Danfoss VLT Aqua Drive FC 202 Operating Manual page 49

Maintenance, Diagnostics, a...
Symptom Possible cause
Frequency limits are set
incorrectly.
Motor is not
reaching
maximum
Reference input signal is not
speed
scaled correctly.
Possible incorrect parameter
Motor speed settings.
unstable
Possible overmagnetization.
Motor runs
rough
Possible incorrect settings in
Motor does
the brake parameters. Possible
not brake
too short ramp-down times.
Phase-to-phase short circuit.
Motor overload.
Open power
fuses or circuit
breaker trip
Loose connections.
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.
Motor data was entered
Frequency incorrectly.
converter
acceleration
problems
Frequency Motor data was entered
converter incorrectly.
deceleration
problems
MG20MD02
Operating Guide
Test
Check the output limits in
parameter 4-13 Motor Speed High Limit
[RPM], parameter 4-14 Motor Speed High
Limit [Hz] and parameter 4-19 Max Output
Frequency.
Check the reference input signal scaling in
parameter group 6-0* Analog I/O Mode and
parameter group 3-1* References. Check the
reference limits in parameter group 3-0*
Reference Limit.
Check the settings of all motor parameters,
including all motor compensation settings.
For closed-loop operation, check the PID
settings.
Check for incorrect motor settings in all
motor parameters.
Check the brake parameters. Check the
ramp time settings.
The motor or panel has a short phase-to-
phase. Check the motor and panel phase
for short circuits.
Motor is overloaded for the application.
Perform a pre-startup check for loose
connections.
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 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 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.
Danfoss A/S © 10/2016 All rights reserved.
Solution
Program the correct limits.
Program the correct settings.
Check the settings in parameter group 1-6*
Load Depen. Setting. For closed-loop
operation, check the settings in parameter
group 20-0* Feedback.
Check the motor settings in parameter
groups 1-2* Motor Data, 1-3* Adv Motor
Data, and 1-5* Load Indep. Setting.
Check parameter groups 2-0* DC Brake and
3-0* Reference Limits.
Eliminate any short circuits detected.
Perform a start-up test and verify that the
motor current is within the specifications. If
the motor current exceeds the nameplate
full load current, the motor may run only
with reduced load. Review the specifi-
cations for the application.
Tighten any loose connections.
If imbalanced leg follows the wire, it is a
power problem. Check the mains 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
parameter 3-41 Ramp 1 Ramp Up Time.
Increase the current limit in
parameter 4-18 Current Limit. Increase the
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.
7 7
47