ARMY TM 9-6115-671-14
AIR FORCE TO 35C2-3-446-32
MARINE CORPS TM 09249A/09246A-14
5-57
5.10.5 Exciter Rotor .
a. Inspection.
(1)
Shut down generator set, paragraph 2.11.2. Allow generator to cool to ambient temperature.
(2)
Open BATTERY ACCESS door (Figure 1-2), and disconnect negative battery cable.
(3)
Remove rear housing panel. Refer to paragraph 4.7.5.
(4)
Remove end bell top cover and louvered covers. Refer to paragraph 5.10.2.
(5)
Visually inspect generator assembly for obvious damage. Check exciter leads for broken wires
and signs of chaffing.
b. Testing.
(1)
Perform inspection per paragraph 5.10.5.a.
(2)
Tag exciter rotor leads, and remove bolts (3, Figure 5-11), lockwashers (4), and leads from
rotating rectifier plate (5).
NOTE
It will be necessary to bar (turn) engine in order to position a specific area of the
rotating rectifier at one end of the end bell access holes. Use center bolt on
harmonic balancer. Refer to TM 9-2815-259-24.
(3)
Connect resistance bridge between two exciter rotor leads, and note resistance reading.
Continue this procedure until readings are noted for each combination of leads (i.e., 1 and 2, 1
and 3, and 2 and 3).
NOTE
Ambient temperature must be expressed in °C. To convert °C to °F, use °F = °C
x 9
5 + 32.
(a)
To determine the resistance values at current ambient temperature, use the following
formula:
R1 = R25 [1 + 0.00385 (T-25)]
Where:
R1 = Unknown resistance
R25 = Known resistance at 25° C (77° F)
T = Current ambient temperature
(b)
Example for exciter stator leads at 5° C (41° F):
R1 = 29.23 [1 + 0.00385 (5-25)]
R1 = 29.23 [1 + 0.00385 (-20)]
R1 = 29.23 [1 + (-0.077)]
R1 = 29.23 [0.923]
R1 = 26.98
15% ohms
