TM 5-6115-593-34
NAVFAC P-8-631-34
TO-35C2-3-463-2
when the low fuel protective device actuates and shuts down the set.
(7)
If the low protective device does not actuate within an hour after the LOW FUEL ENGINE FAULT indicator
lights up, the device is faulty. Shut down the generator set immediately and replace the low fuel protective
device.
16-10. PARALLEL OPERATION PROVISIONS (Real Power).
a.
For 0% Droop Sets:
(1)
Place the FREQUENCY DROOP-ISOCHRONOUS switch in the ISOCHRONOUS position.
(2)
With rated (500 kw) load on the generator set, measure the DC voltage across pins A and B of one of the
paralleling receptacles. Adjust the LOAD GAIN potentiometer, located on the electronic governor
controller, until 5 volts DC is indicated. Ensure that pin A is positive. For decrease in load, voltage will
decrease proportionately.
b.
For 3% Droop Sets:
(1)
Place FREQUENCY DROOP-ISOCHRONOUS switch, located on the AC-DC control panel, in the DROOP
position.
(2)
Adjust the DROOP potentiometer, located on the electronic governor controller for 3 percent droop.
16-11. PARALLEL OPERATION PROVISION (Reactive Power).
a.
Remove the shorting plug.
b.
With rated load 500 kw at 0.8 PF on the generator set, and the PARALLEL OPERATION-SINGLE UNIT
OPERATION switch, located on the generator panel, in the PARALLEL OPERATION position, adjust the
REACTIVE LOAD COMPENSATION TM5-6115-593-34 NAVFAC P-8-631-34 TO-35C2-3-463-2 CONTROL,
located on AC-DC control panel, until 7.2 volts AC is indicated across pins A and B of one of the paralleling
receptacles. For decrease in load, voltage will decrease proportionately.
c.
Install the shorting plug.
d.
With 500 KW 0.8 PF load applied, the voltage change from no load should be approximately 3 percent.
16-12. MALFUNCTION INDICATOR TEST.
a.
The malfunction indicator system is electrically insolated and independent of the protection system. Testing of
the indicators can be accomplished at the same time that the protective devices are tested in tests 3, 5, 6, 7, 8,
9, 10, 11, 12, and 13 of table 16-1.
b.
In the event that one of the indicator circuits does not work, verify that the lamp is functional by operating the
ANNUNCIATOR TEST switch located on the generator panel.
16-13. PHASE BALANCE TEST VOLTAGE.
a.
General. Polyphase electrical equipment may not operate properly or may be damaged if the phase voltages of
a polyphase generator differ greatly from each other. Also, large differences between the phase voltages of a
polyphase generator may be an indication that the generator set has been improperly manufactured or damaged.
b.
Apparatus. An rms indicating AC voltmeter, having an accuracy of ±0.1 percent of reading, is required.
c.
Test.
(1)
Start and operate the generator at rated frequency and at no load.
(2)
Adjust the excitation so that any one of the output voltages is at rated power.
(3)
Read and record the
16-5
