Hobart 60PL20 Operation And Maintenance Manual page 91

TROUBLE, SYMPTOM
AND CONDITION
ENGINE AND CONTROLS (CONTINUED)
12. Engine lacks power
GENERATOR EXCITATION CIRCUITS
1. No (or low) gen-
erator output volt-
age in all phases.
Generator operating
at 400 Hz.
December 31/91 Revised
PROBABLE CAUSE
A. Improper engine
adjustments and gear
train timing
B. Insufficient fuel
C. Insufficient inlet
air due to damaged
air cleaner
D. Restricted exhaust
system
A. Defective generator
or excitation
circuit.
B. Defect in VOLTAGE
REG. excitation cir-
cuit.
(1) Defective REGU-
LATED/DIAGNOSTIC
switch (25,
Fig. 1)
(2) Defective exci-
tation-deenergi-
zation relay
(K16) (1-1; 1,
Fig. 7)
TEST, CHECK, AND/OR
REMEDY
A. "Tune-up" the engine in
accordance with Perkins Diesel
Handbook
B. See ENGINE, Trouble 3.
C. Check air cleaner for
"plugging" and/or damage.
D. Check exhaust pipes for
restrictions. Check muffler
for clogged condition.
Replace as required.
A. Place the REGULATED/
DIAGNOSTIC switch (25,Fig.1) in
DIAGNOSTIC position. This
applies 12-V DC from the
battery to the exciter
field, which should produce
an indicated output voltage
of 55 V-DC +/-5 V-DC. If the
voltage produced is within
this range, the generator is
good, and the trouble is in
the voltage regulator
circuit. Proceed to step B.
B. Check as follows:
(1) Check the switch thor-
oughly. A defective
switch may prevent cur-
rent reaching and/or
leaving the voltage reg-
ulator. Replace switch
if defective.
(2) Check EDR contacts. A
faulty EDR can prevent
power from reaching the
voltage regulator. Re-
place relay if defective
OM-2053
3-1
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