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OM-2031
NOTE: If the indicating light (22) should "go-out" as soon as the switch is released, and no fault lights
are ON, it indicates that 28.5-V DC holding current is not being supplied from the aircraft to the
plug-interlock relay. Correct the condition an again operate the load contactor control switch (20) as
above.
(4) It is recommended that the operator check output voltage and current in each of the three phases
early in the power delivery run. Use the meter switch (5) to select the phase. Use the line switch (6) to
select line-to-line or line-to-neutral voltage. If the load is changing, it is good operating practice to ob-
serve the instruments until load conditions stabilize.
(5) A condition of overvoltage, undervoltage, underfrequency, overfrequency, or overload in the out-
put circuit will automatically open the load contactor and turn on the applicable indicating light to sig-
nal the operator which of the above faults caused the protective monitor system to operate. After the
fault has been corrected, press the reset switch (7) to turn off the indicating light and reset the protec-
tive relay system. Proceed with power delivery by operating the load contactor switch.
F. Preparation for Power Delivery (Manual Voltage Control)
Preparation for power delivery using manual voltage control is exactly the same as for automatic con-
trol [Para. 2, D, (1) thru (2) above] except:
(1) Place automatic-manual switch (33) in MANUAL position.
(2) Set the manual voltage control rheostat (32) near its mid-range position.
G. Power Delivery (Manual Voltage Control)
Power delivery 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 (32) to maintain a steady 115-V AC
reading on the voltmeter (2). Turn the rheostat (32) knob CLOCKWISE to INCREASE voltage and
COUNTERCLOCKWISE to DECREASE voltage.
(2) Adjust voltage to 115 V AC.
(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 (20) in OFF position. Green light (22) 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 (18) in IDLE position.
(3) Disconnect output cable from aircraft.
WARNING: HIGH VOLTAGE - ELECTRIC SHOCK OR FIRE CAN KILL! NEVER
DISCONNECT THE OUTPUT CABLE WHILE POWER IS BEING DELIVERED.
K. Stopping the Engine
(1) Allow the engine to idle a few minutes before stopping, to permit cooling.
(2) To stop the engine, move the START-RUN-STOP switch (30) to the STOP (down) position.
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Page 6
October 1/95 Revised
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