7.5 Troubleshooting
Symptom Possible Cause Test Solution
Display
dark/No
function
Missing input power.
See Table 4.4.
Check the input power source.
Missing or open fuses or circuit
breaker tripped.
See open power fuses and tripped circuit
breaker in this table for possible causes.
Follow the recommendations provided.
No power to the LCP. Check the LCP cable for proper connection or
damage.
Replace the faulty LCP or connection
cable.
Shortcut on control voltage
(terminal 12 or 50) or at
control terminals.
Check the 24 V control voltage supply for
terminal 12/13 to 20–39 or 10 V supply for
terminal 50 to 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.
Display (LCP) is defective. Test using a different LCP. Replace the faulty LCP or connection
cable.
Internal voltage supply fault or
SMPS is defective.
Contact supplier.
Intermittent
display
Overloaded power supply
(SMPS) due to improper control
wiring or a fault within the
adjustable frequency drive.
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.
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 device).
Connect the motor and check the service
switch.
No line power with 24 V DC
option card.
If the display is functioning, but there is no
output, check that line power is applied to
the adjustable frequency drive.
Apply line power to run the unit.
LCP Stop. Check if [Off] has been pressed. Press [Auto On] or [Hand On] (depending
on operation mode) to run the motor.
Missing start signal (Standby).
Check 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 5-12 Terminal 27 Digital Input for
correct setting for terminal 27 (use 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? Preset reference active? Terminal
connection correct? Scaling of terminals
correct? Reference signal available?
Program 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.
Motor
running in
wrong
direction
Motor rotation limit.
Check that 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.
Maintenance, Diagnostics an... Instruction Manual
50 Danfoss A/S © Rev. 09/2014 All rights reserved. MG33AP22
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