Danfoss VLT HVAC Drive FC 102 Operating Manual page 139

VLT® HVAC Drive FC 102
Operating Guide
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.
9.4.16 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).
9.4.17 ALARM 16, Short Circuit
Cause
There is short-circuiting in the motor or motor wiring.
Troubleshooting
• Disconnect power before proceeding.
• Remove the power to the drive and repair the short circuit.
9.4.18 WARNING/ALARM 17, Control Word Timeout
Cause
There is no communication to the drive. The warning is only active when parameter 8-04 Control Word Timeout Function is NOT set to
[0] Off.
If parameter 8-04 Control Word Timeout Function is set to [5] Stop and trip, a warning appears, and the drive ramps down to a stop
and shows an alarm.
Troubleshooting
• Check the connections on the serial communication cable.
• Increase parameter 8-03 Control Word Timeout Time.
• Check the operation of the communication equipment.
• Verify that proper EMC installation was performed.
9.4.19 WARNING/ALARM 20, Temp. Input Error
Cause
The temperature sensor is not connected.
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Maintenance, Diagnostics, and
Troubleshooting
AQ262141314214en-000301 / 130R0880 | 139