Danfoss VLT FC 102 User Manual page 51

Maintenance, Diagnostics, a...
Symptom Possible cause
Motor is Motor rotation limit is not
running in programmed correctly.
wrong
Active reversing signal is
direction
programmed.
Wrong motor phase
connection.
Motor is not Frequency limits are set
reaching incorrectly.
maximum
speed
Reference input signal is not
scaled correctly.
Motor speed Possible incorrect parameter
is unstable settings.
Motor runs Possible overmagnetization.
rough
Motor does Possibly incorrect settings in
not brake the brake parameters. Possibly
ramp-down times are too short.
Open power Phase-to-phase short.
fuses or
tripped circuit
Motor overload.
breaker
Loose connections.
Mains current Problem with mains power (See
imbalance is alarm 4, Mains phase loss
greater than description).
3%
Problem with the drive system.
Motor current Problem with the motor or
imbalance is motor wiring.
greater than
3%
Problem with the drive system.
MG37L202
User Guide
Test
Check that parameter 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 parameter 4-13 Motor Speed
High Limit [RPM], parameter 4-14 Motor Speed High
Limit [Hz], and parameter 4-19 Max Output Frequency.
Check reference input signal scaling in parameter
group 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 circuit, phase-to-phase.
Check motor and panel phase for short circuits.
Motor is overloaded for the application.
Perform a pre-startup check for loose connections.
Rotate the input power leads into the drive system 1
position: A to B, B to C, and C to A.
Rotate the input power leads into the drive system 1
position: A to B, B to C, and C to A.
Rotate the output motor cables 1 position: U to V, V
to W, and W to U.
Rotate the output motor cables 1 position: U to V, V
to W, and W to U.
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Solution
Program the correct settings.
Deactivate the reversing signal.
Change the direction of rotation
by switching 2 phases in the
motor cable, or by changing the
setting of parameter 4-10 Motor
Speed Direction.
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 detected short
circuits.
Perform the startup test and
verify that motor current is within
specifications. If motor current
exceeds the nameplate full load
current, the motor runs only with
reduced load. Review the specifi-
cations for the application.
Tighten any loose connections.
If the imbalanced leg stays on
the same power lead, it is a
power problem. Check the mains
supply.
If the imbalanced leg stays on
the same input terminal, the
problem is in the unit. Contact a
Danfoss supplier.
If the imbalanced leg stays on
the same output motor cable, the
problem is in the motor or motor
wiring. Check the motor and
motor wiring.
If the imbalanced leg stays on
the same output terminal, the
problem is with the unit. Contact
a Danfoss supplier.
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