Danfoss VLT FC 103 Operating page 140

VLT® Refrigeration Drive FC 103
Operating Guide
Symptom Possible cause
Problem with the AC drive.
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
140 | Danfoss A/S © 2020.09
Test
Rotate input power leads into the
AC drive 1 position: A to B, B to C, C
to A.
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 section.
Check that motor data are entered
correctly.
If warnings or alarms occur, refer to
the Warnings and Alarms section.
Check that motor data are entered
correctly.
Maintenance, Diagnostics, and
Troubleshooting
Solution
If the imbalanced leg stays on same in-
put terminal, it is a problem with the
AC drive. Contact the supplier.
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 parame-
ter 3-41 Ramp 1 Ramp Up Time. Increase
current limit in parameter 4-18 Current
Limit. Increase torque limit in parame-
ter 4-16 Torque Limit Motor Mode.
Increase the ramp-down time in pa-
rameter 3-42 Ramp 1 Ramp Down Time.
Enable overvoltage control in parame-
ter 2-17 Over-voltage Control.
AQ357954340588en-000201 / 130R0881