Operating instructions

TM 11574A-OI
3-54
l. RU will not start or starts then stops.
(1) No power to unit.
Step Probable Cause Remedy
1 External power source OFF. Ensure external power source is ON.
If fault is not corrected proceed to step 2.
2 Start-Stop switch OFF or defective. Check start-stop switch is in the ON position
and not defective.
If fault is not corrected proceed to step 3.
3 Circuit breaker tripped or OFF. Check circuit breaker is set to ON.
If fault is not corrected proceed to step 4.
4 Autotransformer not connected. Ensure Autotransformer is connected IAW
2-17a(2).
If fault is not corrected proceed to a (2).
(2) Loss of control power.
Step Probable Cause Remedy
1 Circuit breaker OFF or defective. Check circuit breaker is set to ON.
If fault is not corrected proceed to step 2.
2 Control transformer defective. Replace control transformer IAW 3-
10b(18)(g).
If fault is not corrected proceed to step 3.
3 Fuses (F3A, F3B) blown. Check for blown fuses IAW WP 3-10b(18)(i).
Replace blown fuse IAW 3-10b(18)(j)
If fault is not corrected proceed to step 4.
4 Start-Stop switch OFF or defective. Check start-stop switch is in the ON position
and not defective IAW 3-10b(18)(l).
Replace defective start-stop switch IAW 3-
10b(18)(m).
If fault is not corrected proceed to a (3).