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Troubleshooting
Voltage Loss Troubleshooting (continued)
7. 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.
8. Check the spray gun cover and barrel for accumu-
lated 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.
9. Inspect the entire system for any visible fluid
leakage and repair any fluid leaks that are found.
Pay special attention to the following areas:
D Packing area of the spray gun
D Fluid hose: check for leakage or any bulges in the
outer jacket, which may indicate an internal leak
D Internal voltage isolation system components
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. Relieve the pressure and discharge the system
voltage as instructed on page 16.
3. Disconnect the fluid hose from the voltage isolation
system.
NOTE: 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.
4. 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. (305 mm) from any
ground. Make sure that no one is within 3 ft. (914
mm) of the end of the hose.
5. 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.
6. Discharge the system voltage by waiting 30 se-
conds and then touching the gun electrode with a
grounded rod.
7. 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. See the voltage isolation
system manual for further troubleshooting
information.
If the reading is below 45 kV, the problem is in the
gun or fluid hose.
8. Flush the fluid hose and gun with enough air to dry
out the fluid passages.
9. 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.
10. If the meter reading is 55 to 60 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 reading is below 55 kV range, do the
electrical tests on page 28 to check the gun and
power supply resistance. If those tests show the
gun and power supply are okay, continue with step
11, page 24.