the motor itself.



Remedy:

  • Turn off the frequency converter.

  • Remove the short-circuit.
WARNING/ALARM 17
Standard bus timeout (STD BUS TIMEOUT)
Cause: There is no communication to the frequency converter. Only active if parameter 514 is not OFF.



Remedy:

  • Check bus communication cabling.

  • Parameter 513 Bus time interval could possibly be increased.
WARNING/ALARM 18
HPFB bus timeout (HPFB BUS TIMEOUT)
Cause: There is no communication with the frequency converter. Only active if parameter 804 is not OFF.



Remedy:

  • Check bus communication cabling.

  • Parameter 803 Bus time interval could possibly be increased.
WARNING 19
Fault in the EEprom on the power card (EE ERROR POWER CARD)
Cause: There is a fault on the power card EEPROM. The frequency converter will likely fail at the next power-up.



Remedy:

  • Contact your Danfoss supplier.
WARNING 20
Fault in the EEprom on the control card (EE ERROR CTRL CARD)
Cause: There is a fault in the EEPROM on the control card. The frequency converter will likely fail at the next power-up.



Remedy:

  • Contact your Danfoss supplier.
ALARM 21
Auto-optimisation OK (AUTO MOTOR ADAPT OK)
Cause: The automatic motor tuning is OK and the frequency converter is now ready for operation.



Remedy:

  • No action required.
ALARM 22
Auto-optimisation not OK (AUTO MOT ADAPT FAIL)
Cause: A fault has been found during automatic motor adaptation (AMA). The figure in brackets [] indicates the specific fault code:


[0]: CHECK P.103,105

[1]: LOW P.105

[2]: ASYMMETRICAL IMPEDANCE

[3]: MOTOR TOO BIG

[4]: MOTOR TOO SMALL

[5]: TIME OUT

[6]: INTERRUPTED BY USER

[7]: INTERNAL FAULT

[8]: LIMIT VALUE FAULT

[9]: MOTOR ROTATES



Remedy:

  • Note: AMA can only be carried out if there are no alarms during tuning.

  • Refer to the “Automatic motor adaptation, AMA” section in the manual for specific code troubleshooting.
WARNING/ALARM 23
Fault during brake test (BRAKE TEST FAILED)
Cause: The brake test (run after power-up) found a fault. Possible reasons:


– No brake resistor connected.

– Fault in the connections.

– Defective brake resistor or defective brake transistor.



Remedy:

  • Check brake resistor connections.

  • Replace defective components.
WARNING 25
Brake resistor fault (BRAKE RESISTOR FAULT)
Cause: The brake resistor is monitored during operation and if it short-circuits, the brake function is disconnected.



Remedy:

  • Turn off the frequency converter.

  • Replace the brake resistor.
ALARM/WARNING 26
Brake resistor power 100% (BRAKE PWR WARN 100%)
Cause: The power transmitted to the brake resistor (calculated as a percentage mean over 120s) is higher than 100%.



Remedy:

  • Reduce braking cycle or load.

  • If Trip [2] is selected in parameter 403, the converter will cut out.
WARNING 27
Brake transistor fault (BRAKE IGBT FAULT)
Cause: The brake transistor is short-circuited. Substantial power will be transmitted to the brake resistor, even if inactive.



Remedy:

  • Turn off the frequency converter.

  • Remove the brake resistor.
ALARM: 29
Heat sink temperature too high
(HEAT SINK OVER TEMP.)
Cause: The cut-out temperature of the heat-sink has been exceeded (90°C for IP 00/20, 80°C for IP 54). The fault cannot be reset until the temperature is below 60°C.

The fault could be:

  • Ambient temperature too high.

  • Too long motor cable.

  • Too high switching frequency.
ALARM: 30
Motor phase U missing
(MISSING MOT.PHASE U)
Cause: Motor phase U between frequency converter and motor is missing.


Remedy:

  • Turn off the frequency converter.

  • Check motor phase U.
ALARM: 31
Motor phase V missing
(MISSING MOT.PHASE V)
Cause: Motor phase V between frequency converter and motor is missing.


Remedy:

  • Turn off the frequency converter.

  • Check motor phase V.
ALARM: 32
Motor phase W missing
(MISSING MOT.PHASE W)
Cause: Motor phase W between frequency converter and motor is missing.


Remedy:

  • Turn off the frequency converter.

  • Check motor phase W.
ALARM: 33
Quick discharge not OK
(QUICK DISCHARGE NOT OK)
Remedy:

  • Check whether a 24 Volt external DC supply has been connected.

  • Check that an external brake/discharge resistor has been fitted.
WARNING/ALARM: 34
Fieldbus communication fault
(FIELDBUS COMMUNICATION FAULT)
Cause: The fieldbus on the communication option card is not working.
WARNING: 35
Out of frequency range
(OUT OF FREQUENCY RANGE)
Cause: This warning is active if the output frequency has reached its Output frequency low limit (parameter 201) or Output frequency high limit (parameter 202).

Note: If in Process control, closed loop, bit 008000 will be active in extended status word, but there will be no warning in the display.
WARNING/ALARM: 36
Mains failure
(MAINS FAILURE)
Cause: Supply voltage to the frequency converter is lost and parameter 407 is set to a value other than OFF.


Remedy:

  • Check the fuses to the frequency converter.
ALARM: 37
Inverter fault (Inverter fault)
Cause: IGBT or the power card is defective.

Remedy: Contact your Danfoss supplier.


Auto-optimisation warnings:

AMA has stopped, likely due to wrong parameters or motor size mismatch.

Remedy:

  • Press [CHANGE DATA] and choose ‘Continue’ + [OK] or ‘Stop’ + [OK].

  • If parameters need changing, select ‘Stop’ and start AMA all over.
WARNING: 39
CHECK P.104, 106
Cause: The setting of parameter 102, 104 or 106 is probably wrong.


Remedy:

  • Check the setting.

  • Choose ‘Continue’ or ‘Stop’.
WARNING: 40
CHECK P.103, 105
Cause: The setting of parameter 102, 103 or 105 is probably wrong.


Remedy:

  • Check the setting.

  • Choose ‘Continue’ or ‘Stop’.
WARNING: 41
MOTOR TOO BIG
Cause: The motor used is probably too big for AMA to be carried out. The setting in parameter 102 may not match the motor.


Remedy:

  • Check the motor.

  • Choose ‘Continue’ or ‘Stop’.
WARNING: 42
MOTOR TOO SMALL
Cause: The motor used is probably too small for AMA to be carried out. The setting in parameter 102 may not match the motor.


Remedy:

  • Check the motor.

  • Choose ‘Continue’ or ‘Stop’.
ALARM: 43
Brake fault (BRAKE FAULT)
Cause: A fault has arisen on the brake. See specific sub-faults below:


[0] Brake check failed: Brake disconnected.
  • Check whether brake is connected correctly.



[1] Brake resistor short-circuited:
  • Replace the brake resistor.



[2] Brake IGBT short-circuited: Unit is unable to stop the brake; resistor is constantly energized.
WARNING/ALARM: 44
Encoder loss
(ENCODER FAULT)
Cause: The encoder signal is interrupted from terminal 32 or 33.


Remedy:

  • Check the connections.
WARNING/ALARM: 57
Overcurrent
(OVERCURRENT)
Cause: As warning/alarm 13, but in this case the warning/alarm occurs together with a quick stop.
ALARM: 60
Safety stop
(EXTERNAL FAULT)
Cause: Terminal 27 (parameter 304 Digital Inputs) has been programmed for a safety interlock [3] and is a logic ‘0’.