Section 7

DIAGNOSTIC TESTS

 

 

 

TEST 4 RESULTS

 

 

 

 

A

B

C

D

E

F

G

 

 

 

 

 

 

 

 

VOLTAGE RESULTS

ABOVE

ABOVE

BELOW

ZERO OR

BELOW

BELOW

ABOVE

WIRE 2 & 6

60 VAC

60 VAC

60 VAC

RESIDUAL

60 VAC

60 VAC

60 VAC

EXCITATION WINDING

 

 

 

VOLTAGE

 

 

 

 

 

 

 

(5-12 VAC)

 

 

 

 

 

 

 

 

 

 

 

VOLTAGE RESULTS

ABOVE

BELOW

ABOVE

ZERO OR

BELOW

BELOW

ABOVE

WIRE 11 & 22

60 VAC

60 VAC

60 VAC

RESIDUAL

60 VAC

60 VAC

60 VAC

POWER WINDING

 

 

 

VOLTAGE

 

 

 

SENSE LEADS

 

 

 

(5-12 VAC)

 

 

 

 

 

 

 

 

 

 

 

ROTOR AMP DRAW

.85 A

.85 A

.85 A

ZERO

≥1.2 A

.85 A

ZERO

QP55

± 20%

± 20%

± 20%

CURRENT

 

± 20%

CURRENT

(MODEL 4702/4703)

 

 

 

DRAW

 

 

DRAW

 

 

 

 

 

 

 

 

ROTOR AMP DRAW

1.2 A

1.2 A

1.2 A

ZERO

≥1.5 A

1.2 A

ZERO

QP65

± 20%

± 20%

± 20%

CURRENT

 

± 20%

CURRENT

(MODEL 4704/4705)

 

 

 

DRAW

 

 

DRAW

 

 

 

 

 

 

 

 

ROTOR AMP DRAW

.87-.79 A

.87-.79 A

.87-.79 A

ZERO

≥1.2 A

.87-.79 A

ZERO

QP75

± 20%

± 20%

± 20%

CURRENT

 

± 20%

CURRENT

(MODEL 4706/4707)

 

 

 

DRAW

 

 

DRAW

 

 

 

 

 

 

 

 

(MATCH RESULTS WITH LETTER AND REFER TO FLOW CHART – Problem 2 on Pages 28 & 29)

PROCEDURE:

1.Disconnect Wire 4 from the Voltage Regulator (VR). (Third ter- minal from the top of VR).

2.Connect a jumper wire to Wire 4 and to the 12 volt fused battery positive supply Wire 15 (Wire 15 located at fuse (F1) holder).

3.Set the VOM to measure AC voltage.

4.Disconnect Wire 2 from the DPE breaker (CB3) and connect one test lead to that wire. Disconnect Wire 6 from the Voltage Regulator and connect the other test lead to that wire. Start the generator and measure the AC voltage. It should be above 60 volts. Record the results and stop the generator.

5.Re-connect Wire 2 to the DPE Circuit Breaker (CB3) and re- connect Wire 6 to the Voltage Regulator.

6.Disconnect Wire 11 from the Voltage Regulator (VR) and con- nect one test lead to that wire. Disconnect Wire 22 from the Voltage Regulator and connect the other test lead to that wire. Start the generator and measure the AC voltage. It should be above 60 volts. Record the results and stop the generator.

7.Re-connect Wire 11 and Wire 22 to the Voltage Regulator.

8.Remove the jumper wire between Wire 4 and 12 volt supply.

9.Set the VOM to measure DC amps.

10.Connect one test lead to the 12 volt fused battery supply Wire 15, and connect the other test lead to Wire 4 (should still be disconnected from the VR).

11.Start the generator. Measure the DC current. Record the rotor amp draw.

12.Stop the generator. Re-connect Wire 4 to the Voltage Regulator.

RESULTS:

Proceed to “TEST 4 RESULTS” (top of page 40). Match all results to corresponding column in the chart. The column letter refers to the Problem 4 flow charts on pages 28 and 29.

TEST 5- WIRE CONTINUITY

DISCUSSION:

The Voltage Regulator receives unregulated alternat- ing current from the Stator Excitation Winding via Wires 2, 6 and 2A. It also receives voltage sensing from the Stator AC Power Windings via Wires 11 and

22.The regulator rectifies the AC from the Excitation Winding and, based on the sensing signals, regulates that DC current flow to the Rotor. The rectified and regulated current flow is delivered to the Rotor Brushes via Wires 4 (+) and 0 (-). This test will verify the integrity of Wires 0 and 2A.

PROCEDURE:

1.Set a VOM to its “Rx1” scale.

2.Remove Wire 0 from the Voltage Regulator, fourth terminal from the top (identified by a negative (-) sign next to terminal).

3.Connect one test lead to Wire 0 and the other test lead to a clean frame ground. The meter should read continuity.

4.Disconnect Wire 2A from the Voltage Regulator, sixth terminal from the top. Disconnect the other end of this wire from the

Page 40

Page 41 Page 43
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Image 42
Generac Power Systems 55, 75, 65 Test 5- Wire Continuity, Set the VOM to measure AC voltage, Set a VOM to its Rx1 scale
Page 41 Page 43

65, 75, 55 specifications

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