CHAPTER 5 100 AMP REGULATOR CHECKER

TB 9-2920-225-34-1

CHAPTER 5

100 AMP REGULATOR CHECKER

5-1. Purpose. This checker is intended to provide

c. Advance the power supply voltage control

quick bench tests to determine the general condi-

and note the voltage when the regulator relay is

tion f the regulator. The checker is not intended

closed and the main circuit light comes on. This

to replace the authorized test stands which are

is the relay closing voltage.

necessary to determine the accurate operating

d. Advance the voltage to 20 volts. The field

condition of the regulator.

indicator light should come on if the regulator

switching transistors are functioning.

5-2. Construction. The regulator checker can be

e. Advance the voltage until the field light turns

locally fabricated using salvaged components. The

mini-ammeter is an optional feature and most any

off (maximum of 32 volts). The light should shut

meter can be used, provided it is shunted to give

off if the regulating and switching transistors are

midscale reading.

functioning correctly.

f. Adjust the power supply voltage to 28 volts,

5-3. Power Supply. The regulator checker is used

adjust the regulator voltage adjusting rheostat

in conjunction with a variableexternal power sup-

until the field indicator light turns off.

ply having the following characteristics:

g. If the regulator fails these checks, perform

a. Voltage range 0-32 volts DC minimum.

bench tests and repairs.

b. Current range must be at least 2 AMPS.

h. If the regulator passes these checks, perform

c. The output power must be well filtered.

final tests on the authorized test stand.

NOTE

5-5. Mini-Ammeter Operation. If the regulator

The 500 AMP test stands, external power

checker is equipped with the optional meter, the

supply is adequate if additional filtering

following additional data can be obtained.

is added.

a. Note the average regulator current draw

5-4. Operation.

from several regulators which are known to be in

good operating condition.

a. Connect the checker to the regulator to be

tested.

b. While performing the above, check if the

meter reading is higher than normal, check for

b. Connect power supply to the checker.

shorted components and circuit. If the reading is

CAUTION

lower than normal, check for open circuits and

Be sure proper polarity is maintained.

components.

5-1