Troubleshooting - Danfoss VLT Midi Drive FC 280 Operating Instructions Manual

Maintenance, Diagnostics, a...

8.5 Troubleshooting

Symptom
LCP stop
Missing start signal (standby)
Motor coast signal active (coasting)
Motor not running
Wrong reference signal source
Motor rotation limit
Motor is running in
the wrong direction Active reversing signal
Wrong motor phase connection
Frequency limits are set incorrectly
Motor is not
reaching maximum
speed
Reference input signal not scaled
correctly
Motor speed is
Possible incorrect parameter settings
unstable
Motor runs roughly Possible overmagnetization
Possible incorrect settings in the
Motor does not
brake parameters. Possible too short
brake
ramp-down times.
MG07A102
Operating Instructions
Possible cause
Check if [Off] has been pressed.
Check parameter 5-10 Terminal 18
Digital Input for correct setting for
terminal 18 (use default setting).
Check parameter 5-12 Terminal 27
Digital Input for correct setting for
terminal 27 (use default setting).
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?
Check that parameter 4-10 Motor
Speed Direction is programmed
correctly.
Check if a reversing command is
programmed for the terminal in
parameter group 5-1* Digital inputs..
Change parameter 1-06 Clockwise
Direction.
Check output limits in
parameter 4-14 Motor Speed High Limit
[Hz] and parameter 4-19 Max Output
Frequency.
Check reference input signal scaling in
6-** Analog I/O mode and parameter
group 3-1* 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.
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Test
Press [Auto On] or [Hand On]
(depending on operating mode) to
run the motor.
Apply a valid start signal to start the
motor.
Apply 24 V on terminal 27 or
program this terminal to [0] No
operation..
Program correct settings. Set preset
reference active in parameter group
3-1* References. Check for correct
wiring. Check scaling of terminals.
Check reference signal.
Program correct settings.
Deactivate reversing signal.
Program correct limits.
Program correct settings.
Check settings in parameter group 6-
** Analog I/O mode.
Check motor settings in parameter
groups 1-2* Motor data, 1-3* Adv
motor data, and 1-5* Load indep.
setting.
Check parameter group 2-0* DC brake
and 3-0* Reference limits.
Solution
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