volts. If the voltage drops when the

adjustable resistor.

Operate

full load is applied, turn the contact

under these conditions for 30

screw assembly (22) counterclockwise,

minutes.

apply a load of 100 amperes instan-

(4)

taneously, and check the voltage. If

the voltage rises when a full load is

rpm, turn the adjusting knob of the 5-

applied, turn the contact screw

ohm adjustable resistor assembly

assembly clockwise, apply a load 100

clockwise. Turn the contact screw

amperes instantaneously, and check

assembly (22, fig. 1) clockwise until a

the voltage. Repeat the procedure

stable voltage is reached. As the

until voltage remains at 28 ± 0.5 volts

screw is turned in, the voltage will rise,

under both battery ind full load

then drop, and then start to rise again.

conditions.

Proper point of adjustment is just

before the voltage starts to rise the

generator speed to 6,000 rpm and

second time. Vary the load from the

apply a load of 100 amperes

battery load to full load (100 amperes);

instantaneously.

After applying

voltage should remain about the same.

several loads of 100 amperes

instantaneously, the voltage should not

loosen screw (32). Adjust the voltage

rise or drop more than 0.5 volts. If the

regulator to 26.5 volts by turning the

voltage drops more than 0.5 volts, turn

coil core (35). If the voltage is high,

the contact screw assembly (22)

turn the coil core clockwise; if the

counterclockwise and apply a load of

voltage is low, turn the coil core

100 amperes instantaneously. Check

counterclockwise. Turn the adjusting

the voltage. If the voltage varies more

knob of the 5-ohm adjustable resistor

than 0.5 volts, turn the contact screw

assembly

from

its

completely

assembly clockwise and apply a load

counterclockwise position (minimum

of 100 amperes instantaneously.

resistance) to its completely clockwise

Repeat the procedure until the voltage

position (maximum resistance). The

remains at 28 ± 0.5 volts under both

voltage range should be from 25 to 30

battery and full load conditions.

volts. Tighten the screw to secure the

the

alternating

current

coil.

generator speed to 3,200 rpm and

apply a load of 100 amperes

instantaneously several times. With

battery load only, voltage should now

read 28 ± 0.2 volts.

(5)

2,600 rpm under a 100 ampere load.

Set the generator voltage to 28 volts

Reduce the alternator speed until

by means of the 5-ohm adjustable

regulator voltage is 26.4 to 26.6 volts,

resistor assembly. Apply a load of 100

and then measure the alternator field

amperes instantaneously and see that

current and carbon pile voltage. To

the voltage has remained constant.

measure the carbon pile voltage,

Increase the generator speed to 2,000

connect a voltmeter across B and C

rpm and apply a full load of 100

pins of the 5 cable receptacle

amperes.

The generator regulator

assembly. Divide the carbon pile

voltage should remain at 28 ±0.5