ARMY TM 9-6115-672-14
AIR FORCE TO 35C2-3-444-32
MARINE CORPS TM 09244A/09245A-14
5-55
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 9-2815-260-24.
(3)
Connect resistance bridge (ohmmeter) 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
(4)
Resistance readings should be as shown in Table 5-2 for each combination of leads. Readings
other than in Table 5-2 indicate open or shorted windings, and rotor assembly must be replaced.
Refer to paragraph 5.10.6.
(5)
Set multimeter for ohms, and connect between each exciter rotor lead and rotor shaft in turn.
(6)
Multimeter reading of less than infinity indicates defective ground insulation, and rotor assembly
must be replaced. Refer to paragraph 5.10.6.
(7)
Install exciter rotor leads, lockwashers (4), and bolts (3) on rotating rectifier plate (14).
(8)
Install end bell top cover and louvered covers. Refer to paragraph 5.10.2.
(9)
Install rear housing panel. Refer to paragraph 4.7.5.
(10) Connect negative battery cable to battery, and close BATTERY ACCESS door.
