Hobart 9OC24S Operation Manual page 235

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HOBART BROTHERS COMPANY
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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, ~~-240~
SELF-PROPELLED GENERATOR SET, SPEC. NO. 538lA
TROUBLE, SYMPTOM
AND CONDTION S PROBABLE CAUSE TEST, CHECK, AND/OR REMEDY
GENERATOR AND EXCITATION CIRCUIT (CONTINUED)
1. (Continued) B. Defect in excitation circuit B. If the generator was proven to
be good in step "A" above , the
trouble must be in the excitation
circuit .
(1) Defective ballast re-
sistors (1RE S or 2RE S)
(1) With generator running at
governed speed, connect a
jumper lead across ballast
resistors (in generator control
tray) between terminals A and
B, Fig. 4. If a normal voltag
is now produced, check each
resistor, and replace defective
one (or both).
(2) Defective automatic-
manual sw.itch (IS)
(33, Fig. 1)
(2) With generator running at nor.
mal speed and automatic-
manual speed in AUTOMATIC
position, check voltage at
terminal Al5 and also at A16.
If no voltage at either of these
terminals, replace the auto-
matic-manual switch. If a
voltage can be read, proceed
to step (3).
(3) Defective voltage reg..
ulator (REG), or excita-
(3) With generator running, place
automatic.-manual switch (32,
tion-deenergization
Fig. I) in MANUAL position.
re lay (E DR)
If a normal voltage can be ob-
tained by adjusting the manual
control (31; Fig. l), the
trouble is confined to the volt
age regulator or excitation-
deenergization relay.
Ott 30/73
Iroutavs
3noormg Lnarr (sneer 7 or EY)
Figure 6
3-2
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