Troubleshooting - Danfoss VLT FC 103 Operating Manual

Operating Guide | VLT® Refrigeration Drive FC 103

8.5 Troubleshooting

Table 41: Troubleshooting
Symptom Possible cause
Display dark/No Missing input power.
function
Missing or open fuses.
No power to the LCP.
Short circuit on control volt-
age (terminal 12 or 50) or at
control terminals.
Incompatible LCP (LCP from
®
VLT 2800 or 5000/6000/8000/
FCD or FCM).
Wrong contrast setting.
Display (LCP) is defective.
Internal voltage supply fault
or SMPS is defective.
Intermittent dis- Overloaded supply (SMPS)
play due to improper control wir-
ing or a fault within the AC
drive.
Motor not run- Service switch open or miss-
ning ing motor connection.
No mains power with 24 V DC
option card.
LCP stop.
Missing start signal (Standby).
Motor coast signal active
(Coasting).
Wrong reference signal
source.
124 | Danfoss A/S © 2020.01
Test
Check for loose connections.
See Open power fuses in this table
for possible causes.
Check the LCP cable for proper
connection or damage.
Check the 24 V control voltage
supply for terminal 12/13 to 20–39,
or 10 V supply for terminals 50–55.
–
–
Test using a different LCP.
–
To rule out a problem in the con-
trol wiring, disconnect all control
wiring by removing the terminal
blocks.
–
–
–
–
–
Check reference signal:
• Local
• Remote or bus reference?
• Preset reference active?
• Terminal connection correct?
• Scaling of terminals correct?
• Reference signal available?
Maintenance, Diagnostics, and
Troubleshooting
Solution
Check the input power source.
Follow the recommendations provided.
Replace the faulty LCP or connection
cable.
Wire the terminals properly.
Use only LCP 101 (P/N 130B1124) or
LCP 102 (P/N. 130B1107).
To adjust the contrast, press [Status] +
[▲]/[▼].
Replace the faulty LCP or connection
cable.
Contact supplier.
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.
Connect the motor and check the serv-
ice switch.
Apply mains power.
Depending on the operating mode,
press [Auto On] or [Hand On].
Apply a valid start signal.
Apply 24 V on terminal 27 or program
this terminal to [0] No operation.
Program correct settings. Check param-
eter 3-13 Reference Site. Set preset refer-
ence active in parameter group 3-1* Ref-
erences. Check for correct wiring. Check
scaling of terminals. Check reference
signal.
AQ275652766279en-000101 / 130R0707