Graco PRO Xs4 AA manual Electrical Troubleshooting

Troubleshooting

Electrical Troubleshooting

Problem	Cause	Solution
Poor wrap.	ES ON/OFF valve OFF (0).*	Turn ON (I).
	Gun air pressure too low.	Check air pressure to gun; minimum
		40 psi (0.28 MPa, 2.8 bar) needed at
		gun for full voltage.
	Atomizing air pressure too high.	Decrease.
	Fluid velocity too high.	Decrease fluid pressure or replace
		worn tip.
	Incorrect distance from gun to part.	Should be 8-12 in. (200-300 mm).
	Poorly grounded parts.	Resistance must be 1 megohm or
		less. Clean workpiece hangers.
	Faulty gun resistance.	See “Test Gun Resistance” on page
		19.
	Low fluid resistivity.	Check fluid resistivity. See page 15.
	Fluid leaks from the fluid needle (26)	Clean the needle cavity. Replace the
	packings and causes a short.	fluid needle. See page 31.
	Faulty turbine alternator (19).	Be sure the plug is in place on the
		back of the turbine alternator hous-
		ing. Remove and test the turbine
		alternator. See page 34.
	The KV HI-LO lever is on LO.	Check the lever position; replace if
		needed.
ES indicator or voltage/current dis-	ES ON/OFF valve OFF (0).*	Turn ON (I).
play is not lit.
	No power.	Repair/replace alternator turbine;
		replace power supply. See page 33.
Voltage/current display stays red	Gun too close to part.	Should be 8-12 in. (200-300 mm).
(smart guns only).
	Check fluid resistivity.	See “Check Fluid Resistivity” on
		page 15.
	Dirty gun.	Clean. See Operation Manual.
Operator gets mild shock.	Operator not grounded or is near	See “Grounding” on page 13.
	ungrounded object.
	Gun not grounded.	See “Check Electrical Grounding” on
		page 14 and “Test Gun Resistance”
		on page 19.
Operator gets shock from workpiece.	Workpiece not grounded.	Resistance must be 1 megohm or
		less. Clean workpiece hangers.

* ES indicator light is off when the gun is triggered.

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