Troubleshooting - Graco Pro Xp 60 WB Instructions Manual

Troubleshooting

Troubleshooting Troubleshooting
Installing and servicing this equipment requires
access to parts which may cause an electric shock
or other serious injury if the work is not performed
properly. Do not install or repair this equipment
unless you are trained and qualified.
Follow the Fluid Voltage Discharge and Grounding
Procedure, page 33 before checking or servicing
the system and whenever you are instructed to
discharge the voltage.
To reduce the risk of an injury, follow the
Pressure Relief Procedure, page
you are instructed to relieve the pressure.
Check all possible remedies in the Troubleshooting
Chart before disassembling the gun.
Voltage Voltage Loss Voltage Loss Troubleshooting Loss Troubleshooting Troubleshooting
Normal spraying voltage for a system using the
waterborne gun is 45-55 kV. The system voltage is
lower due to spraying current demands and voltage
isolation system losses.
A loss of spraying voltage can be caused by a
problem with the spray gun, fluid hose, or voltage
isolation system, since all of the system components
3A7504A
are electrically connected through the conductive,
waterborne fluid.
Before troubleshooting or servicing the voltage
isolation system itself, you need to determine which
component in the system is most likely causing a
problem. Possible causes include the following:
Spray Gun Spray Spray
• Fluid leakage
• Dielectric breakdown at the fluid hose connection
• Not enough air pressure for the alternator turbine
• Faulty power supply
• Excessive overspray on gun surfaces
• Fluid in the air passages
33, whenever
Waterborne Waterborne Fluid Waterborne
• Dielectric failure of the hose (pin-hole leak in the
• Air gap in the fluid column between the gun and the
Voltage Isolation
Voltage Voltage
• Fluid leakage
• Dirty interior
Gun Gun
or fluid packings
Fluid Hose Fluid Hose Hose
PTFE layer)
isolated fluid supply, causing a low voltage reading
on the isolation system voltage meter.
Isolation System System
Isolation System
Troubleshooting
41