Section 7.2

ENGINE DC CONTROL SYSTEM / AC TROUBLESHOOTING

5.Momentarily jump Wire #15 (located at the fuse holder) to Wire #56 (located at the Starter Contactor). This will initiate cranking of the engine. The generator will start, but the throttle will need to be controlled manually. Hold the throttle at about a half load setting.

6.Set a VOM to measure AC. Measure the AC voltage at the tim- ing winding connector (orange and grey wires). The voltage should be between 15 and 20 VAC.

7.If results are lower, there is a possible stator problem. Proceed to Test 34.

TEST 34 -STATOR RESISTANCE VALUES

Refer to Part 1, Section 1.4 and 1.5 for test procedures.

AC1 to AC2

0.414 to 0.465 ohms

SL1 to SL2

0.414 to 0.465 ohms

#55 to #66

0.095 to .108 ohms

#55 to #77

0.095 to 0.108 ohms

TIM1 to TIM2

0.102 to 0.116 ohms

PS1 to PS2

0.206 to 0.227 ohms

TEST 35 - BRIDGE RECTIFIER TEST

1.Disconnect the Red-Black-Blue-Green DC Link wires from either the connection in the control panel or at the inverter. Isolate the DC Link wires.

2.Turn CB1 to the OFF position.

3.Disconnect the 3-pin connector at J4 on the A6060 circuit board.

4.Instal paper clips in connector to use as a test point.

5.Set a VOM to the DIODE test range.

6.Attach the negative test lead of the VOM to the Red Wire and the positive test lead to the Blue Wire.

7.The voltage measured across the Bridge Rectifier should be approximately 1.000 VDC. Any voltage reading higher or lower indicates a defective diode assembly. Disassemble the Bridge Rectifier and test each diode individually.

TEST 36 - AC POWER WINDING TEST

AC1/AC2/SL1/SL2

1.Turn CB1 to the OFF position.

2.Set a VOM to measure AC Volts.

3.Connect one test lead to the bottom Grey wire (AC1) on CB1. Connect the other test lead to the Yellow wire (AC2) located on the Bridge Rectifier.

4.Start the generator.

5.The measured AC voltage reading should be approximately 187 VAC.

6.Connect one test lead to the bottom Orange Wire (SL1) on CB1. Connect the other test lead to the Brown wire (SL2) locat- ed on the Bridge Rectifier.

7.Start the generator.

8.The measured AC voltage reading should be approximately 187 VAC.

9.If a lower voltage is measured, proceed to Test 34.

Page 7.2-19

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Generac Power Systems 941-2, 940-2 service manual Test 34 -STATOR Resistance Values, Test 35 Bridge Rectifier Test
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941-2, 940-2 specifications

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