Hi everyone,

Troubleshooting:

    Motor runs unevenly:
- Check if the VFD settings are correct. Adjust motor data settings if needed.
- If adjusting settings doesn't help, contact Danfoss for support.

    Motor does not run:
- Check the display for a backlight. If there's a backlight, look for any fault messages and refer to the Warnings section.
- If there's no backlight, ensure the VFD is connected to the power supply. If it is, proceed to the next step.

    Motor does not brake:
- Refer to the manual for instructions on controlling the brake function.

    No message or backlight in display:
- Check if the pre-fuses for the VFD have blown. If they have, contact Danfoss.
- If the fuses are okay, check for an overloaded control card. Disconnect control signal plugs and see if the fault disappears.

    Motor stopped, light in display, but no fault report:
- Try starting the VFD by pressing the [START] button.
- If the display is frozen, check cable connections. Ensure the motor is connected and all phases are okay.
- Set the VFD for local operation and adjust the reference value. Check if the motor runs. If not, contact Danfoss.

Display - Status Messages:

+ Start clockwise/anti-clockwise: Conflict between input on digital inputs and parameter data.

+ Slow-down: Output frequency is reduced by a set percentage.

+ Catch-up: Output frequency is increased by a set percentage.

+ Feedback high/low: Feedback value is higher/lower than the set value.

+ Output frequency high/low: Output frequency is higher/lower than the set value.

+ Output current high/low: Output current is higher/lower than the set value.

+ Braking max.: Brake is functioning, and braking power limit is exceeded.

+ Ramp operation: Output frequency is changing according to the set ramps.

+ Running, local/remote control: The VFD is running in local or remote control mode.

+ VLT ready, local/remote control: The VFD is ready in local or remote control mode.

+ Quick-stop, local/remote control: The VFD has stopped via a quick-stop signal.

+ DC stop, local/remote control: The VFD has stopped via a DC stop signal.

+ Stop, local/remote control: The VFD has stopped via the control panel or a digital input.

+ LCP stop, local/remote control: The VFD has stopped via the control panel, and the coast signal is high.

+ Stand by: The VFD will start when it receives a start signal.

+ Freeze output: The reference is frozen, and the VFD will not change output.

+ Jog operation, local/remote control: The VFD is in jog operation mode.

+ Overvoltage control: The VFD is trying to avoid a trip by increasing the output frequency.

+ Automatic Motor Adaptation: Automatic motor adaptation is running.

+ Brake check finished: Brake check of brake resistor and transistor tested successfully.

+ Quick Discharge finished: Quick discharge has been completed successfully.

+ Exceptions XXXX: The control card's microprocessor has stopped. Check for EMC-correct connection of cables.

+ Ramp stop in fieldbus mode: The drive is stopped by ramp down, command given over a fieldbus.

+ Coast stop in fieldbus mode: The drive is stopped by coast, command given over a fieldbus.

+ Quick stop in fieldbus mode: The drive is stopped by quick stop, command given over a fieldbus.

+ Start not possible: The drive is in fieldbus profile mode, and OFF1 must be toggled to start.

+ Not ready for operation: The drive is not ready for operation, possibly due to a trip or no mains supply.

+ Ready for operation: The drive is ready for operation.

+ Bus jog, remote controlled: Bus Jog has been selected by the fieldbus or serial bus.


Warnings and Alarms:

The VLT 5000 series provides warnings and alarms to indicate various issues. Some faults may lock the VFD, requiring a reset after addressing the issue. Warnings may precede alarms, or you can program certain faults to result in either a warning or an alarm. After a trip, both alarm and warning will flash, but only the alarm will continue flashing if the fault is removed.

