Generac Power Systems 5415, 5412, 5411 Test 11 - Check Main Circuit Breaker, 11. - Rotor Assembly

Section 7

DIAGNOSTIC TESTS

POSITIVE (+)

TEST LEAD

Figure 7-11. – Rotor Assembly

Test 11 – Check Main Circuit Breaker

DISCUSSION:

The main circuit breaker on the generator panel must be closed or no output to the load will be available. A defective breaker may not be able to pass current even though it is in the “ON” position.

			CB1
SCHEMATIC	CB2
RED	BLACk	11	33
PICTORIAL

Figure 7-12. – Main Breaker (Typical)

PROCEDURE:

Set the coach main breaker to it’s “OFF” position. Check that the appropriate main breaker on the gen- erator panel is set to its “ON” (closed) position. Set a VOM to measure resistance and use it to check for continuity across the breaker terminals.

RESULTS:

1.If breaker is “ON” and “Continuity” is measured, go to Test 3.

2.If breaker is “OFF”, reset to the “ON” position and check for AC output.

3.If breaker is “ON” and “Continuity” is not mea- sured, replace the defective circuit breaker.

Test 12 – Check Load Voltage &

Frequency

DISCUSSION:

If engine speed appears to drop off excessively when electrical loads are applied to the generator, the load voltage and frequency should be checked.

PROCEDURE:

Perform this test in the same manner as Test 1, but apply a load to the generator equal to its rated capac- ity. With load applied check voltage and frequency.

Frequency should not drop below about 60 Hertz with the load applied.

Voltage should not drop below about 120 VAC with load applied.

RESULTS:

1.If voltage and/or frequency drop excessively when the load is applied, go to Test 13.

2.If load voltage and frequency are within limits, end tests.

Test 13 – Check Load Watts &

Amperage

DISCUSSION:

This test will determine if the generator’s rated watt- age/amperage capacity has been exceeded.

Continuous electrical loading should not be greater than the unit’s rated capacity.

PROCEDURE:

Add up the wattages or amperages of all loads pow- ered by the generator at one time. If desired, a clamp- on ammeter may be used to measure current flow. See “Measuring Current” on Page 16.

RESULTS:

1.If the unit is overloaded, reduce the load.

2.If load is within limits, but frequency and voltage still drop excessively, complete Test 2, “Check Stepper Motor Control”. If stepper motor adjust- ment does not correct the problem, go to Problem 8 (Flow Chart, Pages 32 and 33).

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