Faults; Troubleshooting - Danfoss VLT ISD 410 Operating Instructions Manual

Faults

9 Faults
If faults occur during servo system operation, they are
indicated on the front panel of the connection box. See
the connection box operating instructions for information
on error message codes.
First use Table 9.1 to check the possible causes of the fault.
NOTE
If the fault cannot be eliminated by one of the measures
listed, notify Danfoss Service.
Have the following information available to enable Danfoss
to provide help quickly and effectively:
•
Type number
•
Error message number
•
Firmware version
9 9

9.1 Troubleshooting

When problems occur in the servo system, they must first
be located and properly identified. Table 9.1 lists potential
faults in the servomotor, their possible causes, and actions
for correcting the faults.
Fault
Motor overheats (high
surface temperature)
Motor not running
Motor does not run or
only starts up slowly or
with difficulty
Motor hums and draws
high current
Motor stops suddenly
and does not restart
Wrong motor rotation
direction
Motor runs normally,
but does not generate
the expected torque
Motor runs in an
uncontrolled manner in
one direction at
maximum speed
32
®
VLT ISD 410 Servomotor Operating Instructions
Possible Cause Possible Solution
Excessive load Check torques
No drive Check CAN
connection
Bearing wear Check bearings and
shaft
Motor defective Contact Danfoss
No drive Check CAN
connection
•
Parameter error Check software
•
Change rotation
direction if
appropriate
Motor defective Contact Danfoss
or parameter error
Incorrect setpoints Check software
MG75D102 - VLT
Fault
Motor runs slowly in
one direction, but
cannot be controlled by
the master
Motor screaming
Uneven running
Vibration
(Unusual) running
noises
Fuses blow, circuit
breaker trips or motor
protection trips
immediately
Motor speed drops
sharply under load
Brake does not release
Holding brake does not
hold the servomotor
Brake engagement
delayed
Noises when power-off
brake engaged
Table 9.1 Troubleshooting Overview
®
is a registered Danfoss trademark
Possible Cause Possible Solution
Software error Check software
Incorrect Contact Danfoss
calibration or
faulty current
measurement
Defective bearing Check shaft
Defective bearing Check shaft
Defective bearing Check shaft
Short circuit Contact Danfoss
At current limit Check application
Brake control Contact Danfoss
defective
Mechanical brake Contact Danfoss
defective
Software error Contact Danfoss
Mechanical brake Contact Danfoss
damaged