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Generator and Controls (continued)
Trouble, Symptom and Condition
Probable Cause
Test, Check, and Remedy
5.
Load contactor opens as soon
as contactor close switch is
released from its top
(spring-loaded)
position
a. Defective contactor close
switch
(S408)
.
Connect a jumper lead between
terminals 1 and 2
(orange-red
and yellow-red wires)
on the
contactor close switch
(11, Fig.
2)
. If the load contactor now
remains closed, replace
contactor close switch.
b. Defective resistor R406
(located in back of control
panel, on right terminal strip
at bottom of panel. See
connection diagram
180435)
.
Using an ohmmeter, check
resistor R406 for proper
resistance
(7.5 ohms)
. If an
open circuit is indicated, replace
resistor.
c. Defective diode
(CR4O2)
.
This diode is also located on
the right terminal strip at bottom
rear of the control panel. Using
an ohmmeter, check this diode
for an open circuit. If diode is
defective, replace it.
d. Load contactor
(K402)
defective.
If no fault was found in steps
4-a, b, and c above, the load
contactor
(22, Fig. 1)
is
defective. Replace load
contactor.
6.
Load contactor opens during
power delivery.
a. Contactor opening could
have been normal because
of an overvoltage condition.
Resume operation and closely
observe voltmeter
(6, Fig. 2)
for
evidence of overvoltage.
If
contactor opens
when no
overvoltage condition exists,
proceed to Step b.
OM-2063 / Operation and Maintenance Manual
Jet-Ex 4D / Spec. 7003A-3 / Generator Sets
Dec 31/92
Chapter 2-2
Page 11
Содержание Jet-Ex 4D
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