Hobart 5359D Operation And Maintenance Manual page 39

OM 2012
ThC
400-l-Jz c~Cnr?rato:. is a brushless,
revolviny field, three-phase, alternating cur-
rcn; type.
The PC~CJT
c;;emllly is mounted by INQ, p~~mcrt~r,:ly fub;icutcd, Seafed,
bal I bearings.
The front bearing is supported by the fan housing; thr? rear beo;ing
is mounted in the exciter housing. Both of ther,e housings ore attached to t!lo main
generat-or stator hcusin~. The front end of the roior shafi extends forwai.c.l !>c:yond
the
bearing and is attached to tI:e engine flyv+huel by a hub and flexible r!isc
COU~!iliJ @'ss~!l?bl~.
The rear end of the rotor shaft extends rearword beyond the
rear bearing and into the exciter stutor housing.
The exciter rotor is mounted on
t!lis shaft extension with a Woodruff key and is secured by a washer and J/2"-13
thd, cap screw. A rectifier with six diodes is mounted on the exciter rotor and
converts exciter AC ou~tput to DC for excitation 0 f the generotor revolvirrg fields.
The exciter DC output to t-he generator fields, and consequently the generator
output,
is controlled by the amount of DC voftcge supplied to exciter fields by
the static
voffage
regu!ator. A centrifugal, radial-blade fan which is par: ,_
of the hub and coupling assembly, draws cooling air over c!l internal wirdiags.
Air enters at the exciter end and is dischcrgrd at the drive end. The complete
generator is bolted to the engine flywheel ,housing.
E. Control Box Assembly
The control box (Fig. 8) is a shect.metal enclosure which houses and provides
mounting facilities for generator and engine controls and monitoring equipment.
The box is equipped with two,
drawer type trays which contain generator output
control devices and monitoring instruments. Troys slide in and cut on nylon rollers
for easy access to internally mounted components. Each tray is ecsily remcvable
by disconnecting
an "Amphenol" connector, unlocking safety latches, and sliding
the complete tray assembly out of the control box.
A
shielded, instrument panel light is mounted on the left side of the control
box front pcnel, to illuminate controls and instruments in the trays.
(1) Generator control tray (See Figure 9)
The generator control tray contains instruments and controls for monitoring
and controlling the generator output.
(a) Res iston
Two, JO-ohm, loo-watt, ballast resistors (2) are connected in series
in the generator exe iter DC fie Id c ircuit.
Au g 25 I85
A variable resistor (1) is connected in series between the manual control
rectifier (14) and rheostut (13). Its purpose is to adjust the DC voltage
to the rheostat and thus determine the voltage range through which the
--heostat can controt generator output voltage.
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