TM 5-6115-332-14
P-8-614-14
TO 35C2-3-424-1
Table 5-1. DS and GS Troubleshooting (Cont ‘d)
Malfunction
Test or Inspection
Corrective Action
Step 2.
Test the generator as follows:
a. General. On-equipment electrical test procedure may provide a basis for determining the necessity and
extent of generator repair. The resistance values and tolerances contained in this paragraph should be used only
as a general guide. Take into consideration the test instrument used, test lead resistance. and the ambient tem-
perature at the time of the test. If more precise measurements are required, usc an instrument such as a Kelvin
Balance or a Whetstone Bridge and make comparative measurements between the suspected component
and a
like item that is known to be good.
b. Stator.
(1) Disconnect the plug connector (P1) at the rear of the control box.
(2) Use a multimeter that has been set on the RX1 scale and test for continuity between plug pins A and B,
D and E, and C and F. If continuity is not indicated (full deflection) on any of the tests, remove the plug at the
generator and repeat the tests at the generator. If, again, continuity is not shown, the stator is defective and must
be replace.
c. Rotor.
(1) Remove the blower cover and fan (para. 6-2 or 6-3).
(2) Use a multimeter that has been set on the RX1 scale and test between the rotor field windings terminal
and the case of the rotor. If the resistance is not within five percent above or below the following values, the rotor
must be removed for further testing (TM 5-764):
Model MEP-017A (60 Hertz)
8.8 o h m
s
Model MEP-022A (400 Hertz)
0.615 ohms
d. Exciter Field Windings.
(1) Disconnect the plug connector (P1) at the rear of the control box.
(2) Use Multimeter that has been set on the RX1 scale and tcst for continuity between plug pins G and H. If
the resistance is not within five percent above or below
54-4 ohms, the windings are defective and must be re-
placed. Refer to para. 7-14.
3. GENERATOR FREQUENCY FLUCTUATES OR DROPS UNDER LOAD
Check frequency converter for breaks
or cracks.
C h e c k f o r b u r n e d , b r o k e n , o r w o r n w i r i n g T e s t t h e f r e q u e n c y
m e t e r w i t h a m u l t i m e t e r , r e f e r t o p a r a g r a p h 4 - 1 6 .
If the meter does not pass the tests and inspections given above, replace it. Refer to paragraph 7-2
for instructions.
4. AC VOLTMETER FAILS TO INDICATE VOLTAGE OR CURRENT INDICATOR METER FAILS
TO INDICATE CURRENT
Step 1.
Perform the following tests:
a. Tag and disconnect all output selector switch leads.
b. Use a multimeter set on the RX1 scale and test the switch for continuity as outlined in c through f. below.
c. Turn the switch to the “120/208v, 3 phase” position. In this position there should be continutiy indicated be-
tween terminals 7 and 8,9 and 10, 2 and 6, and 13 and 14 of the switch.
d. Turn the switch to the “120v, 3 phase” position. Continuity should be indicated between terminals 8 and 9.
2 and 4, 5 and 6, and 13 and 15.
e. Position the switch in the “120v, 1 phase” position. Continuity should he indicated between terminals 8 and
10, 2 and 4, 1 and 3, 5 and 6, and 11 and 13 of the switch.
f. Turn the switch to the 240v, 1 phase position. Continuity should be indicated between terminals 8 and 10, 2
and 6, 1 and 3, and 12 and 13 of the switch.
If the switch does not pass the test above, replace it. Refer to figure 5-1 for removal and installation.
If the switch passes the above test, go on to Step 2.
5-4
