Hobart 140GT17K, Operation And Maintenance Manual With Illustrated Parts List

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Trouble Shooting Chart (Sheet 17 of 20)
Figure 4
TROUBLE, SYMPTOM TEST, CHECK, AND/OR
AND CONDITION PROBABLE CAUSE REMEDY
PROTECTIVE CIRCUIT (CONTINUED)
2. Load contactor B. Defective over-under B. Use rheostat to reduce
opens during power voltage module (K26) voltage to 104 V. The
delivery. Under- undervoltage indicating
voltage indicating light should NOT come on
light ON (Cont’d) during a time delay of 4 to
12 seconds. If the light
comes on before a delay of 4
to 12 seconds, the under-
voltage relay is defective.
Replace the module (K26) or
the protective relay tray.
C. Defective protective C. With unit running normally,
monitor module (K14) use rheostat to reduce
voltage quickly to
90 V. If the undervoltage
indicating light (DS38) is
turned ON immediately, the
protective monitor circuitry
is defective. Replace pro
tective monitor (K14) or replace
protective relay tray.
3. Load contactor A. Electric governor A. Proceed as follows:
opens during power improperly adjusted,
delivery. Over- or malfunctioning
frequency ind
cating light (DS40)
(1) Governor improperly (1) Adjust in accordance
ON adjusted with Sect. 2-3, Para. 3.
(2) Electric governor (2) Check and adjust or re-
system malfunctioning pair in accordance with
ENGINE AND CONTROLS,
Troubles 8 and 9.
B. Defective over-under- B. If overfrequency nuisance
frequency sensing tripping continues after the
module (K27) governor system is proven to
be good, and an overfre-
quency condition does not
exist, replace the over-
OM-2029
September 30/89 Revised 3-1
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