Hobart 60PL20 Operation And Maintenance Manual page 92

OM-2053
TROUBLE, SYMPTOM
AND CONDITION
GENERATOR EXCITATION CIRCUITS
1. No (or low) gen-
erator output volt-
age in all phases.
Generator operating
at 400 Hz. (continued)
3-1
Page 14
PROBABLE CAUSE
(3) Defective ballast
resistor, (See
1-1; 16, Fig. 7)
(4) Defective
connector at
voltage regu-
lator, or defec-
tive wiring from
regulator to
exciter field.
(5) Defective voltage
regulator
TEST, CHECK, AND/OR
REMEDY
(3) If output voltage was
produced when the gener-
ator set was operated in
DIAGNOSTIC mode, the
resistor is good. If no
voltage was produced in
DIAGNOSTIC mode, the
resistor could be defec-
tive. Connect a jumper
lead across the ballast
resistor. If an output
voltage is now produced,
replace resistor as
required.
(4) Disconnect plug from
voltage regulator PC
board. Using jumper
leads with clip and prod
terminals, connect 12-V
DC to terminals 4 and 5
in loose plug. Connect
NEGATIVE to terminal 5
Connect POSITIVE lead to
terminal 4 (see Sche-
matic/Connection Diagram
in Chapter 6). If the
generator will NOT pro-
duce at least 50 V-AC,
replace or repair
connector and wiring
between voltage regula-
tor and exciter field as
required.
(5) All components in the
excitation circuit ex-
cept the voltage regula-
tor have been tested in
steps (1) through (4)
above. This leaves only
the regulator as a cause
of trouble. Replace
voltage regulator PC
board.
December 31/91 Revised