10 Basic Start-up Troubleshooting
10.1 Start-up and Operation
Symptom Possible cause Test Solution
Display dark/No function
Missing input power
See Table 4.1
Check the input power source
Missing or open fuses or circuit
breaker tripped
See open 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 terminals 12/13 to 20-39
or 10 V supply for terminals 50 to
55
Wire the terminals properly
Wrong 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, then 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
Basic Start-up Troubleshoot... Instruction Manual
146 Danfoss A/S © Rev. 2014-02-07 All rights reserved. MG37A222
1010
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