ELECTRICAL TESTS

The performance of the spray gun is directly affected by the condition of the electrical components contained inside the gun. The electrical tests below can be used to determine the condition of the power supply (40) and the resistor stud (2) as well as the continuity of the electrical path between the components.

Use megohmmeter 218–979 (see ACCESSORIES) and an applied voltage of 500 volts to complete these electri- cal tests. Connect the leads as shown.

Remove the gun from the manifold and bracket, as instructed on page 18, before performing the electrical tests.

WARNING

To reduce the risk of sparking, which could cause fire, explosion, or electrostatic shock and result in serious bodily injury, do not use the megohmmeter in the hazardous area. Remove the gun from the hazardous area before testing it.

Test Gun Resistance (See Fig 11 )

Measure the resistance between the end of the electrode

(28)and the gun body (39). The resistance should be between 329 to 401 megohms. If the resistance is out- side the specified range, go to the next test. If the

resistance is correct, refer to the Electrical Troubleshooting Chart on page 15 for other possible causes of poor performance.

Test Power Supply Resistance (See Fig

12 )

Remove the power supply (40) from the gun body (39). See page 25.

Measure the resistance from the power supply’s ground contact point (EE) to the contact inside of the power sup- ply seal (40d) [the conductive rubber contact may be slightly recessed into the seal]. See Fig 12 .

The resistance should be 297 to 363 megohms. If the resistance is outside the specified range, the power sup- ply is defective and must be replaced. If the resistance of the power supply is correct, proceed to the next test.

If you still have problems, refer to the Electrical Troubleshooting Chart for other possible causes of poor performance, or contact the nearest authorized service agency.

KEY

 

A

Megohmmeter

A

28

Electrode

 

39

Gun Body

 

 

 

39

 

28

 

Fig 11

0440

 

KEY

 

 

A

Megohmmeter

 

 

EE

Ground Contact Point

A

40

Power Supply

 

 

 

40d

Seal

 

 

 

 

 

EE

 

40d

40

0441

 

 

Fig 12

16 ￿￿8￿￿8￿

Page 16
Image 16
Graco Inc 224-224, 4600SC, 308-084 Electrical Tests, Test Gun Resistance See Fig, Test Power Supply Resistance See Fig, 40d

308-084, 4600SC, 224-094, 235-894, 235893 specifications

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