TM 55-1730-229-12
TO 35C2-3-473-1
28 vdc to the coil of ac output con-
limits. If the switch closes, the GCU
tactor K1. When the AC POWER switch
system logic illuminates COMPT/GEN HI
1S10 is set to ON, the contactor is
caution lamp 1DS11. This lamp is also
illuminated when the electrical com-
energized and connects the generator
ac outputs to the ac output cable,
partment temperature switch S1E is
closed.
and to convenience receptacles J1-J4.
Each convenience receptacle is pro-
(2) If the CURRENT LIMIT SELECTOR
tected by a 15 amp circuit breaker.
switch 1S11 is in any AC position and
The contactor also provides a ground
there are no ac voltage or over-current
to illuminate AC POWER ON lamp 1DS20.
faults, the GCU system logic applies
Generator DC Faults, 83-360A Only.
Fault
Fault Lamp
Indication
Fault Lamp
Voltage
Current for CURRENT LIMIT
(latched)
Indication
Protective
SELECTOR
After
During
Action
Switch Settings
Fault
Fault
200A
500A
700A
1000A
Normal (22-
>200
>500
>700
None (see
None
None
32 vdc)
<1000
<1000 <1000
note)
OVER
VOLTAGE
>1000
>1000 >1000 >1000
Field
CURRENT
FAULT
excitation
after 5
remove after
second
30 seconds
delay
<22 vdc
<200
<500
<700
<1000
None
VOLTAGE
DC contactor
>200
>500
>700
FAULT
opened after
OVER
<1000
<1000
<1000
4-7 seconds
CURRENT
>1000
>1000
>1000
>1000
>32 vdc
DC contactor
None
VOLTAGE
opened
FAULT
Ripple High
DC contactor
None
VOLTAGE
opened
FAULT
Note:
When voltage is within nominal limits and output current is less than
1000 amps, the generator will continue to operate regardless of CURRENT LIMIT
SELECTOR switch setting. The GCU will reduce field excitation to reduce
generator voltage as current increases above the selected limit. The voltage
will drop below the normal limit (21 1 vdc) and the GCU will open the dc
contactor when current exceeds the values listed below:
CURRENT LIMIT SELECTOR
Switch Setting
Actual Current Limit
200A
255 to 280 amps
500A
635 to 700 amps
700A
955 to 1000 amps
Note: > indicates greater than, < indicates less than, < indicates equal to or
less than.
