Electrical Tests; Test Gun Resistance - Graco WB3000 Instructions - Parts Manual

Electrical Tests

Electrical Tests
Use the following procedures to test the condition
of the power supply and gun body, and electrical
continuity between components.
NOTICE
The gun body resistor cartridge is part of the body
and is not replaceable. To avoid destroying the gun
body, do not attempt to remove the body resistor.
Use megohmmeter Part No. 241079 (AA) with 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.
36

Test Gun Resistance

1. Flush and dry the fluid passage.
2. Measure resistance between the electrode
needle tip (25a) and the air swivel (21).
The resistance should be 104–150
megohms. If outside this range, go to
Test Power Supply Resistance, page
range, see Electrical Troubleshooting, page 45
other possible causes of poor performance, or
contact your Graco distributor.
Figure 17 Test Gun Resistance
37. If in
for
3A2497C