Troubleshooting - Danfoss VLT AutomationDrive FC 301 Operating Instructions Manual

Maintenance, Diagnostics an...
ALARM 246, Power card supply
This alarm is only for enclosure size F frequency converters.
It is equivalent to Alarm 46. The report value in the alarm
log indicates which power module generated the alarm:
1 = inverter module to the far left.
2 = middle inverter module in F2 or F4 frequency
converter.
2 = right inverter module in F1 or F3 frequency
converter.
3 = right inverter module in F2 or F4 frequency
converter.
5 = rectifier module.

7.5 Troubleshooting

Symptom Possible Cause
Missing input power.
Missing or open fuses or circuit
breaker tripped.
No power to the LCP.
Shortcut on control voltage
(terminal 12 or 50) or at
control terminals.
Display
Incompatible LCP (LCP from
dark/No
®
VLT 2800 or 5000/6000/8000/
function
FCD or FCM).
Wrong contrast setting.
Display (LCP) is defective.
Internal voltage supply fault or
SMPS is defective.
Overloaded power supply
Intermittent (SMPS) due to improper control
display wiring or a fault within the
frequency converter.
MG33AP02
Operating Instructions
WARNING 250, New spare part
A component in the frequency converter has been
replaced.
Troubleshooting
•
WARNING 251, New typecode
The power card or other components have been replaced
and the typecode has been changed.
Troubleshooting
•
Test
See Table 4.4.
See open power fuses and tripped circuit
breakerin 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
terminal 50 to 55.
Test using a different LCP.
To rule out a problem in the control wiring,
disconnect all control wiring by removing the
terminal blocks.
Danfoss A/S © Rev. 07/2014 All rights reserved.
Reset the frequency converter for normal
operation.
Reset to remove the warning and resume normal
operation.
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).
▲
Press [Status] + [ ]/[
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.
7
▼
] to adjust the
47
7