Electrical Troubleshooting - Graco PRO 5500wb Instructions-Parts List Manual

Electrical Troubleshooting

Problem
Voltage is still present at the gun
after following the Fluid Voltage
Discharge and Grounding Pro-
cedure
The operator gets a shock
The operator gets a shock when
touching the workpiece
No or low voltage output reading
on the gun ES (kV) display
module
Troubleshooting
Cause
Gun electrostatics (turbine air) are
not turned off.
Did not wait long enough for the volt-
age to discharge through the voltage
bleed resistor.
There is an air pocket in the fluid line
that leaves the fluid near the gun
isolated.
Voltage isolation system failed.
The operator is not properly grounded
or is near an ungrounded object.
The gun is not properly grounded.
The workpiece is not properly
grounded.
The fiber optic cable or connection is
damaged.
The turbine air is not on.
Solution
Turn off the gun electrostatics.
Wait a longer period of time before
touching the electrode with a
grounded rod. Check for possible
bleed resistor failure.
Determine the cause of the air pocket
and fix the problem. Purge the air out
of the fluid line.
See the isolation system manual for
service information.
Be sure the floor and the operator are
properly grounded; see Ground the
System, page 17.
See Check the Electrical Ground-
ing, page 18.
Clean the workpiece hangers; check
for proper grounding on the conveyor
or track
Check the cables and connections;
replace the parts if they are dam-
aged.
Turn on the turbine air.
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