Alstom MBCH13 - Page 27

27
Flowchart 4
Link terminals
22 and 27.
Inject In into terminals
21 and 28
Link terminals 26 and 27.
Inject In into terminals
25 and 28.
Monitor TP4 (Note 3)
Monitor R1 (Note 6)
Inject In into terminals
25 and 28.
Link terminals
24 and 27.
Inject In into terminals
23 and 28
Conclusion:
Faulty pcb1
Conclusion:
Faulty pcb1, pcb2
or transformer T4
Conclusion:
Relay appears to be
functioning correctly
Conclusion:
Faulty pcb1, pcb2 or
transformer T3
NO
YES
NO
NO
NO
YES
YES
YES
TP4
voltage
correct ?
(note 3)
TP4
voltage
correct ?
(note 3)
TP4
voltage
correct
?
R1
voltage
correct
?
Monitor R1 (Note 6)
Inject In into terminals
23 and 28.
Conclusion:
Faulty pcb1
YES
R1
voltage
correct
?
Monitor R1 (Note 6)
Inject In into terminals
21 and 28.
Conclusion:
Faulty pcb1
Conclusion:
Faulty pcb1, pcb2 or
transformer T5
NO
YES
R1
voltage
correct
?
Is
the relay
an MBCH
06
version
?
Follow Flowchart 5
YES
NO
NO
YES
YES
YES
YES
YES
YES