+ 10 Volts low (10 VOLT LOW): The 10V reference voltage is low. (Warning)

+ Live zero fault (LIVE ZERO ERROR): Issue with the live zero signal. (Warning, Alarm)

+ No motor (NO MOTOR): No motor detected. (Warning)

+ Phase fault (MAINS PHASE LOSS): Issue with the mains phase. (Warning, Alarm, Trip locked)

+ Voltage warning high (DC LINK VOLTAGE HIGH): DC link voltage is too high. (Warning)

+ Voltage warning low (DC LINK VOLTAGE LOW): DC link voltage is too low. (Warning)

+ Overvoltage (DC LINK OVERVOLT): DC link overvoltage condition. (Warning, Alarm)

+ Undervoltage (DC LINK UNDERVOLT): DC link undervoltage condition. (Warning, Alarm)

+ Inverter overloaded (INVERTER TIME): Inverter is overloaded. (Warning, Alarm)

+ Motor overloaded (MOTOR TIME): Motor is overloaded. (Warning, Alarm)

+ Motor thermistor (MOTOR THERMISTOR): Issue with the motor thermistor. (Warning, Alarm)

+ Torque limit (TORQUE LIMIT): Torque limit exceeded. (Warning, Alarm)

+ Overcurrent (OVERCURRENT): Overcurrent condition. (Warning, Alarm, Trip locked)

+ Earth fault (EARTH FAULT): Earth fault detected. (Warning, Alarm)

+ Switch mode fault (SWITCH MODE FAULT): Issue with switch mode. (Warning, Alarm)

+ Short-circuit (CURR.SHORT CIRCUIT): Short-circuit condition. (Warning, Alarm)

+ Standard bus timeout (STD BUS TIMEOUT): Timeout on standard bus communication. (Warning, Alarm)

+ HPFB bus timeout (HPFB TIMEOUT): Timeout on HPFB bus communication. (Warning, Alarm)

+ Fault in EEprom on power card (EE ERROR POWER CARD): Issue with EEprom on power card. (Warning)

+ Fault in EEprom on control card (EE ERROR CTRL. CARD): Issue with EEprom on control card. (Warning)

+ Auto-optimisation OK (AUTO MOTOR ADAPT OK): Auto-optimisation successful. (Warning)

+ Auto-optimisation not OK (AUTO MOT ADAPT FAIL): Auto-optimisation failed. (Warning)

+ Brake test failed (BRAKE TEST FAILED): Brake test unsuccessful. (Warning, Alarm)

+ Brake resistor short-circuited (BRAKE RESISTOR FAULT): Brake resistor short-circuited. (Warning)

+ Brake resistor power 100% (BRAKE POWER 100%): Brake resistor power at 100%. (Warning, Alarm)

+ Brake transistor short-circuited (BRAKE IGBT FAULT): Brake transistor short-circuited. (Warning)

+ Heat-sink temperature too high (HEAT SINK OVER TEMP.): Heat-sink temperature is too high. (Warning, Alarm)

+ Motor phase U missing (MISSING MOT.PHASE U): Motor phase U is missing. (Warning)

+ Motor phase V missing (MISSING MOT.PHASE V): Motor phase V is missing. (Warning)

+ Motor phase W missing (MISSING MOT.PHASE W): Motor phase W is missing. (Warning)

+ Quick discharge not OK (QUICK DISCHARGE FAIL): Quick discharge failed. (Warning, Alarm)

+ Profibus communication fault (PROFIBUS COMM. FAULT): Issue with Profibus communication. (Warning, Alarm)

+ Out of frequency range (OUT FREQ RNG/ROT LIM): Frequency out of range. (Warning)

+ Mains failure (MAINS FAILURE): Mains power failure. (Warning, Alarm)

+ Inverter fault (INVERTER FAULT): Issue with the inverter. (Warning, Alarm)

+ Check parameters 104 and 106 (CHECK P.104 & P.106): Check parameters 104 and 106. (Warning)

+ Check parameters 103 and 105 (CHECK P.103 & P.105): Check parameters 103 and 105. (Warning)
+ Motor too big (Motor too big): Motor size is too large. (Warning)

+ Motor too small (Motor too small): Motor size is too small. (Warning)

+ Brake fault (BRAKE FAULT): Issue with the brake. (Warning, Alarm)

+ Encoder loss (ENCODER FAULT): Encoder signal lost. (Warning)

- Danfoss VFD Contact

+ Danfoss VLT 5000 user manual 

+ Danfoss VLT 5000 Fault index >>

+ VLT5000 Fault Codes 1 >>

+ VLT5000 Fault Codes 2 >>

+ VLT5000 Fault Codes 3 >>

+ VLT5000 Fault Codes 4 >>

+ Danfoss Main Page (2) >>

+ VFD Home page >>  

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