Troubleshooting - Danfoss VLT HVAC Drive FC 102 Operating Manual

Operating Guide | VLT® HVAC Drive FC 102
9.3.102 ALARM 427, FPC Supply
Cause
Supply voltage fault (5 V, 24 V, or 48 V) on fan power card is detected.

Troubleshooting

• Check fan power card wiring.
• Replace fan power card.
9.4 Troubleshooting
Table 74: 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) due
play to improper control wiring or
a fault within the AC drive.
154 | Danfoss A/S © 2018.10
Test
See 6.1 Pre-start Check List.
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.
Maintenance, Diagnostics, and
Troubleshooting
Solution
Check the input power source.
Follow the recommendations provi-
ded.
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] + [▲]/[▼] to adjust the
contrast.
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.
AQ262141314214en-000101 / 130R0880