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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
f.
Preparation for Power Delivery (Manual Voltage Control)
Preparation for power delivery using manual voltage is exactly the same as for automatic control
[Para. 2, B, (1) thru (2) above] except:
(1) Place automatic-manual switch (31) in MANUAL position.
(2) Set the manual voltage control rheostat (30) near its mid-range position.
g. Power Delivery (Manual Voltage Control)
Power deliver using manual voltage control is the same as automatic delivery [para. E, (1) thru (5)
above] except:
(1) Control generator output voltage by adjusting the rheostat (30, Fig. 1) to maintain a steady
115-VAC reading on the voltmeter (3) . Turn the rheostat (30) knob CLOCKWISE to
INCREASE voltage and COUNTERCLOCKWISE to DECREASE voltage.
(2) Adjust voltage to 115 VAC.
(3) During manual power delivery the operator must remain with the generator set to adjust output
voltage for varying loads and conditions.
h. Discontinue Power Delivery
(1) Place the load contactor switch (21) in OFF position. Green light (23) should go OFF
immediately to indicate that the load contactor has opened and power is no longer being
delivered to the aircraft.
(2) Place engine-generator control switch (21) in IDLE position.
(3) Disconnect output cable from aircraft.
WARNING
i.
Stopping the Engine
(1) Allow the engine to idle a few minutes before stopping to permit cooling.
(2) To stop the engine, move switch to stop position (26) .
3. Test Box Operation
The test box is useful and convenient in testing the generator set after repair or overhaul and also in
troubleshooting. To operate the test box, proceed as follows:
a. Open left, front canopy doors and connect the test box plug connector (see 1-1; 3, Figure
14) to the test receptacle connector (Fig. 4).
b. Connect the test probes of a voltmeter of the test jacks (3 and 4, Fig.3) . Test jacks are color
coded. Red indicates POSITIVE. BLACK indicates NEGATIVE.
c. Locate the component or circuit to be tested in the DESCRIPTION column on the instruction
plate and set the selector switch (1, Fig. 3) to the number indicated opposite the description.
d. Note the normal voltage value and kind of current (AC or DC) to be expected at the position
and set voltmeter accordingly.
Chapter 1-3
Page 8
High voltage! Electric shock or fire can kill! Never disconnect the output cable
while power is being delivered.
March 31/94 Revised
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