ARMY TM 9-6115645-24
AIR FORCE TO 35C2-344412
MARINE CORPS TM 09244A/09245A-24/2
4-3.3
Adjustment.
a.
Shut down generator set.
b.
Open output box access door, remove cover from voltage reconnection terminal board and attach voltage and
frequency recorder to terminals 9 and 12 of voltage reconnection terminal board.
NOTE
The following procedures require monitoring frequency, voltage, current, and power. All readings except for
frequencies will utilize the generator set control panel gages. However, since the designed over speed trip
frequency is greater than the range of the control panel FREQUENCY meter (HERTZ), a frequency counter will be
required.
c.
Attach frequency counter to voltage reconnection terminal board terminals 9 and 12.
d.
Open load terminal board access door and attach load bank to generator set (four wire connection).
NOTE
Ensure load bank and generator set voltage reconnections are set for same configuration (i.e., 120/208 or 240/416
VAC).
e.
Check for proper adjustment of governor actuator, paragraph 4-15.4. Adjust as necessary.
f.
Check for proper adjustment of magnetic pickup, paragraph 2-109.4. Adjust as necessary.
g.
Lower generator set control panel and turn INTEG, GOV GAIN, and LOAD PULSE potentiometer on governor
control unit to their full counterclockwise positions.
NOTE
It is necessary to adjust fuel injection pump high idle stop screw to allow increased engine idle speed for over
speed test. Record number of turns so screw can be reset after test.
h.
Loosen jam nut (1, FIGURE 4-2) and back out high idle stop screw (2) on fuel injection pump.
FIGURE 4-2. Fuel Injection Pump High Idle Speed Adjustment
i.
Start generator set and operate at rated voltage and frequency.
j.
Observing frequency counter, slowly increase operating frequency of generator set by turning governor control unit
FREQ range potentiometer clockwise until frequency counter indicates between 65.94 and 66.06 Hz (MEP-806A)
or between 436 and 444 Hz (MEP-816A). At this point generator set has reached over speed trip frequency and
generator set should shut down.
NOTE
Perform steps k and I. if generator set does not shut down within limits noted in step j. Otherwise, proceed to step
m.
k
If generator set has not shut down at upper limit of frequency noted in step j., proceed as follows:
4-6 Change 2
