Symptom
Possible cause
Test
Solution
Motor not running
Service switch open or missing
motor connection
Check if the motor is connected
and the connection is not
interrupted (by a service switch or
other device)
Connect the motor and check the
service switch
No line power with 24 V DC
option card
If the display is functioning but no
output, check that line power is
applied to the adjustable frequency
drive
Apply line power to run the unit
LCP Stop
Check if [Off] has been pressed
Press [Auto On] or [Hand On]
(depending on operation mode) to
run the motor
Missing start signal (Standby)
Check
5-10 Terminal 18 Digital Input
for correct setting for terminal 18
(use default setting)
Apply a valid start signal to start
the motor
Motor coast signal active
(Coasting)
Check
5-12 Coast inv
. for correct
setting for terminal 27 (use default
setting)
Apply 24 V on terminal 27 or
program this terminal to
no
operation
Wrong reference signal source
Check reference signal: Local,
remote or bus reference? Preset
reference active? Terminal
connection correct? Scaling of
terminals correct? Reference signal
available?
Program correct settings. Check
3-13 Reference Site
. Set preset
reference active in parameter
group
3-1* References
. Check for
correct wiring. Check scaling of
terminals. Check reference signal
Motor running in wrong
direction
Motor rotation limit
Check that
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
See
in
this manual
Motor is not reaching
maximum speed
Frequency limits set wrong
Check output limits in
4-13 Motor
Speed High Limit [RPM]
,
4-14 Motor
Speed High Limit [Hz]
and
4-19 Max
Output Frequency
Program correct limits
Reference input signal not scaled
correctly
Check reference input signal
scaling in
6-0* Analog I/O Mode
and
parameter group
3-1* References.
Reference limits in parameter
group
3-0* Reference Limits
Program correct settings
Motor speed 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
1-6* Load Depen. Setting
. For
closed-loop operation, check
settings in parameter group
20-0*
Feedback
Motor runs rough
Possible overmagnetization
Check for incorrect motor settings
in all motor parameters
Check motor settings in parameter
groups
1-2* Motor Data, 1-3* Addl.
Motor Data
, and
1-5* Load Indep.
Setting
Motor will not brake
Possible incorrect settings in the
brake parameters. Possible too
short ramp-down times.
Check brake parameters. Check
ramp time settings
Check parameter group
2-0* DC
Brake
and
3-0* Reference Limits
Basic Start-up Troubleshoot...
Instruction Manual
MG37A222
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
147
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Summary of Contents for VLT AutomationDrive FC 302
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