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CHAPTER 8

TH-57B ELECTRICAL SYSTEM

8.1.

Identify the three sources of electrical power for the TH-57B.

Battery

Generator

External Power Unit

8.1.1.

State the power rating of the battery.

24 volt,17 ampere hour

8.1.2.

State the generator output.

Rated at 30 Volts, 150 amp

Regulated to 28 volts, 105 amp

8.1.2.1.

State the purpose of the voltage regulator used in the generator system.

Maintains constant generator voltage under varying loads.

8.1.2.2.

State the purpose of the overvoltage sensing relay.

Trips the generator reset relay, disconnecting the generator from the circuit, when line voltage reaches 31±1 volts.

8.1.3.

State the purpose of the reverse current relay.

1.

Connects generator to common BUS only when proper voltage is obtained

2.

Prevents current flow from the battery to the generator

3.

Disconnects the generator from the common BUS when voltage drops below a safe level

8.1.4.

Identify the component that allows the generator to function as a starter.

Starter relay

8.1.4.1.

State when the igniters receive power.

When the field control relay is actuated

8.1.5.

State the power requirements for an engine start when using external power.

28 vdc 400 amp

8.1.6.

Recall the circumstances necessary to illuminate the battery caution lights.

54oC ±3o BATTERY TEMP caution light illuminates

60oC ±3o BATTERY HOT caution light illuminates

8.1.7.

State the loadmeter and voltmeter indications that would signify a generator failure.

Load Meter 0  Voltmeter 22 to 24 volts

21

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