Alstom MBCH13 - Flowchart 1

24
Flowchart 1
Check that auxiliary
dc supply voltage and
polarity are correct
Isolate auxiliary dc voltage.
Remove module from case.
Make external connections
to module terminal block
Conclusion:
Auxiliary dc circuit appears
to be working correctly.
Conclusion:
Faulty pcb1
Apply correct auxiliary
dc voltage.
Check internal dc rails
Conclusion:
Internal wiring faulty
and/or pcb 1, 2 or 3 faulty.
Is
relay
operation on
magnetising
inrush current
incorrect.
Correct
?
Check auxiliary dc
current drain
Correct
?
Correct
?
Follow Flowchart 6
Follow Flowchart 2
Apply correct
dc voltage
Suspected faulty
module
NO
NO
NO
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES