Alstom MBCH13 - Page 29

29
Flowchart 6
Conclusion:
Faulty pcb1, pcb2, or
transformers T1 or T2
Relay trips when
magnetizing inrush
current flows into the
power transformer
Monitor R2 (note 4).
Inject In into terminals
27 and 28
Monitor TP2 (note 7).
Inject 0.5In into
terminals 27 and 28
Conclusion:
Faulty pcb1 pcb2 or
transformer T1
Conclusion:
Faulty pcb1
YES
YES
YES
YES
YES
NO
NO
TP2
Voltage
correct
?
R2
Voltage
correct
?