Testing

Electrical System Component Repair
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After the generator has been assembled, you must test it for

proper performance.

a. Test setup with regulator removed. To check generator output without

regulation, remove the regulator from the generator. Connect two Jumpers between

terminals 1 and 5 and 2 and 3 of the connector as shown in A, Foldout 2. Install

the drive end housing on the generator. Connect the generator as shown in B,

Foldout 2. Operate the generator at the speeds indicated in C, Foldout 2. Then

adjust the variable resistor until the generator is producing the indicated voltage

at the rated amperage.

b. Test setup with regulator installed. Install the regulator in the

generator as directed. Connect the generator as shown in D, Foldout 2. The 0-to

100-ampere ammeter measures load current and the 0-to 50-volt voltmeter measures

generator output voltage.

Note. -The ignition switch must be closed at all times during tests.

This switch

completes the field coil circuit.

c. Heat run test. Operate the generator under the conditions given in C,

Foldout 2. Adjust the generator output voltage to 28 volts by removing the pipe

plug (A, 24, Foldout 1) and rotating the potentiometer adjusting screw. Operate

for 1 hour. Check that temperature rise does not exceed 280 F.

Note. - Perform this test at room temperature of 80 F.

d. Speed load test. Immediately after the heat. run test, operate the

generator at the speeds indicated in table C, Foldout 2. Generator output must be

at or above the indicated output.

e. Overspeed test. Disconnect the generator from the electrical circuit.

Then operate the generator at the speed and for the time interval specified in

table C, Foldout 2. Listen for any unusual noise that might indicate mechanical

failure.

OS 010, 2-P16