Danfoss VLT FC 103 Operating Manual page 128

Operating Guide | VLT® Refrigeration Drive FC 103
Symptom Possible cause
Motor current Problem with motor or motor
imbalance wiring.
greater than 3%
Problem with AC drive.
AC drive accel- Motor data are entered incor-
eration prob- rectly.
lems
AC drive decel- Motor data are entered incor-
eration prob- rectly.
lems
126 | Danfoss A/S © 2020.01
Test
Rotate output motor cables 1 posi-
tion: U to V, V to W, W to U.
Rotate output motor cables 1 posi-
tion: U to V, V to W, W to U.
If warnings or alarms occur, refer
to the Warnings and Alarms sec-
tion. Check that motor data are en-
tered correctly.
If warnings or alarms occur, refer
to the Warnings and Alarms sec-
tion. Check that motor data are en-
tered correctly.
Maintenance, Diagnostics, and
Troubleshooting
Solution
If the imbalanced leg follows the wire,
the problem is in the motor or motor
wiring. Check motor and motor wiring.
If the imbalanced leg stays on same
output terminal, it is a problem with
the unit. Contact the supplier.
Increase the ramp-up time in parameter
3-41 Ramp 1 Ramp Up Time. Increase
current limit in parameter 4-18 Current
Limit. Increase torque limit in parameter
4-16 Torque Limit Motor Mode.
Increase the ramp-down time in param-
eter 3-42 Ramp 1 Ramp Down Time. Ena-
ble overvoltage control in parameter
2-17 Over-voltage Control.
AQ275652766279en-000101 / 130R0707