Danfoss VLT FC 102 Operating Manual page 70

VLT HVAC Drive FC 102
Operating Guide
Troubleshooting
• If the motor torque limit is exceeded during ramp-up, extend the ramp-up time.
• If the generator torque limit is exceeded during ramp-down time, extend the ramp-down time.
• If torque limit occurs while running, increase the torque limit. Make sure that the system can operate safely at a higher torque.
• Check the application for excessive current draw on the motor.
7.6.12 WARNING/ALARM 13, Overcurrent
Cause
The inverter peak current limit (approximately 200% of the rated current) is exceeded. The warning lasts approximately 1.5 s, then
the drive trips and issues an alarm. Shock loading or quick acceleration with high-inertia loads can cause this fault. If the accelera-
tion during ramp-up is quick, the fault can also appear after kinetic backup. If extended mechanical brake control is selected, a trip
can be reset externally.
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.
7.6.13 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 sensors 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 megohm-
meter.
• Reset any potential individual offset in the 3 current sensors in the drive. Perform a manual initialization or perform a complete
AMA. This method is most relevant after changing the power card.
7.6.14 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).
7.6.15 ALARM 16, Short Circuit
Cause
There is short-circuiting in the motor or motor wiring.
70 | Danfoss A/S © 2023.09
Diagnostics and Troubleshooting
AQ267037536117en-000101 / 130R0083