Hobart 60PL20, Operation And Maintenance Manual

Page: 96 / 178

TROUBLE, SYMPTOM TEST, CHECK, AND/OR
AND CONDITION PROBABLE CAUSE REMEDY
PROTECTIVE CIRCUIT (CONTINUED)
2. Load contactor A. An undervoltage con- A. Observe generator voltage on
opens during power dition caused the voltmeter and adjust to normal
delivery. Under- over-undervoltage 115 V AC with voltage
voltage indicating sensing module (K26) regulator potentiometer (27,
light ON. to function normally. Fig. 1). Resume normal oper-
ation. If the load contactor
opens again and an under-
voltage condition is indi-
cated by UV indicating
light, proceed to step B.
B. Defective over-under- B. Use potentiometer (27, Fig.
voltage module (K26) 1) to reduce voltage to 104
V. The undervoltage indi-
cating light should NOT come
on 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).
C. Defective protective C. With unit running normally,
monitor module (K14) use potentiometer (27, Fig.
1) to reduce voltage quickly
to 90 V. If the undervoltage
indicating light (DS38) is
turned ON immediately, the
protective monitor circuitry
is defective. Replace
protective monitor (K14).
3. Load contactor opens A. Electric governor A. Proceed as follows:
during power delivery. improperly adjusted,
Overfrequency indicating or malfunctioning
light (DS40) ON
(1) Governor improp- (1) Adjust in accordance with
erly adjusted Sect. 2-3, Para. 3, E, (3).
(2) Electric governor (2) Check and adjust or re-
system malfunc- pair in accordance with
tioning 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 overfrequency con-
dition does not exist, replace the
toverunder frequency module (K27).
OM-2053
3-1 December 31/91 Revised
Page 18