Visual
Visual
Visual Checks
Checks
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
.
6.
Check that the voltage isolation system's
enclosure door is closed and that any safety
interlocks are engaged and working properly.
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
Tests
Tests
Tests
If you still have no voltage, separate the spray gun
and hose from the voltage isolation system and
check whether the gun and hose alone will hold
voltage with the following test.
1.
Flush the system with water and leave the lines
filled with water.
2.
Discharge the system voltage (see
Discharge and Grounding Procedure, page 33
).
3.
Follow the
Pressure Relief Procedure, page 33
.
4.
Disconnect the fluid hose from the voltage
isolation system.
Avoid allowing any water to leak out of the fluid
hose as that could cause a significant air gap in
the fluid column up to the gun electrode, which
can break the conductivity path and conceal a
potential failure area.
5.
Position the end of the hose as far as possible
away from any grounded surface. The end of
the hose must be at least 1 ft. (0.3 m) from any
ground. Make sure that no one is within 3 ft. (0.9
m) of the end of the hose.
6.
Turn the ES ON/OFF valve to ON and trigger
the gun just enough to turn on the air to the gun
but not the fluid. Measure the voltage at the gun
electrode with a voltage probe and meter.
7.
Discharge the system voltage by waiting 30
seconds and then touching the gun electrode
with a grounded rod.
8.
Check the meter reading:
• If the meter reading is 45 to 55 kV, the gun and
fluid hose are okay, and the problem is in the
voltage isolation system.
• If the meter reading is below 45 kV, the
problem is in the gun or fluid hose.
9.
Flush the fluid hose and gun with enough air to
dry out the fluid passages.
10. Turn the ES ON/OFF valve to ON and trigger the
gun. Measure the voltage at the gun electrode
with a voltage probe and meter.
• If the meter reading is 45-55 kV, the gun
power supply is okay, and there is probably a
dielectric breakdown somewhere in the fluid
hose or gun. Continue with step 11.
• If the meter reading is below 45 kV, do the
, to check the gun and
power supply resistance. If those tests show
the gun and power supply are okay, continue
with step 11.
42
3A7504A
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