Danfoss VLT AutomationDrive FC 361 Operating Manual page 58

Maintenance, Diagnostics, a...
Symptom
Open power
fuses
Mains current
imbalance
greater than
3%
Motor current
imbalance
greater than
3%
9 9
AC drive
acceleration
problems
AC drive
deceleration
problems
Table 9.5 Troubleshooting
56
Possible cause
Phase-to-phase short.
Motor overload.
Loose connections.
Problem with mains power (see
alarm 4, Mains phase loss
description).
Problem with the AC drive.
Problem with motor or motor
wiring.
Problem with AC drive.
Motor data are entered
incorrectly.
Motor data are entered
incorrectly.
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VLT® AutomationDrive FC 361
Test
Motor or panel has a short phase-to-phase.
Check motor and panel phases for shorts.
Motor is overloaded for the application.
Perform pre-start-up check for loose
connections.
Rotate input power leads into the 1 position:
A to B, B to C, C to A.
Rotate input power leads into the AC drive 1
position: A to B, B to C, C to A.
Rotate output motor cables 1 position: U to V,
V to W, W to U.
Rotate output motor cables 1 position: U to V,
V to W, W to U.
If warnings or alarms occur, see
chapter 9.5 List of Warnings and Alarms.
Check that motor data are entered correctly.
If warnings or alarms occur, see
chapter 9.5 List of Warnings and Alarms.
Check that motor data are entered correctly.
Solution
Eliminate any shorts detected.
Perform start-up test and verify that
motor current is within specifications. If
motor current is exceeding the nameplate
full load current, the motor can run only
with reduced load. Review the specifi-
cations for the application.
Tighten loose connections.
If imbalanced leg follows the wire, it is a
power problem. Check the mains supply.
If the imbalanced leg stays on same input
terminal, it is a problem with the AC
drive. Contact 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 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
parameter 3-42 Ramp 1 Ramp Down Time.
Enable overvoltage control in
parameter 2-17 Over-voltage Control.
MG06I102