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VLT® HVAC Drive FC 131
Programming Guide
5.5.2 WARNING/ALARM 3, No Motor
Cause
No motor is connected to the output of the drive.
Troubleshooting
•
Check the cable connection between the drive and the motor.
5.5.3 WARNING/ALARM 4, Mains Phase Loss
Cause
A phase is missing on the supply side, or the mains voltage imbalance is too high. This message also appears for a fault in the input
rectifier. Options are programmed in parameter 14-12 Function at Mains Imbalance.
Troubleshooting
•
Check the supply voltage and supply currents to the drive.
5.5.4 WARNING/ALARM 7, DC Overvoltage
Cause
If the DC-link voltage exceeds the limit, the drive trips after a time.
Troubleshooting
•
Extend the ramp time.
•
Activate functions in parameter 2-10 Brake Function.
•
Activate overvoltage control in parameter 2-17 Over-voltage Control.
5.5.5 WARNING/ALARM 8, DC Under Voltage
Cause
If the DC-link voltage (DC) drops below the undervoltage limit, the drive trips after a fixed time delay. The time delay varies with unit
size.
Troubleshooting
•
Check that the supply voltage matches the drive voltage.
•
Perform the input voltage test.
5.5.6 WARNING/ALARM 9, Inverter Overload
Cause
The drive is about to cut out because of an overload (too high current for too long). The counter for electronic, thermal inverter
protection issues a warning at 90% and trips at 100%, while giving an alarm. The drive cannot be reset until the counter is below
90%.
The fault occurs when the drive has run with more than 100% overload for too long.
Troubleshooting
•
Compare the output current shown on the LCP with the drive rated current.
•
Compare the output current shown on the LCP with measured motor current.
•
Show the thermal drive load on the LCP and monitor the value. When running above the drive continuous current rating, the
counter increases. When running below the drive continuous current rating, the counter decreases.
5.5.7 WARNING/ALARM 10, Motor Overload Temperature
Cause
According to the electronic thermal protection (ETR), the motor is too hot. Select whether the drive issues a warning or an alarm
when the counter reaches 100% in parameter 1-90 Motor Thermal Protection. The fault occurs when the motor runs with more than
100% overload for too long.
182 | Danfoss A/S © 2022.05
Troubleshooting
AU370727746889en-000101 / 130R0994
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