Graco 247937 Electrical Troubleshooting, Electric Shock Hazard, See Test Total Gun Resistance on

Electrical Troubleshooting

Electrical Troubleshooting

Electric Shock Hazard

Installing and servicing this equipment requires access to parts which may cause an electric shock or other serious injury if the work is not performed prop- erly. Do not install or repair this equipment unless you are trained and qualified.

NOTE: Check all possible remedies in the Troubleshoot- ing Chart before disassembling the gun.

Problem	Cause	Solution
Poor wrap.	ES ON/OFF valve OFF (0).*	Turn ON (I).
(In general, a Pro Xs Waterborne gun	Gun air pressure too low.	Check air pressure to gun; minimum
will have less wrap than a Pro Xs		40 psi (0.28 MPa, 2.8 bar) needed at
solventborne gun.)		gun for full voltage.
	Atomizing air pressure too high.	Decrease.
	Fluid pressure too high.	Decrease.
	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 Total Gun Resistance on
		page 23.
	Faulty turbine alternator.	Be sure the plug is in place on the
		back of the power supply housing.
		Remove and test the turbine alterna-
		tor. See page 33.
	The KV HI-LO lever is on LO.	Check the lever actuation; replace if
		needed.
ES indicator or voltage/current dis-	ES ON/OFF valve OFF (0).*	Turn ON (I).
play is not lit.
	No power.	Replace power supply. See page 32.
Voltage/current display stays red	Gun too close to part.	Should be 8-12 in. (200-300 mm).
(smart guns only).
	Dirty gun.	Clean. See Maintenance on page
		20.
Operator gets mild shock.	Operator not grounded or is near	See Grounding on page 14.
	ungrounded object.
	Gun not grounded.	See Check Electrical Grounding on
		page 15 and Test Total Gun Resis-
		tance on page 23.
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.

22 312900G