Troubleshooting - Danfoss VLT FC 102 User Manual

Maintenance, Diagnostics, a...

6.6 Troubleshooting

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