Danfoss VLT AutomationDrive FC 301 Operating Instructions Manual page 50

Maintenance, Diagnostics an...
Symptom
Motor not
running
7 7
Motor
running in
wrong
direction
Motor is not
reaching
maximum
speed
Motor speed
unstable
Motor runs
rough
Motor does
not brake
Open power
fuses or
circuit
breaker trip
48
Possible Cause
Service switch open or missing
motor connection.
No mains power with 24 V DC
option card.
LCP Stop.
Missing start signal (Standby).
Motor coast signal active
(Coasting).
Wrong reference signal source.
Motor rotation limit.
Active reversing signal.
Wrong motor phase
connection.
Frequency limits set wrong.
Reference input signal not
scaled correctly.
Possible incorrect parameter
settings.
Possible overmagnetisation.
Possible incorrect settings in
the brake parameters. Possible
too short ramp down times.
Phase-to-phase short.
Motor overload.
Loose connections.
Danfoss A/S © Rev. 07/2014 All rights reserved.
Operating Instructions
Test
Check if the motor is connected and the
connection is not interrupted (by a service
switch or other devise).
If the display is functioning, but there is no
output, check that mains power is applied to
the frequency converter.
Check if [Off] has been pressed.
Check 5-10 Terminal 18 Digital Input for
correct setting for terminal 18 (use default
setting).
Check 5-12 Terminal 27 Digital Input for
correct setting for terminal 27 (use default
setting).
Check reference signal: Local, remote or bus
reference? Preset reference active? Terminal
connection correct? Scaling of terminals
correct? Reference signal available?
Check that 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.
Check output limits in 4-13 Motor Speed High
Limit [RPM], 4-14 Motor Speed High Limit [Hz],
and 4-19 Max Output Frequency
Check reference input signal scaling in
parameter group 6-0* 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.
Motor or panel has a short phase-to-phase.
Check motor and panel phases for shorts.
Motor is overloaded for the application.
Perform pre-start-up check for loose
connections.
Solution
Connect the motor and check the service
switch.
Apply mains power to run the unit.
Press [Auto On] or [Hand On] (depending
on operation mode) to run the motor.
Apply a valid start signal to start the
motor.
Apply 24 V on terminal 27 or programme
this terminal to No operation.
Programme 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.
Program correct settings.
Deactivate reversing signal.
See chapter 5.5 Checking Motor Rotation in
this manual.
Programme correct limits.
Programme correct settings.
Check settings in parameter group 1-6*
Load Depen. Setting. For closed loop
operation, check settings in parameter
group 20-0* Feedback.
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.
Eliminate any shorts detected.
Perform start-up test and verify that
motor current is within specifications. If
motor current is exceeding the nameplate
full-load current, the motor may run only
with reduced load. Review the specifi-
cations for the application.
Tighten loose connections.
MG33AP02