ABB OmniCore V400XT Product Manual page 347

Look at the following block diagram to understand how power is connected from
incoming and forward.
Troubleshooting flowchart
xx2100001064
Product manual - OmniCore V400XT
3HAC081697-001 Revision: A
No LEDs are lit
Check
mains switch Q0
Check input power
Check
mains connection X0
Check AC input cable
Check Q0 power out
Check fuse F1
Check A1.X1
Check LED status
Not lit
Problem solved
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7.2.1 No LEDs are lit on the controller
Off
On
Abnormal
Normal
Connection
not ok
Connection ok
Broken cable
Cable ok
Abnormal
Ok
Abnormal
Ok
Abnormal
Ok
Not lit
Lit
7 Troubleshooting
Continued
Switch on Q0
Troubleshoot
incoming power
Repair
connection
Replace cable
Replace Q0
Replace fuse F1
Troubleshoot
power unit
Troubleshoot
LEDs
Continues on next page
347