9 Basic Troubleshooting
9.1 Start Up and Operation
Symptom
Possible Cause
Test
Solution
Display dark / No function
Missing input power
See
Table 3.1
.
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 terminal 12/13 to 20-39
or 10 V supply for terminal 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 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, 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 Troubleshooting
VLT® Automation VT Drive FC 322 D-Frame Instruction Manual
MG21E122 - VLT® is a registered Danfoss trademark
9-1
9
9
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