Section 7.2

ENGINE DC CONTROL SYSTEM / AC TROUBLESHOOTING

TEST 31 - STATIC TESTS ON INVERTER

ASSUMPTION:

Inverter not connected to generator.

Inverter has been disconnected for at least 5 min- utes from running genset to allow capacitors to dis- charge.

TEST PROCEDURE:

1.Set a DVOM to DIODE RANGE. Measure the 12 position con- nector on the inverter according to the chart below. Connect the negative and positive test leads as indicated in the chart.

2.Set a DVOM to RESISTANCE RANGE. Measure the 12 position connector on the inverter according to the chart below. Connect the negative and positive test leads as indicated in the chart.

STATOR TESTS

TEST 32 - POWER SUPPLY WINDING TEST

1.Disconnect the 12 position cable from the inverter.

2.Start the unit with CB1 in the OFF position.

3.Set a VOM to measure AC. Measure voltage across Pin #6 and Pin #7. The power supply voltage should be approximately 25-30 VAC at approximately 2700 rpm.

4.Turn CB1 to the ON position.

5.Voltage across the floating power supply should be approxi- mately 30 to 34VAC at approximately 3400rpm.

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

 

 

 

 

 

 

 

 

 

TEST 33 - TIMING WINDING TEST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Disconnect the timing winding from receptacle J5 on the A6060

 

 

 

 

 

 

 

 

 

 

circuit board (orange and grey wires).

 

 

 

 

 

 

 

 

2.

Disconnect the 12 position harness from the inverter.

 

 

 

 

 

 

 

 

3.

Two jumper wires with alligator clips are required.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.

Attach a jumper from Wire #15 (located at the fuse holder) to

 

 

Figure 11. 12 Position Connector on Inverter

 

 

Wire #14 (located at the four tab terminal block in the control

 

 

 

 

panel). This will enable fuel and ignition functions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Test With DVOM

 

 

 

 

 

 

 

 

 

Set At Diode Range

Connect negative lead to:

 

Connect positive lead to:

Reading should be:

 

 

 

 

 

 

 

 

 

 

 

Signal Circuit

 

Pin 2 (En/Com)

 

 

Pin 1 (PWM1)

1.25 to 1.5 v

 

 

 

 

 

 

 

 

 

 

 

Signal Circuit

 

Pin 2 (En/Com)

 

 

Pin 3 (PWM2)

1.25 to 1.5 v

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2. Test With DVOM

 

 

 

 

 

 

 

 

 

Set At Resistance Range

Connect negative lead to:

 

Connect positive lead to:

Reading should be:

 

 

 

 

 

 

 

 

 

 

 

Temperature Circuit

 

Pin 9 (0 V)

 

 

Pin 10 (TEMP)

*10 kOhm @ 25°C

 

 

 

 

 

 

 

 

 

 

 

±500 Ohms

 

 

 

 

 

 

 

 

 

 

 

Sense Circuit

 

Pin 9 (0 V)

 

 

Pin 11 (SENSE)

20 kOhm ± 200 Ohm

 

 

 

 

 

 

 

 

 

 

 

 

 

*NTC thermistor; if inverter is hot, resistance may be several kOhm lower. If inverter is cold, resistance may be several kOhm higher

 

3. Test With DVOM

 

 

 

 

 

Set At AC Volts

Connect negative lead to:

Connect positive lead to:

Reading should be:

 

 

 

 

 

 

 

 

Fan Test

Pin 9 (0 V)

Pin 4 (Wire #14)

See Note

 

 

 

 

 

 

 

NOTE: Use a ballpoint pen or small screwdriver to spin the blades of the inverter-cooling fan. Momentarily, observe a reading of 10 - 30 mV.

Page 7.2-18

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Generac Power Systems 940-2, 941-2 Test 31 Static Tests on Inverter, Stator Tests Test 32 Power Supply Winding Test

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