Electrical Troubleshooting Chart - Graco PRO 224-094 Instructions Manual

ELECTRICAL TROUBLESHOOTING CHART

PROBLEM
Poor wrap-around
Operator gets shock
Operator gets shock
when touching workpiece
No or low voltage output
reading on gun display
module
CAUSE
Improper distance between gun
and workpiece
Parts poorly grounded
High booth exhaust velocity
Atomizing air pressure too high
Fluid pressure too high
Improper fluid viscosity
Fluid resistivity too low
No or low voltage output
Turbine alternator not operating
Faulty gun resistance
Fluid leaks from fluid rod packing
and causes short
Faulty turbine alternator
KV HI-LO switch stuck on low
Operator not properly grounded
or is near an ungrounded object
Gun not properly grounded
Workpiece not properly
grounded
Damaged fiber optic cable or
connection
SOLUTION
Adjust spraying distance to
8 to 12 inches (203 to 305 mm).
Clean hangers, check for proper
ground on conveyer or track.
Reduce exhaust velocity within
code limits.
Reduce atomizing air pressure.
Reduce fluid pressure.
Check supplier for proper fluid for
electrostatic spray.
Check fluid resistivity with paint
meter and probe.
Check possible causes listed below.
Check air supply to gun.
Check gun resistance. See page 16.
Clean fluid rod cavity, replace packing.
See page 23.
Be sure plug is in place on back of
turbine alternator housing. Remove
and test turbine alternator. See page 25.
Check switch actuation; replace if
needed.
Be sure floor is properly grounded.
Wear shoes with conductive soles
or wear personal grounding straps.
Be sure operator is not in contact
with or carrying any metallic items
which could build up electrical charge.
See Check the Electrical Grounding.
Clean workpiece hangers. Check for
proper ground on conveyor or track.
Check cables and connections.
Replace if damaged.
See other causes under Problem –
"Poor wrap-around", above.