Hobart 9OC24S Operation Manual page 173

gMOTOFl GENERATOR DIVISION
HOBART BROTHERS COMPANY
OPERATION, MAINTENANCE, AND OVERHAUL MAN.UAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
3. Engine-Generator Components Adjustment
A. Generator Adjustment
The 400-Hz generator is a brushless type requiring no adjustment of any kind.
B.
Generator Control Adjustments
The following items may require adjustment at some time during the life of the
equipment.
(1) Adjust manual voltage control, variable resistor.
The adjustment of this resistor (1, Fig. 5) determines the maximum generator
output voltage obtainable when using the manual control rheostat for voltage
controls. To adjust maximum voltage potential proceed as follows:
(a) Loosen slider-band clamping screw (D).
(b) Move the slider-band toward the single wire end (C) of theresistor to
increase voltage potential.
Move the band toward the double wire end
(E) (two wires connected) to decrease voltage potential.
(c) Tighten slider-band clamping screw when adjustment is completed.
(2) Adjust 115-V AC voltage regulator.
When a voltage regulator is first put into service, or when output (generator-
to-aircraft) cables are changed, the regulator may require up to five separate
adjustments. The five adjustments are for generator output voltage value,
damping gain, damping rate, line drop compensation gain, and line drop
compensation rate. See Figure 6 for identification of components used for
regulator adjustment.
(a) Adjust generator output voltage.
This is a relatively easy adiustment to make. With the generator running
at a rated speed (2400 RPM) and rated cycles-per-second (400 Hz), rotate
the rheostat knob (1) CLOCKWISE to INCREASE voltage and COUNTER-
CLOCKWISE to DECREASE voltage.
Observe the AC voltmeter and adjust
output voltage to 115 V AC.