Hobart 9OC24S Operation Manual page 84

GENERATOR DIVISION
HOBART BROTHERS COMPANY
OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
NOTE: If operating mode switch is NOT in GEN position when cable plug
connector is removed from box, the engine wil I STOP.
(2) Observe generator instruments. Frequency meter (29) should indicate 400 Hz.
Voltmeter (30) should indicate 115-V AC when line switch (35) is in LINE-TO-
NEUTRAL position.
(3) Remove cable plug connector from plug box (Ref. 1-2, Fig. 3) and connect to
aircraft receptacle connector (see NOTE above).
(4) The final step in delivering power is closing the load contactor. When satisfactory
frequency and voltage values are indicated by the instruments, close the load con-
tactor by momentarily placing the load contactor control switch (17) in the top
(spring loaded), ON position. The green indicating light (12) should glow at
once to indicate that the load contactor is closed and power is available at the
aircraft . As soon as the light (12) gl ows, release the switch (17). It will auto-
matically return to the center ON position.
NOTE:
If the indicating lights (12) should "go-out" as soon as the switch (17) 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 re-
lay. Correct the condition and again operate the load contactor con-
trol switch (17) as above.
(5) 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 (34) to
select the phase. Use the line switch (35) to select line-to-line or Iine-to-
neutral voltage. If the load is changing, it is good operating practice to ob-
serve the instruments until load conditions stabilize.
(6) A condition of overvoltage, undervoltage, underfrequency, overfrequency, or
overload in the output circuit will automatically open the load contactor and
turn on the applicable indicating light (36) to signal the operator which of the
above faults caused the protective monitor system to operate. After the fault
has been corrected, press the reset switch (39) to turn off the indicating, light
and reset the protective relay system. Proceed with power delivery by operating
the load contactor switch (17).
G. Preparation for Power Delivery (Manual Voltage Control)
Preparation for power delivery using manual voltage control is exactly the same as
for automatic control (Para. 3, E, 1, above) except:
(1) Place automatic-manual switch (33) in MANUAL position.
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