Electrical Tests; Test Gun Resistance - Graco Pro Xp 3A2494D Instructions Manual

Electrical Tests

Tests
Electrical Electrical Tests
Use the following procedures to test the condition
of the power supply and gun body, and electrical
continuity between components.
Use megohmmeter Part No. 241079 (AA) and an
applied voltage of 500 V. Connect the leads as
shown.
Megohmmeter Part No. 241079 (AA-see Fig.
17) 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.
3A2494D
Test Gun Gun Resistance Resistance
Test Test Gun Resistance
1. Flush and dry the fluid passage.
2. For For For Model Model L40T14 Model L40T14 and L40T14
the barrel continuity to verify that the metal pin
in the barrel is properly grounded. Measure
resistance between the metal pin (GP) and the
air swivel (21). The resistance should be less
than 100 ohms. If the resistance is 100 ohms or
more, replace the gun body.
3. For For all all all guns: For guns: Trigger the gun and measure guns:
resistance between the electrode needle tip (3)
and the air swivel (21). The resistance should be:
• 75–120 megohms for 40kV guns
• 104–148 megohms for 60kV guns
• 148–193 megohms for 85kV guns
If outside this range, test the gun
untriggered. If still outside this range, go to
Test Power Supply Resistance, page
see Electrical Troubleshooting, page 35
possible causes of poor performance.
Figure 17 Test Gun Resistance
Electrical Tests
and L40T15 and L40T15 guns L40T15 guns only: guns only: Test only:
32. If in range,
for other
31