ARMY
TM 5-6115-612-34
MARINE CORPS
TM 6115-34/8
AIR FORCE
TO 35C2-3-471-2
NAVY
AG-320BO-MME-OOO
4-2. GENERATOR ELECTRONIC CONTROL
MODULE. (cont)
b. Charger Voltage Test. (cont)
(4) Move RTD knob to position 1 for cold
temperature test. Voltmeter should indicate between
30.5-31.5 Vdc. Record voltmeter reading. Reset
GECM electronic logic by moving SOURCE switch to
BATT position and back to GEN position.
(5) Move RTD knob to position 3 for hot
temperature test. Voltmeter should indicate between
25.5-26.5 Vdc. Record voltmeter reading. Reset
GECM electronic logic by moving SOURCE switch to
BATT position and back to GEN position.
(6) Move RTD knob to position 4 for
shorted RTD test. Voltmeter should indicate less than
1 Vdc. Record voltmeter reading. Reset GECM
electronic logic by moving SOURCE switch to BATT
position and back to GEN position.
(7) Move RTD knob to position5 for open
RTD test. Voltmeter should indicate less than 1 Vdc.
Record voltmeter reading. Reset GECM electronic
logic by moving SOURCE switch to BATT position and
back to GEN position.
(8) Move RTD knob to position 2. Reset
GECM electronic logic by moving SOURCE switch to
BATT position and back to GEN position
(9) Decrease voltage from power supply
(± 0.5) Vdc. Voltmeter should indicate 26-28 Vdc.
Record voltmeter reading.
(10) Increase power supply No. 2 voltage
to 35 (± 0.5) Vdc.
Voltmeter should indicate
28.8-29.8Vdc. Record voltmeter reading.
(11) Any discrepancy noted during the
above procedure indicates a failure in the GECM
battery charging circuit. Refer to table 2-4,
Malfunction 15.
c.
Undervo
ltage Test.
(1) Perform test setup procedure
(paragraph 4-2). Reset GECM electronic logic by
moving SOURCE switch to BATT position and back to
GEN position
(2) Increase voltage from power supply
No. 2 until UNDER VOLTS light goes off. Voltage
should be 17-20 Vdc. Reset GECM electronic logic by
moving SOURCE switch to BAT position and back to
GEN position.
(3) Any discrepancy noted during the
above procedure indicates a failure in the GECM
undervoltage
circuit.
Refer
to
Table
2-4,
Malfunction 11.
d.
Overvoltage Test.
(1) Perform test setup procedure (para-
graph 4-2a). Reset GECM electronic logic by moving
SOURCE switch to BATT position and back to GEN
position.
(2) Increase voltage from power supply
No. 2 until OVER VOLTS light comes on. This voltage
should be between 35.5–39.0 Vdc. The test fixture
voltmeter reading will go to 0 when the OVER VOLTS
light goes on.
(3) Any discrepancy noted during the
above procedure indicates a failure in the GECM
overvoltage circuit. Refer to Table 2-4, Malfunction
12.
e.
Overtemperatu re Test.
(1) Perform test setup procedure
(paragraph 4-2a). Reset GECM electronic logic by
moving SOURCE switch to BATT position and back to
GEN position.
(2) Adjust power supply No. 2 to 28 (±
0.5) Vdc.
(3) Move OVER TEMP switch to
NORMAL position OVER TEMP light should come on.
(4) Move OVER TEMP switch to ON.
OVER TEMP light should go off.
(5) Any discrepancy noted during above
procedure indicates a failure in GECM temperature
monitoring circuit. Refer to table 2-4, Malfunction 13.
f.
Over
load Test.
(1) Perform test setup procedure
(paragraph 4-2a). Reset GECM electronic logic by
moving SOURCE switch to BATT position and back to
GEN position.
(2) Increase power supply No. 2 to 28
(+0.5) Vdc.
(3) Slowly increase voltage from power
supply No. 4 until OVER LOAD light comes on.
Voltage should be 53.75-58.75 millivolts.
(4) Decrease voltage from power supply
No. 4 to 22.3-23.7 millivolts. OVER LOAD light should
go out.
4-4
