Electrical Tests. Graco 313227A PRO Xs Auto Waterborne Electrostatic Air Spray Gun

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Electrical Tests. Graco 313227A PRO Xs Auto Waterborne Electrostatic Air Spray Gun | Manualzz

Electrical Tests

Electrical Tests

Electrical components inside the gun affect performance and safety. The following procedures test the condition of the power supply (12), barrel (9) and external charging probe (2), and electrical continuity between components.

Use megohmmeter Part No. 241079 (AA) and an applied voltage of 500 V. Connect the leads as shown.

Test Total Gun Resistance

1.

Flush and dry the fluid passage.

2.

Measure resistance between the electrode needle tip (2) and the gun body (15) or the turbine air inlet fitting (TA); it should be 90-130 megohms. If outside

this range, remove the gun for service (page 28)

and go to the next test. If in range, refer to Electrical

Troubleshooting on page 27 for other possible

causes of poor performance.

Fire, Explosion, and Electric Shock Hazard

Megohmmeter Part No. 241079 (AA-see F IG . 16

through F IG . 20) is not approved for use in a hazard-

ous area. To reduce the risk of sparking, do not use the megohmmeter to check electrical grounding unless:

The gun has been removed from the hazardous area;

or all spraying devices in the hazardous area are turned off, ventilation fans in the hazardous area are operating, and there are no flammable vapors in the area (such as open solvent containers or fumes from spraying).

Failure to follow this warning could cause fire, explosion, and electric shock and result in serious injury and property damage.

AA

TA

TI1577A

TA

2

F IG . 16. Test Gun Resistance

TI13432a

22 313227A

Electrical Tests

Test Gun Resistance

Measure resistance between the turbine air inlet fitting

(TA) and the charging probe socket (CC) (see F IG . 17); it should be 70-95 megohms. If outside this range, check the power supply and barrel resistance. If in range, test the charging probe resistance.

Test Charging Probe Resistance

Measure resistance between the metal spring in the charging probe (DD) and the charging probe tip (BB)

(see F IG . 17); it should be 15-30 megohms. If outside this range, replace the charging probe. If in range, inspect the spring and barrel socket for possible causes of poor continuity. Reassemble the charging probe and retest the gun resistance.

AA

AA

TA

BB

F

IG

. 18. Test Charging Probe Resistance

DD ti13732

F IG . 17. Test Gun Resistance

CC ti13449a

313227A 23

Electrical Tests

Test Power Supply Resistance Test Barrel Resistance

1.

Remove the power supply (18), page 38.

2.

Remove the turbine alternator (19) from the power

supply, page 39.

3.

Measure resistance from the power supply's ground strips (EE) to the conductive contact in the center of

the power supply seal (FF). See F IG . 19

4.

The resistance should be 55-70 megohms. If outside this range, replace the power supply. If in range, proceed to the next test.

1.

Insert a conductive rod (GG) into the gun barrel

(removed for the power supply test) and against the metal contact (HH) in the front of the barrel.

2.

Measure the resistance between the conductive rod

(GG) and the charging probe socket (CC). See F IG .

20 The resistance should be 15-30 megohms.

3.

If the resistance is outside the range, replace barrel.

4.

If resistance is in range, reassemble the gun and test the gun resistance.

5.

If you still have problems, refer to Gun Repair on page 28 for other possible causes of poor perfor-

mance, or contact your Graco distributor.

AA

AA

FF EE ti1599a

F IG . 19. Test Power Supply Resistance

GG HH

CC

F

IG

. 20. Test Barrel Resistance ti12821

24 313227A

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