Specifications - Danfoss VLT AQUA Drive FC 200 Operating Instructions Manual

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
maximum speed
Reference input signal not scaled
correctly
Possible incorrect parameter
settings
Motor speed unstable
Possible over-magnetization
Motor runs rough
Possible incorrect settings in the
Motor will 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
Mains current imbalance description)
greater than 3%
Problem with the frequency
converter unit
Problem with motor or motor
wiring
Motor current imbalance
greater than 3%
Problem with drive unit
Table 9.1
®
VLT AQUA Drive
Operating Instructions
Possible Cause
Check that 4-10 Motor sped
direction is programmed correctly.
Check if a reversing command is
programmed for the terminal in
parameter group5-1* 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 6-* Analog I/O mode and
parameter group3-1* References.
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 to for shorts.
Motor is overloaded for the
application.
Perform pre-startup check for loose
connections.
Rotate input power leads into the
drive 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.
®
MG.20.M8.02 - VLT is a registered Danfoss trademark
Test
Program correct settings.
Deactivate reversing signal.
See 3.5 Check Motor Rotation in this
manual.
Program correct limits.
Program correct settings.
Check settings in parameter
group1-6* Analog I/O mode. 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 group2-0* 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 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 supplier.
Solution
9
65
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