12-25. PARALLEL OPERATION (REAL POWER).
For 0% Droop Sets.
Place the ISOCHRONOUS/FREQUENCY DROOP switch in the ISOCHRONOUS position.
With the rated (750 kW, 0.8 pF lagging) load on the generator set, measure the dc voltage across pins A
and B of one of the paralleling receptacles. Adjust the GAIN potentiometer, located on load sharing panel
A101, until 5 V dc is indicated. Ensure that pin A is positive. For decrease in load, voltage will decrease
For 3% Droop Sets.
Place ISOCHRONOUS/FREQUENCY DROOP switch, located on control panel B, in the DROOP position.
Adjust the DROOP potentiometer, located on load sharing panel A101, for 3 percent frequency droop
between no load and rated load.
12-26. PARALLEL OPERATION (REACTIVE POWER).
Remove the shorting plug.
With the rated load (750 kW. 0.8 pF lagging) on the generator set, and the PARALLEL switch, located on the
generator control panel, in the PARALLEL position, adjust the voltage ADJ rheostat R105, located in cabinet A,
until 7.2 V ac is indicated across pins A and B of one of the paralleling receptacles. For a decrease in load, the
voltage will decrease proportionately.
Install the shorting plug.
With a 750 kW, 0.8 power factor lagging load applied, the voltage change from no load should be approximately
3 percent. Adjust R105 accordingly.
12-27. MAXIMUM POWER TEST.
General. The maximum power of a generator set is a function of the ambient condition (temperature and
altitude) and the mechanical condition of the engine at any particular time. See Table 12-3 for test parameters
for various altitudes.
Apparatus. Instrumentation for measuring load conditions, pressures, and temperatures shall be as illustrated in
Figure 12-3 and Figure 12-5.
This procedure subjects the generator set to a severe overload which may be damaging If
maintained for too long a period of time.
Preparation for test.
(a) Connect the load and instrumentation in accordance with Figure 12-3 and Figure 12-5 for one
voltage and frequency.
(b) Install appropriate thermocouples to measure the following temperatures:
1 Lubricating oil sump.
2 Engine intake air (located at the inlet of the intake manifold).
Obtain and record the barometric water vapor pressures (see MIL-HDBK-705, Method 220.2).
Connect the set to a source of fuel containing number 2 diesel fuel VV-F-800.