Poor Electrostatic Wrap Troubleshooting - Graco PRO 5500wb Instructions-Parts List Manual

Voltage Loss Troubleshooting (continued)
11. A dielectric breakdown is most likely in one of the
following three areas. Repair or replace the com-
ponent that is failing.
D
Fluid hose
Check for leakage or any bulges in the outer
jacket, which may indicate a pin-hole leak
through the PTFErlayer. Disconnect the fluid
hose from the gun, and look for signs of fluid
contamination on the outside of the PTFE
portion of the fluid tube.
Inspect the end of the hose connected to the
voltage block. Look for cuts or nicks.
Make sure the hose is properly stripped; see
Fig. 12, page 15, for hose stripping dimen-
sions. Restrip or replace the hose.

Poor Electrostatic Wrap Troubleshooting

Problem
The system is holding voltage but
there is poor electrostatic wrap on
the part being sprayed
28 308496
Troubleshooting
12. Before reassembling the gun, clean and dry the
13. Reconnect the fluid hose as instructed on page 15.
14. Check the gun voltage with the voltage probe and
Cause
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
electrostatic spray.
D
Fluid packings
Remove the packing assembly from the gun
as instructed on page 38, and look for signs of
fluid leakage or any blackened areas, which
would indicate arcing is occurring along the
packing rod.
D
Fluid hose connection joint to the spray gun
A breakdown at the fluid hose connection joint
would be caused by fluid leaking past the
o-ring seals on the end of the hose. Remove
the hose at the gun connection and look for
signs of fluid leakage along the PTFE tube.
gun fluid inlet tube (item 17 on page 50). Repack
the inner spacer of the fluid packing rod with
dielectric grease and reassemble the gun.
meter before filling the gun with fluid.
Solution
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.