Symptom
Possible cause
Test
Solution
Intermittent
display
Overloaded supply (SMPS) due
to improper control wiring or a
fault within the frequency
converter.
To rule out a problem in the control wiring,
disconnect all control wiring by removing the
terminal blocks.
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.
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 devise).
Connect the motor and check the service
switch.
No mains power with 24 V DC
option card.
If the display is functioning, but there is no
output, check that mains power is applied to
the frequency converter.
Apply mains power to run the unit.
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
for 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 for terminal 27 (use default
setting).
Apply 24 V on terminal 27 or programme
this terminal to
[0] No operation.
Wrong reference signal source.
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.
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.
Motor
running in
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.
–
See
chapter 5.5 Checking Motor Rotation
in
this manual.
Motor is not
reaching
maximum
speed
Frequency limits set wrong.
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
Programme correct limits.
Reference input signal not
scaled correctly.
Check reference input signal scaling in
parameter group
6-0* Analog I/O mode
and
parameter group
3-1* References.
Programme correct settings.
Motor speed
unstable
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
Overmagnetisation.
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
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
.
Maintenance, Diagnostics, a...
VLT
®
AutomationDrive FC 301/302
48
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MG33AQ02
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Summary of Contents for VLT AutomationDrive FC 301
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