Electrical Tests
22
333011D
Electrical Tests
Electrical components inside the gun affect performance
and safety. The following procedures test the condition
of the power supply (7) and electrode (25a), and electri-
cal 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 (25a) and the turbine air inlet fitting (TA); it
should be 148-193 megohms.
3. If outside this range go to
Test Power Supply
Resistance
, page 22. If in range, and there are per-
formance concerns, see
Electrical Troubleshoot-
ing
, page 27 for other possible causes of poor
performance.
Test Power Supply Resistance
1. Remove the power supply (7). See
Power Supply
Removal and Replacement
, page 33.
2. Remove the turbine (8) from the power supply. See
Turbine Removal and Replacement
, page 34.
3. Measure resistance from the power supply's ground
strips (EE) to the spring (7a). The resistance should
be 130–160 megohms for 85kV guns. See F
IGURE
18.
If outside this range, replace the power supply. If in
range, and there are performance concerns, go to
Test Barrel Resistance
, page 23.
4. Refer to
Electrical Troubleshooting
, page 27 for
other possible causes of poor performance.
5. Be sure the spring (7a) is in place before reinstalling
the power supply.
NOTICE
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.
Megohmmeter Part No. 241079 (AA-see F
IGURE
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.
F
IG
. 17 . Test Gun Resistance
F
IG
. 18 Test Power Supply Resistance
AA
25a
TA
TA
WLD
EE
7a
