Trouble Shooting Chart (Sheet 16 of 20)
Figure 4
TROUBLE, SYMPTOM
TEST, CHECK, AND/OR
AND CONDITION
PROBABLE CAUSE
REMEDY
PROTECTIVE CIRCUIT
NOTE: The protective relays and protective monitor are not completely functional until the load contactor
is CLOSED. Since it is not advisable to vary voltages for test purposes while delivering power to an
aircraft, the generator should be connected to a load bank for trouble shooting the protective circuits.
To avoid repetition, it will be assumed that the reset switch [(36), Fig. 1] has been pushed and the load
contactor has been closed beforecommencing each test.
1. Load contactor
A. The overvoltage con-
A. Press reset switch (36,
opens during power
dition may have been
Fig. 1) and resume power
delivery. Overvoltage
the result of a sudden
delivery. Observe voltmeter
indicating light ON
drop in the load,
(2, Fig. 1) to be certain
or possible tampering
voltage is normal 115 V AC.
with voltage regulator
Adjust to normal if necessary.
rheostat, and
If the load contactor
may have been a
is opened again and an over-
normal action.
voltage condition is indicated
by light (DS 37), proceed
to step B.
B. Defective over-under-
B. Use voltage adjusting rheostat
voltage sensing module
to reduce voltage
(K26)
to 110 V AC. Observe
voltmeter and gradually
increase voltage with rheostat.
If the over-under-
voltage sensing module (K26)
functions to open the load
contactor at any value less
than 134 V AC, it is defective.
Replace over-undervoltage
module or complete
protective relay tray.
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 rheostat.
light ON.
to function normally.
Resume normal operation.
If the load contactor
opens again and an undervoltage
condition is indi-
cated by light (DS38), proceed
OM-2029
3-1
September 30/89 Revised
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Summary of Contents for 140GT17K
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Page 128: ...Canopy Assembly Figure 2 OM 2029 4 3 September 30 89 Revised Page 4 ...
Page 130: ...Generator Set Without Canopy Figure 3 OM 2029 4 3 September 30 89 Revised Page 6 ...
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Page 134: ...Radiator and Cooling System Group Figure 4 OM 2029 4 3 September 30 89 Revised Page 10 ...
Page 136: ...Air Cleaner Assembly Figure 5 OM 2029 4 3 September 30 89 Revised Page 12 ...
Page 138: ...Electric Governor Kit Figure 6 OM 2029 4 3 September 30 89 Revised Page 14 ...
Page 140: ...Panel Engine Control Assembly Figure 7 OM 2029 4 3 September 30 89 Revised Page 16 ...
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Page 148: ...Power Module Panel Assembly Figure 10 OM 2029 4 3 September 30 89 Revised Page 24 ...
Page 150: ...Generator Group Figure 11 OM 2029 4 3 September 30 89 Revised Page 26 ...
Page 152: ...Fuel Line Assembly Figure 12 OM 2029 4 3 September 30 89 Revised Page 28 ...
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