Figure 3-15. Voltage regulated adjustment (sheet 3 of 5).

TM 10-3930-242-34

1. CONNECT THE REGULATOR AS SHOWN ABOVE,

POLARIZE THE GENERATOR (FIG. 3-15 )

3. START THE UNIT AND OPERATE AT GOVERNED SPEED FOR 15 MINUTES. THE VOLTMETER

SHOULD INDICATE 28.2 V.

REMOVE THE REGULATOR COVER AND TURN THE ADJUSTING SCREW CLOCKWISE TO

INCREASE THE VOLTAGE SETTING AND COUNTERCLOCKWISE TO DECREASE THE SETTING.

5. AFTER EACH ADJUSTMENT, CYCLE THE GENERATOR BY REDUCING THE ENGINE SPEED AND

MOMENTARILY OPENING THE VOLTAGE REGULATOR POINTS BY HAND. THIS ELIMINATES

RESIDUAL MAGNETISM IN THE CORE OF THE REGULATOR AND ASSURESA TRUE ADJUSTMENT.

REPLACE THE REGULATOR COVER AND BRING UNIT SLOWLY UP TO OPERATING SPEED.

NOTE THE VOLTMETER INDICATION.

6. REPEAT STEPS 4 AND 5 UNTIL THE DESIRED VOLTAGE IS OBTAINED.

7. STOP THE UNIT.

ME3930-242-34/3-15

Figure 3-15. Voltage regulated adjustment (sheet 3 of 5).

high resistance in the internal connections. If

stall torque of 20 ft.-lbs. minimum. The stall tor-

que is the product of the spring scale reading in

the current is high and the speed is low, inspect

t h e bearing and armature for binding and in-

p o u n d s multiplied by the torque arm in feet. If

c o r r e c t alinement.

the current and torque are both low, inspect for

h i g h resistance in the internal connections and

( 2 ) Stall torgue test. With the starter con-

f o r improper brush contact. High current and

nected as in (1) above, fasten a torque arm and a

l o w torque may be caused by a defective arma-

s p r i n g scale to the armature at the drive end.

ture or field coil.

A d j u s t the rheostat to give 3.52 volts. The cor-

i. Installation. I n s t a l l t h e s t a r t e r ( T M

r e c t readings are 500 amperes maximum and a

10-3930-242-12).