Danfoss VLT FC 102 User Manual page 52

Maintenance, Diagnostics, a...
Symptom
Drive system
has
acceleration
problems
Drive system
has
deceleration
problems
Acoustic noise
or vibration
6 6
(for example,
a fan blade is
making noise
or vibrations
at certain
frequencies)
Table 6.8 Troubleshooting
50
Possible cause
Motor data are entered
incorrectly.
Motor data are entered
incorrectly.
Excessive resonances, for
example, in the motor/fan
system.
Danfoss A/S © 08/2017 All rights reserved.
®
VLT Parallel Drive Modules
Test
If warnings or alarms occur, see chapter 6.5 List of
Warnings and Alarms.
Check that motor data are entered correctly.
If warnings or alarms occur, see chapter 6.5 List of
Warnings and Alarms.
Check that motor data are entered correctly.
Bypass critical frequencies, using parameters in the
parameter group 4-6* Speed Bypass.
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.
Solution
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.
Check if noise and vibration have
been reduced to an acceptable
level.
MG37L202