SECTION 3: Trouble Shooting Guide
A. When any problem occurs the first thing to do is check all fuses that are involved in the trouble area. A blown fuse
can cause unusual operations and metering indications that are difficult to define.
B. The next thing to do is measure voltages at component terminals and thereby determine if the component is
functioning. For instance, there should be 120 volt at terminals 1 & 2 on the undervoltage relays when the generator
is running to keep the breaker from shunt tripping. If the voltage is present and yet the breaker shunt trips, the
undervoltage relay is probably faulty.
C. The following trouble shooting guide will be helpful:
SYMPTON
CHECK
CAUSE & REMEDY
Generator breaker shunt
Fuse F1, 2, 4
Fuse blown, replace
trip off and voltmeter
does not read on V1-2
while generator is
running, frequency meter
not working properly.
Generator breaker shunt
120 VAC at UVR
Replace UVR if 120
trip while engine is
volts is on terminals
running (no reverse
1 & 2
power)
Relay BR not operating
Jumper terminals
properly
TBS-3,4 for Generator
1. TBS-3,4 for
Generator 2. TBS-5, 6
for Generator 3.
If jumper corrects
problem replace relax.
BR
Trip shore power
breaker off if it is
On.
Shore power breaker
Check that all
Jumper TED4-7 to
will not close
Generator breakers
TBS-9. If breaker
are off
closes a "b" contact
in one of the
Generator breakers
is open. Check each
"b" contact on
TBB 1,2,&3 terminals
4 & 6
Check phase
Change leads on
rotation
shore power for
proper rotation.
