Electrical Tests. Graco 333012C - Pro Xp Auto Waterborne Air Spray Gun

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Electrical Tests. Graco 333012C - Pro Xp Auto Waterborne Air Spray Gun | Manualzz

Electrical Tests

Electrical Tests

Use the following procedures to test the condition of the power supply and gun body, and electrical continuity

between components. See Power Supply Removal

and Replacement, page 47.

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

Test Gun Resistance

1.

Flush and dry the fluid passage.

2.

Trigger the gun and measure resistance between the electrode needle tip (3) and the turbine air fitting.

The resistance should be 90-120 megohms. If out-

side this range, go to Test Power Supply Resis-

tance, page 32. If in range, and there are other

performance concerns, see Voltage Loss Trouble-

shooting, page 34 for other possible causes of poor

performance.

Megohmmeter Part No. 241079 (AA-see F IGURE 21)

is not approved for use in a hazardous 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

3

TA

WLD

TA

F IG . 21 . Test Gun Resistance

333012C 31

Electrical Tests

Test Power Supply Resistance

1.

Remove the power supply (7), page 47.

2.

Remove the turbine alternator (8) from the power

supply, page 48.

3.

Measure resistance from the power supply's ground strips (EE) to the spring (7a). See F IGURE 22.

4.

The resistance should be 90-115 megohms. If outside this range, replace the power supply. If in range, proceed to the next test.

5.

Refer to Electrical Troubleshooting on page 39 for

other possible causes of poor performance.

6.

Be sure the spring (7a) is in place before reinstalling the power supply.

Test Electrode Resistance

Remove the electrode (3). See Electrode Replace-

ment, page 43. Measure the resistance between the

contact (HH) and the electrode wire (GG). The resistance should be 8-30 megohms. If out of range, replace the electrode.

NOTE: If the gun resistance is still out of range after testing the power supply and electrode:

• Check that the conductive o-ring (4a) is making contact with the barrel pin.

• Check that the power supply spring (7a) is making contact with the barrel pin.

7a EE

F IG . 22 . Test Power Supply Resistance

F

IG

. 23 . Test Electrode Resistance ti1513a

F IG . 24 Nozzle Conductive O-Ring

4a

32 333012C

Electrical Tests

Test Ground Strip Resistance

Using an ohmmeter, measure the resistance between the latch housing (206) and the ground lug (214). The ground strip is grounded through the cart back to the ground lug. Resistance must be less than 100 ohms. If greater than 100 ohms, replace the ground strip (240).

Test Cylinder Resistance

Remove the enclosure door. Using an ohmmeter, measure the resistance from the pump (209) to the ground lug (214). Resistance must be less than 100 ohms. If greater than 100 ohms, replace the grounding cylinder

(227).

206

F IG . 25 . Test Electrode Resistance

214

F IG . 26 Test Cylinder Resistance

333012C 33

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