Hobart 9OC24S Operation Manual page 242

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;MOTOR GENERATOR DIVISION
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HOBART BROTHERS COMPANY
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OPERATION, MAINTENANCE, AND OVERHAUL MANUAL, TM-240A
SELF-PROPELLED GENERATOR SET, SPEC. NO. 5381A
ROUBLE SYMPTOM,
AND CONDITION S PROBABLE CAUSE
TEST, CHECK, AND/OR REMEDY
PROTECTIVE CIRCUIT (CONTINUED)
2. (Continued) B. (Continued)
8. undervoltage relay is defective.
Replace the re lay (UV) or the
protective relay tray.
C. Defective protective C. See N OTE above. With unit
monitor (PM) (l-l, Fig. running normally, use rheostat
7, item 1) (46, Fig. 1) to reduce voltage
quickly to 90 V. If the under-
voltage indicating light (3R) is
turned ON immediately, the pro
tective monitor circuitry is
defective o Replace the protec-
tive monitor (PM) or replace the
protective relay tray.
3. Load contactor
A. E lectric governor im- A. Proceed as follows:
opens during
properly adjusted, or
power de I ivery. malfunctioning
Overfrequency
light ON a (1) Governor improperly
(1) Adjust in accordance with
adiusted
2-3, Para. 3, E, (4).
(2) Electric governor (2) Check and adjust or repair
system ma Ifunction ing in accordance with ENG INE
AND CONTROLS, Trouble
no. 8 in the Trouble Shoot-
ing Chart 0
B. If overfrequency nuisance trip-
B. Defective overfrequency
ping continues after the govemc
sensing relay (OF)
system was proven to be good,
and an overfrequency condition
does not exist, replace the over
frequency relay (1-l; 3, Fig.7)
or the protective relay tray.
4. Load contactor A. E lectric governor im- A e Proceed as follows:
opens during power properly adjusted, or
delivery. Under- malfunctioning
frequency light ON .
(1) Governor improperly
(1) Adjust in accordance with
adjusted
2-3, Para. 3, E, (4).
Trouble Shooting Chart (Sheet 16 of 19)
3-2
Figure 6
Ott 30/73
Page 26
Rev ised Fe b 22/78