Graco Inc. 244592 - Manual (Page 29)

Electrical Tests
309298J 29
Electrical Tests
Electrical components inside the gun affect performance
and safety. The following procedures test the condition
of the power supply (12) and barrel (6), and electrical
continuity between components.
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. Measure resistance between the electrode needle
tip (40a) and the turbine air inlet fitting (TA); it should
be 156-180 megohms. If outside this range, relieve
pressure and remove the air cap (page 37). Inspect
the electrode (40a) and the barrel conductive ring
(6a) for damage and proper position, to ensure that
the electrode makes contact with the conductive
ring. Reinstall the air cap and repeat the measure-
ment. If it is still outside this range, remove the gun
for service.
Fig. 19. Test Gun Resistance
CAUTION
The barrel resistor cartridge is part of the barrel and
is not replaceable. To avoid destroying the gun barrel,
do not attempt to remove the barrel resistor.
WARNING
Fire, Explosion, and Electric Shock Hazard
Megohmmeter Part No. 241079 (AA-see
F
IG . 19.) is not approved for use in a haz-
ardous area. To reduce the risk of sparking,
do not use the megohmmeter to check elec-
trical grounding unless:
•The gun has been removed from the haz-
ardous 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.
TI1733B
TI1739A
AA
40a
TA
TA