Danfoss VLT FC 103 Operating Instructions Manual page 95

Basic Troubleshooting
Symptom
Motor rotation limit
Active reversing signal
Motor running in wrong
direction
Wrong motor phase connection
Frequency limits set wrong
Motor is not reaching Reference input signal not scaled
maximum speed
correctly
Possible incorrect parameter
settings
Motor speed unstable
Possible overmagnetisation
Motor runs rough
Possible incorrect settings in the
Motor does not brake brake parameters. Possible too
short ramp down times
Phase-to-phase short
Motor overload
Open power fuses or circuit
breaker trip
Loose connections
Problem with mains power (See
Alarm 4 Mains phase loss
description)
Mains current imbalance
greater than 3% Problem with the frequency
converter
Problem with motor or motor
wiring
Motor current imbalance
greater than 3%
Problem with the frequency
converters
MG16J202
Operating Instructions
Possible cause
Check that 4-10 Motor Speed
Direction is programmed correctly.
Check if a reversing command is
programmed for the terminal in
parameter group 5-1* Digital inputs.
Check output limits in 4-13 Motor
Speed High Limit [RPM], 4-14 Motor
Speed High Limit [Hz] and 4-19 Max
Output Frequency.
Check reference input signal
scaling in parameter groups 6-0*
Analog I/O Mode and 3-1*
References. 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 PID settings.
Check for incorrect motor settings
in all motor parameters.
Check brake parameters. Check
ramp time settings.
Motor or panel has a short phase
to phase. Check motor and panel
phase for shorts.
Motor is overloaded for the
application.
Perform pre-start-up check for
loose connections.
Rotate input power leads into the
frequency converter one position: A
to B, B to C, C to A.
Rotate input power leads into the
frequency converter one position: A
to B, B to C, C to A.
Rotate output motor leads one
position: U to V, V to W, W to U.
Rotate output motor leads one
position: U to V, V to W, W to U.
Danfoss A/S © Rev. 05/2014 All rights reserved.
Test
Program correct settings.
Deactivate reversing signal.
See chapter 3.4.6 Motor Rotation
Check in this manual.
Program correct limits.
Program correct settings.
Check settings in parameter group
1-6* Load Depen. Setting. For closed
loop operation, check settings in
parameter group 20-0* Feedback.
Check 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 shorts detected.
Perform startup test and verify
motor current is within specifi-
cations. If motor current is
exceeding nameplate full load
current, motor may 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 mains
power supply.
If imbalance leg stays on 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 motor and
motor wiring.
If imbalance leg stays on same
output terminal, it is a problem
with the unit. Contact the supplier.
Solution
10
93
10