TM 5-6115-465-34
TO 36C2-3-446-2
NAVFAC P-8-625-34
TM 06858B/06859D-34
as in the Operator and Organizational Maintenance
7-10. PARALLEL OPERATION PROVISIONS.
Manual.
a. For Class 1 (Precise) Sets (Real Power):
e. All test results for generator set overhaul, shall
(1) Remove the shorting plug.
be logged on the appropriate forms as required,
(2) With rated (30 kw) load on the generator set,
measure the dc voltage across pins A and B of one of
f. Perform the operating tests as indicated in
R28 (located on the precise relay box) until correct
*VDC is indicated, Ensure that correct *pin is
7-7. DIRECTION OF ROTATION CONTROLS.
positive.
With the generator set running at a rated load,
Positive
VDC
rotate the following controls and verify their proper
* A.B
Governor Type
* Pin
operation.
Electric
4
B
a. Frequency Adjust Control. On Class 1 sets
Electro-Hydraulic
4
A
clockwise rotation of the frequency adjust control
rheostat must cause set frequency to increase as
indicated on the frequency meter. On Class 2 sets
counterclockwise rotation of manual speed control
(1) Remove the shorting plug.
must increase frequency.
(2) With rated (30 kw) load applied wih a .8 PF
b. Voltage Adjust Control. Clockwise rotation of
and the operation switch in the parallel position, meas-
the voltage adjust control must cause set voltage to
ure the ac voltage across pins C and D of one of the
(located on the special relay box) until 6 volts ac is
c. Governor Paralleling Control (Class 1 Sets Only).
achieved.
Counterclockwise rotation of the governor paralleling
control must cause an increase in the signal appearing
c. For Class 2 (Utility) Sets (Real Power), adjust
at the paralleling receptacles.
governor droop as follows:
d. Voltage Regulator Paralleling Control. Clockwise
(1) Start and run engine until it reaches operating
rotation of the voltage regulator paralleling control
temperature.
must cause that set to increase its share of the total
(2) With rated (30 kw) load applied and the en-
reactive Kva.
gine operating at rated speed, droop may be determined
by removing load and noting no-load frequency.
7-8. REVERSE POWER PROTECTIVE DEVICE
TEST.
a. Operate two generator sets in parallel at no load,
located at the rear of the fuel pump, until the difference
in frequency between no-load and full load is 3 percent.
with contractors closed.
Note the increase of hertz when load is removed. At 60
b. Lower speed of set being tested until the main
Hz, droop should be 1.8 Hz, and at 400 Hz, droop
contactor opens.
should be 12.0 Hz.
c. Record the value on the kilowatt meter of the
other set at the moment the contactor opens. The
(1) Start and run engine until it reaches operating
load contactor of the set under test must open when
temperature.
power flow into the generator exceeds 20 percent of
the rated value.
(2) Install shorting plug.
7-9. LOW FUEL PROTECTIVE DEVICE.
(3) With rated (30 kw) load applied at .8 PF and
the generator operating at rated voltage, voltage droop
a. Disconnect cable to the day tank fuel solenoid
may be determined by removing the load and noting the
valve.
difference between full-load and no-load voltage.
b. Operate generator set at full load.
(4) Adjust R29 (located on the special relay box)
c. The low fuel protective device must operate
until the difference in voltage between no-load and full
load is 3 percent. Note the increase of volts when load
when the fuel in the day tank falls to a point at which
is removed. At 120 volts, droop should be 3.6 volts.
there is only enough to operate the set at rated load
for one minute.
7-11. Deleted.
Change 7
7-2