Protective Circuit
Trouble, Symptom
Test, Check, And/or
and Condition
Probable Cause
Remedy
Load contactor opens during
power delivery. Over voltage
indicating light ON.
b.
Defective over-under-
voltage PC board (K26)
(1-1; 6, Fig. 6)
Use course voltage adjusting
potentiometer (36, Fig. 2) to
reduce voltage to 110 V AC.
Observe voltmeter and gradually
increase voltage with
potentiometer. If sensing circuit
in over-under voltage PC board
(K26) functions to open load
contactor at any value less than
125-VAC, it is defective.
Replace over- under voltage PC
board.
2.
Load contactor opens during
power delivery. Under voltage
indicating light ON.
a.
An under voltage condition
has caused sensing circuit
in over-under- voltage PC
board (K26) to function
normally.
Observe generator voltage on
voltmeter and adjust to normal
115 V AC with voltage regulator
potentiometer (36, Fig. 2).
Resume normal operation. If
load contactor opens again and
an under voltage condition is
indicated by UV indicating light,
proceed to step B.
b.
Defective over-under-
voltage PC board (K26).
Use course voltage
potentiometer (36, Fig. 2) to
reduce voltage to 95-V. Under
voltage indicating light should
NOT come on during a time
delay of 4 to 12 seconds. If
light comes on before a delay of
4 to 12 seconds, under voltage
relay is defective. Replace
over-under voltage PC board
(K26).
c.
Defective memory and time
delay (protective monitor)
PC board (K14)(1-1; 4, Fig.
6).
With unit running normally, use
course voltage potentiometer
(36, Fig. 2) to reduce voltage
quickly to 90 V. If under voltage
indicating light (DS38) on
control panel is turned ON
immediately, memory and time
delay PC board is defective.
Replace PC board (K14).
3.
Load contactor opens during
power delivery. Over frequency
indicating light (DS40) ON.
a.
Electric governor
improperly adjusted, or
malfunctioning
Proceed as follows:
b.
Governor improperly
adjusted
Adjust in accordance with Sect.
2-3, Para. 3.
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
November 27/1997
Chapter 2-4
Page 21
Содержание 90CU24
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