Symptom
Possible cause
Test
Solution
Drive system
has
acceleration
problems
Motor data are entered
incorrectly.
If warnings or alarms occur, see
.
Check that motor data are entered correctly.
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
.
Drive system
has
deceleration
problems
Motor data are entered
incorrectly.
If warnings or alarms occur, see
.
Check that motor data are entered correctly.
Increase the ramp-down time in
parameter 3-42 Ramp 1 Ramp
Down Time
. Enable overvoltage
control in
parameter 2-17 Over-
voltage Control
.
Acoustic noise
or vibration
(for example,
a fan blade is
making noise
or vibrations
at certain
frequencies)
Excessive resonances, for
example, in the motor/fan
system.
Bypass critical frequencies, using parameters in the
parameter group
4-6* Speed Bypass
.
Check if noise and vibration have
been reduced to an acceptable
level.
Turn off overmodulation in
parameter 14-03 Overmo-
dulation
.
Change the switching pattern and frequency in the
parameter group
14-0* Inverter Switching
.
Increase resonance damping in
parameter 1-64 Resonance Dampening
.
Table 6.8 Troubleshooting
Maintenance, Diagnostics, a...
VLT
®
Parallel Drive Modules
50
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MG37L202
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