Electrical
Electrical
Electrical Tests
Tests
Tests
Electrical components inside the gun affect
performance and safety. Use the following
procedures to test the condition of the power supply
and gun body, and electrical continuity between
components.
Power Supply Removal and Replacement, page 66
.
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.
25) 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.
Test
Test
Test Gun
Gun
Gun Resistance
Resistance
Resistance
1.
Follow the steps under
Prepare the Gun for Service, page 58
2.
Trigger the gun and measure resistance
between the electrode needle tip (3) and the
air swivel (21). The resistance should be
104–150 megohms (90–120 megohms for
Model L60M19). If outside this range, go to
Test Power Supply Resistance, page 48
If in range, see
Voltage Loss Troubleshooting, page 51
for other
possible causes of poor performance, or contact
your Graco distributor.
Figure 25 Test Gun Resistance
3A2496H
47
