Electrical Troubleshooting - Graco PRO AA5500SC Instruction Manual

Electrical Troubleshooting

PROBLEM
Reduced fluid efficiency
Operator gets shock
Operator gets shock when
touching workpiece
No or low voltage output reading
on gun display module
* Use the least air/fluid pressure needed for good results.
NOTE: If using an ES Display Module, see its instruction manual, No. 308265, for further troubleshooting.
Troubleshooting
CAUSE
Improper distance between gun and
work-piece
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 needle packing and
causes short
Faulty turbine alternator
kV 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 with gun fluid regulator*
Check supplier for proper fluid for electro-
static spray
Check fluid resistivity with paint meter and
probe
Check possible causes listed below
Check air supply to turbine inlet; See page 19
Check gun resistance; See page 28
Clean needle cavity; Replace fluid needle;
See page 37
Be sure plug is in place on back of turbine
alternator housing; Remove and test turbine
alternator; See page 39
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,
page 14
Clean workpiece hangers; Check for proper
ground on conveyor or track
Check cables and connections; replace if
damaged
See other causes under Problem - Reduced
fluid efficiency, above
308387 27