Electrical Troubleshooting - Graco PRO 5500hc Instructions Manual

Electrical Troubleshooting

PROBLEM
Poor wrap-around
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
The turbine air is not on.
The distance between the gun and
workpiece is incorrect.
The parts are poorly grounded.
Booth exhaust velocity is too high.
The atomizing air pressure is too high.
The fluid pressure is too high.
The fluid viscosity is not right for electros-
tatic spray.
The voltage output is too low.
The turbine alternator is not operating.
The gun resistance is faulty.
Fluid leaks from the fluid rod packing and
causes a short.
The turbine alternator is faulty.
The KV switch is stuck on low.
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 on the turbine air.
Adjust the spraying distance to 8 to 12
inches (203 to 305 mm).
Clean the workpiece hangers; check for
proper grounding on the conveyor or track.
Reduce the exhaust velocity within the
code limits.
Reduce the atomizing air pressure.
Reduce the fluid pressure.
Check with the supplier for proper fluid
viscosity for electrostatic spray.
Check the possible causes listed below.
Check the air supply to the gun.
Check the gun resistance; see page 26.
Clean the fluid rod cavity, replace the
packing; see page 31.
Be sure the plug is in place on the back of
the turbine alternator housing; remove
and test the turbine alternator; see
page 36.
Check the switch actuation; replace the
KV switch if necessary.
Be sure the floor and the operator are
properly grounded; see Ground the Sys-
tem, page 13.
See Check the Electrical Grounding,
page 14.
Clean the workpiece hangers; check for
proper grounding on the conveyor or
track.
Check the cables and connections;
replace the parts if they are damaged.
Turn on the turbine air.
See other causes under Problem – Poor
wrap-around, above.
Refer also to the Graco ES display mod-
ule manual 308–265.