Danfoss VLT FC 103 Operating Manual page 106

Operating Guide | VLT® Refrigeration Drive FC 103
Troubleshooting
• Remove power and check if the motor shaft can be turned.
• Check that the motor size matches the drive.
• Check that the motor data is correct in parameters 1-20 to 1-25.
8.4.14 ALARM 14, Earth (Ground) Fault
Cause
There is current from the output phase to ground, either in the cable between the drive and the motor, or in the motor itself. The
current transducers detect the ground fault by measuring current going out from the drive and current going into the drive from the
motor. Ground fault is issued if the deviation of the 2 currents is too large. The current going out of the drive must be the same as the
current going into the drive.
Troubleshooting
• Remove power to the drive and repair the ground fault.
• Check for ground faults in the motor by measuring the resistance to ground of the motor cables and the motor with a
megohmmeter.
• Reset any potential individual offset in the 3 current transducers in the drive. Perform a manual initialization or perform a complete
AMA. This method is most relevant after changing the power card.
8.4.15 ALARM 15, Hardware Mismatch
Cause
A fitted option is not operational with the present control card hardware or software.
Troubleshooting
Record the value of the following parameters and contact Danfoss.
• Parameter 15-40 FC Type.
• Parameter 15-41 Power Section.
• Parameter 15-42 Voltage.
• Parameter 15-43 Software Version.
• Parameter 15-45 Actual Typecode String.
• Parameter 15-49 SW ID Control Card.
• Parameter 15-50 SW ID Power Card.
• Parameter 15-60 Option Mounted.
• Parameter 15-61 Option SW Version (for each option slot).
8.4.16 ALARM 16, Short Circuit
Cause
There is short-circuiting in the motor or motor wiring.
104 | Danfoss A/S © 2020.01
Maintenance, Diagnostics, and
Troubleshooting
AQ275652766279en-000101 / 130R0707