8.5 Troubleshooting
Symptom
Possible cause
Test
Solution
Motor not running
LCP stop
Check if [Off] has been pressed.
Press [Auto On] or [Hand On]
(depending on operating mode) to
run the motor.
Missing start signal (standby)
Check
parameter 5-10 Terminal 18
Digital Input
of correct setting for
terminal 18 (use default setting).
Apply a valid start signal to start the
motor.
Motor coast signal active (coasting)
Check
parameter 5-12 Terminal 27
Digital Input
for correct setting of
terminal 27 (use default setting).
Apply 24 V on terminal 27 or
program this terminal to
[0] No
operation
.
Wrong reference signal source
Check the following:
•
The reference signal is local,
remote, or bus reference?
•
Preset reference is active?
•
Terminal connection is correct?
•
The scaling of terminals is correct?
•
The reference signal is available?
Program correct settings. Set preset
reference active in
parameter group
3-1* References
. Check for correct
wiring. Check scaling of terminals.
Check reference signal.
Motor is running in
the wrong direction
Motor rotation limit
Check that
parameter 4-10 Motor
Speed Direction
is programmed
correctly.
Program correct settings.
Active reversing signal
Check if a reversing command is
programmed for the terminal in
parameter group 5-1* Digital inputs
.
Deactivate reversing signal.
Wrong motor phase connection
Change
parameter 1-06 Clockwise
Direction
.
Motor is not
reaching maximum
speed
Frequency limits are set incorrectly
Check output limits in
parameter 4-14 Motor Speed High Limit
[Hz]
and
parameter 4-19 Max Output
Frequency
.
Program correct limits.
Reference input signal not scaled
correctly
Check reference input signal scaling in
parameter group 6-** Analog I/O mode
and
parameter group 3-1* References
.
Program correct settings.
Motor speed is
unstable
Possible incorrect parameter settings
Check the settings of all motor
parameters, including all motor
compensation settings. For closed-
loop operation, check PID settings.
Check settings in
parameter group 6-
** Analog I/O mode
.
Motor runs roughly Possible overmagnetization
Check for incorrect motor settings in
all motor parameters.
Check motor settings in
parameter
groups
1-2* Motor data, 1-3* Adv
motor data
, and
1-5* Load indep.
setting.
Motor does not
brake
Possible incorrect settings in the
brake parameters. Possible too short
ramp-down times.
Check brake parameters. Check ramp
time settings.
Check
parameter groups 2-0* DC brake
and
3-0* Reference limits
.
Maintenance, Diagnostics, a...
Operating Guide
MG07A402
Danfoss A/S © 10/2017 All rights reserved.
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