Hobart 5359D Operation And Maintenance Manual page 47

OM 2012
The swi>ch connccis 12-V DC p3wcr to the et?l;'in.- 0 cc~trcl sptem and to
the g~neratc.~ 1 2-V LX
c0nfiOi
system when tlx engine is funning.
(d) liourmztter
The hwrmetcr (6) is electrically driven from the 12-V DC bgi+ery sFtcm.
The hourmzter n-eo;ures and reca.Q engine rur!ning line rind wili rcccrd
up to ?9?9.9 hours on five revolving drums. The hourmzief operates o:ily
when the engine is running and the oil pressure switch (II) is closed.
(2) Engine and generator controls
(a) Fuse
A IO-amperefuse (15) protects the 12-V DC engine control circuit, hour-
meter, illuminating fight circuit, and 12-V DC system
in
the main gen-
erator protective system.
(b) Engine-generator control switch
,
Aug
2545
The engine-generator control switch (5) ( aiso identified as the "build-up-
voltage, generate, idle" switch) is a three-position toggle type. It is
spring-loaded in one position, BUILD-UP-VOLTAGE, and will auto-
matically reposition to GENERATE position when released. In BUILD-
UP-VOLTS position it perform a dual function. First, it supplies power
to the governor control box, which allow the engine to operate at
norma I governed speed; set ond , it momentarily supplies current for
clcsing the excitation-deenergization relay (3, Fig. 9) contacts, to make
three-phase, 115-V AC power available to the voltage regulator, or to
the manual voltage control circuit for excitation of the generator exciter.
In GENERATE pcsition, power is maintained to the governs control box
and to the excitation relay (3, Fig. 9). When the switch is placed in
IDLE position, power is disconnected so that the engine returns to idle
speed and the exciter fie'ld is deenergized,
1-i
Page 23