Danfoss VLT AutomationDrive FC 301 Operating Instructions Manual page 50

Maintenance, Diagnostics, a...
Symptom
Intermittent
display
7 7
Motor not
running
Motor
running in
wrong
direction
Motor is not
reaching
maximum
speed
Motor speed
unstable
Motor runs
rough
Motor does
not brake
48
Possible cause
Overloaded supply (SMPS) due
to improper control wiring or a
fault within the frequency
converter.
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.
Incorrect parameter settings.
Overmagnetisation.
Incorrect settings in the brake
parameters. Possible too short
ramp-down times.
Danfoss A/S © 07/2015 All rights reserved.
®
VLT AutomationDrive FC 301/302
Test
To rule out a problem in the control wiring,
disconnect all control wiring by removing the
terminal blocks.
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 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).
Determine which reference type is active
(local, remote, or fieldbus) and check the
following points:
•
Preset reference (active or not).
•
Terminal connection.
•
Scaling of terminals.
•
Reference signal.
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.
–
Check output limits in parameter 4-13 Motor
Speed High Limit [RPM], parameter 4-14 Motor
Speed High Limit [Hz], and parameter 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.
Solution
If the display stays lit, the problem is in
the control wiring. Check the wiring for
shorts or incorrect connections. If the
display continues to cut out, follow the
procedure for Display dark\No function in
this table.
Connect the motor and check the service
switch.
Apply mains power to run the unit.
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 programme
this terminal to [0] No operation.
Programme correct settings. Check
parameter 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.
MG33AQ02