OM 2012
9.
8.
Theory of Operation
Wire leads are connected to the electrical circuitry of the generator set at various
points and routed to a receptacle connector,
mounted on the engine control panel.
They are connected to the test box rotary switch by a plug connector and wiring
harness.
The rotary selector switch is wired in such a manner that for any switch position, two
pre-selected test points in the generator set circuitry are connected for testing. The
selector switch may be rotated to any one of 22 positions, however not all positions
are used in this installation. An instruction plate mounted under the switch knob in-
dicates switch positions and component tested’ in each position. Normal voltage for
each test is also indicated.
Two test jacks are provided for connection of the test prods of a voltmeter. After
the voltmeter is connected and selector switch positioned, the test circuit is closed
by pressing the pushbutton switch.
A voltage value may then be observed on the
voltmeter. This arrarlgement prevents energization of test circuitry and equipment
for extended periods and allows the operator to reset and adjust the voltmeter with-
out disconnecting it from the box.
For operating instructionr, see Sect. T-3, Para. 3.
53590-q)
The generator*& identified as Specification Nunber 5359&q is the same as 5359@1
except for the addition of a Rodio Frequency Interference (RF I) Suppression Kit, Hobart
Part Number 482337, and a 24 Volt Power Supply Kit, Hobart Part Nunber 435262. ’
A. RFI Suppression Kit
The RFI suppression kit is attached to the engine’s governor control vnit (9, Fig. 3)
as shown in Figure 15.
6. 24 Volt DC Power Supply Kit
NOTE: Generator sets with Serial Number 8OPSO1501 and higher, have
had the power supply kit installed at the factory. Units with
Serial Nunbers lower than80PS01501 were shipped from the
factory without the power supply. However, these units may
be modified in the field to include the kit. Order Hobart
Part Number 435262.
Certain aircraft require a 24 volt DC signal on their input power receptacle (Pin E)
as a condition for receiving 115 volt AC, 400 Hz input from the ground power gen-
erator set.
This power supply furnishes that 24 volt DC signal.
The fzower supply
(22, Fig. 3) is mounted on support brackets directly above the power modvie panel
(7). All components except the fuse are enclosed within a sheet metal cover. The
1-l
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Avg 25Q5
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