6.6 Troubleshooting
Symptom
Possible cause
Test
Solution
Display is dark
or not
functioning
Input power is missing
See the pre-start check list in the
VLT
®
Parallel Drive
Modules Installation Instructions
.
Check the input power source.
Fuses are missing or open, or
the circuit breaker has tripped
See
Open power fuses or tripped circuit breaker
in this
table for possible causes.
Follow the provided recommen-
dations.
No power to the LCP
Check the LCP cable for a faulty connection or
damage.
Replace the faulty LCP or
connection cable.
Short circuit on the control
voltage (terminal 12 or 50) or
at control terminals
Check the 24 V control voltage supply for terminals
12/13 to 20–39. Check 10 V supply for terminals 50–
55.
Wire the terminals properly.
Incompatible LCP (LCP from
VLT
®
2800 or 5000/6000/8000/
FCD or FCM)
Use only LCP 101 (P/N 130B1124)
or LCP 102 (P/N 130B1107).
Wrong contrast setting
Press [Status] + [
▲
]/[
▼
] to adjust
the contrast.
Defective display (LCP)
Test using a different LCP.
Replace the faulty LCP or
connection cable.
Faulty internal voltage supply
or defective SMPS
Contact a Danfoss supplier.
Intermittent
display
Overloaded supply (SMPS) due
to improper control wiring or a
fault within the drive system
To rule out a problem in the control wiring,
disconnect all control wiring by removing the
terminal blocks.
If the display stays lit, then the
problem is in the control wiring.
Check the wiring for short circuits
or incorrect connections. If the
display continues to cut out,
follow the procedure for
Display is
dark or not functioning
.
Motor is not
running
Service switch is open or the
motor connection is missing
Check that the motor is connected and that the
connection is not interrupted (by a service switch or
other device).
Connect the motor and then
check the service switch.
No mains power with the 24 V
DC option card
If the display is functioning but there is no output,
check that mains power is applied to the drive
system.
Run the unit by applying mains
power.
LCP stop
Check if [Off] has been pressed on the LCP.
Press [Auto On] or [Hand On]
(depending on the operating
mode) to run the motor.
Start signal is missing (Standby) Check
parameter 5-10 Terminal 18 Digital Input
for the
correct setting for terminal 18 (use the default
setting).
Start the motor by applying a
valid start signal.
Motor coast signal is active
(Coasting)
Check
parameter 5-12 Terminal 27 Digital Input
for the
correct setting for terminal 27 (use the 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?
•
Is preset reference active?
•
Is terminal connection correct?
•
Is scaling of terminals correct?
•
Is reference signal available?
Program the correct settings.
Check
parameter 3-13 Reference
Site
. Set the preset reference
active in
parameter group 3-1*
References
. Check for correct
wiring. Check the terminals for
scaling. Check the reference
signal.
Maintenance, Diagnostics, a...
VLT
®
Parallel Drive Modules
48
Danfoss A/S © 08/2017 All rights reserved.
MG37L202
6
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