Graco Inc 3500WB, 308584, 222700 manual Electrical Troubleshooting, Problem, Cause, Solution, cedure

Troubleshooting

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

DFluid packings

Remove the packing assembly from the gun as instructed on page 33, and look for signs of fluid leakage or any blackened areas, which would indicate arcing is occurring along the packing rod.

DFluid hose connection joint to the spray gun

Check for leakage or any bulges in the outer jacket, which may indicate a pin-hole leak through the PTFE layer. 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. 4, page 12, for hose stripping dimensions. Restrip or replace the hose.

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.

12.Before reassembling the gun, clean and dry the gun fluid inlet tube (item 75 on page 46). Repack the inner spacer of the fluid packing rod with dielectric grease and reassemble the gun as instructed on page 34.

13.Reconnect the fluid hose as instructed on page 12.

14.Check the gun voltage with the voltage probe and meter before filling the gun with fluid.

Electrical Troubleshooting

Problem	Cause	Solution
Voltage is still present at the gun	Gun electrostatics (gun ES lever) are	Turn off the gun electrostatics.
after following the Fluid Voltage	not turned off.
Discharge and Grounding Pro-
cedure
	Did not wait long enough for the volt-	Wait a longer period of time before
	age to discharge through the voltage	touching the electrode with a
	bleed resistor.	grounded rod. Check for possible
		bleed resistor failure.
	There is an air pocket in the fluid line	Determine the cause of the air pocket
	that leaves the fluid near the gun	and fix the problem. Purge the air out
	isolated.	of the fluid line.
	Voltage isolation system failed.	See the isolation system manual for
		service information.
The operator gets a shock	The operator is not properly grounded	Be sure the floor and the operator are
	or is near an ungrounded object.	properly grounded; see Ground the
		System, page 14.
	The gun is not properly grounded.	See Check the Electrical Ground-
		ing, page 15.
The operator gets a shock when	The workpiece is not properly	Clean the workpiece hangers; check
touching the workpiece	grounded.	for proper grounding on the conveyor
		or track

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