Graco WB3000 Instructions - Parts Manual page 41

Visual Checks
First, check the system for any visible faults or errors
to help isolate whether the spray gun, fluid hose or
voltage isolation system has failed. A voltage probe
and meter, part no. 245277, is helpful for diagnosing
voltage problems and is required for some of the
troubleshooting tests that follow.
1. Check that all of the air and fluid tubes and hoses
are properly connected.
2. Check that the voltage isolation system valves
and controls are properly set for operation.
3. Check that the interior of the isolated enclosure
is clean.
4. Check that the spray gun and voltage isolation
system have sufficient air pressure.
5. Check that the gun ES ON/OFF valve is in the
ON position and that the gun ES indicator light
is on. If the ES indicator light is not on, remove
the spray gun for service and complete the
Electrical Tests, page
6. Check that the voltage isolation system's
enclosure door is closed and that any safety
interlocks are engaged and working properly.
3A2497C
36.
7. Make sure the voltage isolation system is in
the "isolate" mode, where it is isolating the fluid
voltage from ground.
8. To eliminate air gaps in the fluid column, spray
enough fluid to purge the air out between the
voltage isolation system and the spray gun. An
air gap in the fluid hose can break the electrical
continuity between the spray gun and the isolated
fluid supply and cause a low voltage reading on
a voltage meter connected to the isolated fluid
supply.
9. Check the spray gun cover and barrel for
accumulated overspray. Excessive overspray
can create a conductive path back to the
grounded gun handle. Install a new gun cover
and clean the exterior of the gun.
10. Inspect the entire system for any visible fluid
leakage and repair any fluid leaks that are found.
Pay special attention to the following areas:
• Packing area of the spray gun.
• Fluid hose: check for leakage or any bulges in
the outer cover, which may indicate an internal
leak.
• Internal voltage isolation system components
Troubleshooting
41