ARMY TM 9-6115-645-24
AIR FORCE TO 35C2-3-444-12
MARINE CORPS TM 09244A/09245A-24/2
aa.
Adjust INTEG potentiometer on governor control unit dock-wise to decrease recovery time of load transients.
ab.
Adjust LOAD PULSE potentiometer on governor control unit dock-wise to decrease frequency overshoot and
undershoot and to decrease recovery time of overshoot/undershoot transients. ac. Start generator set.
NOTE
Steps w.(1) and w.(2) are not required when doing step ad
ad.
Repeat steps v. through x. until generator set meets performance requirements stated in step z
ae.
Apply and remove 75 percent rated load to generator set at 40-second intervals. Repeat this step two more times.
af.
Apply and remove 50 percent rated load to generator set at 40-second intervals. Repeat this step two more times.
ag.
Apply and remove 25 percent rated load to generator set at 40-second intervals. Repeat this step two more times.
ah
Shut down generator set and turn off strip chart recorder.
ai.
Examine voltage and frequency strip chart for the following performance criteria:
(1) Frequency regulation shall not exceed 1/4 of one percent of rated frequency.
(2) Frequency short-term stability (30 seconds), frequency will remain constant within a band width equal to 1/2
of 1 percent rated frequency, without repetitive frequency variations (hunting).
(3) The generator set will reestablish stable engine operation within two seconds of a sudden load change (i.e.,
from a load to no-load condition) (within one second for 400 Hz units). The maximum transient frequency
change above (overshoot) and below (undershoot) the new steady state frequency shall not be more than
four percent of rated frequency (not more than 1-1/2 percent for 400 Hz units).
aj.
Disconnect load bank and dose load terminal board access door.
ak
Disconnect frequency counter, and voltage and frequency recorder from voltage reconnection terminal board. al.
Install voltage reconnection terminal board cover and dose output box access door.
4-3.4
Replacement.
a.
Remove governor control unit, paragraph 2-61.2.
b.
Install new governor control unit, paragraph 2-61.3.
c.
Perform adjustment of governor control unit, paragraph 4-3.2.
4-4
CONTROI BOX HARNESS.
4-4.1
Removal.
a.
Shut down generator set.
b.
Open battery access door and disconnect negative battery cable.
c.
Remove control box assembly, paragraph 2-19.2.
d.
Remove voltage sensing relay, paragraph 2-59.3.
e.
Remove relays, paragraph 2-60.3.
f.
Remove screws (4, FIGURE 4-3), washers (5), insulators (6), and clips (7).
g.
Tag and remove sockets (8) from tracks (9).
h.
Remove screws (10) and nuts (11) to free terminal boards (12).
i.
Tag and disconnect electrical leads from AC voltage regulator (2) and governor control unit (3).
j.
Tag and disconnect electrical leads from shunt (43, FIGURE 2-14), BATTERY CHARGER FUSE assembly
(32), DC CONTROL POWER circuit breaker (35), REACTIVE CURRENT ADJUST rheostat (3), LOAD
SHARING ADJUST rheostat (7), FREQUENCY SELECT switch (14), OVERSPEED RESET switch (10),
over/under
4-8 Change 2
