OM 2012
(c) Meter switch (5) may be in any pcsition except pointing straight DOWN. ’
(2) Connect output cable plug connects to aircraft receptacle. Be sure ctinnectas
are mated fully and secue ly.
.
E.
Power Delivery (Automatic Voltage Co&of)
(1)
Place engine-generator control switch (18, Fig. 1) in Bu I LD-U P-VOLTAGE pas it ion
momentarily, then allow it to position itself in GEN pbsition. The electric gov-
erncr will. immediately increase engine speed fo 2000 RPM and maintain it.
(2) Observe generator instruments.
Frequency meter (1, Fig. 1) should indicate
exactly 400 Hr. Voltmeter (2) should indicate 115 V AC when line switch (6)
is in LINE-TO-NEUTRAL position.
(3) The final step in delivering power is closing the load contactor. When satisfacto~
frequency and voltage values are indicated by the instruments, close the load con-
.’
tactor by momentarily placing the load contactor control switch (20) in the-tap
(jprirlg kxded), CLOSE position.
The green indicating light (22) should glow at .
once to indicate that the foad cantactor is closed ad power is available at the
aircraft. Ps soon OS the light gbws, release the switch.
It will automatically
ret,um to the center ON position.
NOTE:
If the indicating light (22) should “go-out” as saon as the switch
’
is released, and no fault jighis are ON, it indicates that 28.5-V
DC holding current is not being supplied from the aircraft ta the
plugtinteriock relay.
Correct the’ condition and 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 phose.
Use the line switch (6) to select line-to-line or iine-ta-
neutral voltage.
if the food is changing, it is goad operating practice to ob-
seme the instruments until toad conditions stabilize.
(5) A condition of overvoltage, undervoltage, under-frequency, averfrequency, or
overload in the output circuit will automatically open the load contactor and
turn on the applicable indicating light to signal the operator which of the
abave fau!ts caused the protective monito’r system to operate. After the fault
has been corrected, press the reset switch (7) to turn off the indicating light
and reset the protective relay system.
Proceed with power delivery by operating
the load contactor switch.
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