Danfoss VLT AQUA FC 202 Operating Instructions Manual page 45

Maintenance, Diagnostics an...
Symptom Possible cause
Problem with the mains power
(See Alarm 4 Mains phase loss
Mains current
description)
imbalance
Problem with the frequency
>3%
converter
Problem with the motor or
motor wiring
Motor current
imbalance
Problem with the frequency
>3% converter
Frequency Motor data was entered
converter incorrectly
acceleration
problems
Frequency Motor data was entered
converter incorrectly
deceleration
problems
Resonances
Acoustic noise
or vibration
Table 7.5 Troubleshooting
MG20MB02
Operating Instructions
Test
Rotate input power leads into the
frequency converter 1 position: A to B, B to
C, C to A.
Rotate input power leads into the
frequency converter 1 position: A to B, B to
C, C to A.
Rotate output motor leads 1 position: U to
V, V to W, W to U.
Rotate output motor leads 1 position: U to
V, V to W, W to U.
If warnings or alarms occur, see
chapter 7.4 List of Warnings and Alarms.
Check that motor data is entered correctly.
If warnings or alarms occur, see
chapter 7.4 List of Warnings and Alarms.
Check that motor data is entered correctly.
Bypass critical frequencies by using
parameters in parameter group 4-6* Speed
Bypass.
Turn off over-modulation in 14-03 Overmo-
dulation.
Change the switching pattern and
frequency in parameter group 14-0* Inverter
Switching.
Increase Resonance Dampening in
1-64 Resonance Dampening.
Danfoss A/S © Rev. 05/2014 All rights reserved.
Solution
If imbalanced leg follows the wire, it is a
power problem. Check the mains power
supply.
If imbalance leg stays on the same input
terminal, it is a problem with the unit.
Contact the supplier.
If imbalanced leg follows the wire, the
problem is in the motor or motor wiring.
Check the motor and motor wiring.
If imbalance leg stays on same output
terminal, it is a problem with the
frequency converter. Contact the Danfoss
supplier.
Increase the ramp-up time in 3-41 Ramp 1
Ramp Up Time. Increase the current limit in
4-18 Current Limit. Increase the torque limit
in 4-16 Torque Limit Motor Mode.
Increase the ramp-down time in 3-42 Ramp
1 Ramp Down Time. Enable overvoltage
control in 2-17 Over-voltage Control.
Check if noise and/or vibration have been
reduced to an acceptable limit.
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