Electrical Troubleshooting - Graco PRO 244572 Instructions-Parts List Manual

Electrical Troubleshooting

Problem
Poor wrap.
ES indicator or voltage/current dis-
play is not lit.
Voltage/current display stays red
(smart guns only).
Operator gets mild shock.
Operator gets shock from workpiece. Workpiece not grounded.
* ES indicator light is off when the gun is triggered.
309295L
Cause
ES ON/OFF valve OFF (0).*
Gun air pressure too low.
Atomizing air pressure too high.
Fluid velocity too high.
Incorrect distance from gun to part.
Poorly grounded parts.
Faulty gun resistance.
Low fluid resistivity.
Fluid leaks from the fluid needle (26)
packings and causes a short.
Faulty turbine alternator (19).
The KV HI-LO lever is on LO.
ES ON/OFF valve OFF (0).*
No power.
Gun too close to part.
Check fluid resistivity.
Dirty gun.
Operator not grounded or is near
ungrounded object.
Gun not grounded.
Troubleshooting
Solution
Turn ON (I).
Check air pressure to gun; minimum
40 psi (0.28 MPa, 2.8 bar) needed at
gun for full voltage.
Decrease.
Decrease fluid pressure or replace
worn tip.
Should be 8-12 in. (200-300 mm).
Resistance must be 1 megohm or
less. Clean workpiece hangers.
See "Test Gun Resistance" on page
18.
Check fluid resistivity. See page 14.
Clean the needle cavity. Replace the
fluid needle. See page 30.
Be sure the plug is in place on the
back of the turbine alternator hous-
ing. Remove and test the turbine
alternator. See page 33.
Check the lever position; replace if
needed.
Turn ON (I).
Repair/replace alternator turbine;
replace power supply. See page 32.
Should be 8-12 in. (200-300 mm).
See "Check Fluid Resistivity" on
page 14.
Clean. See Operation Manual.
See "Grounding" on page 12.
See "Check Electrical Grounding" on
page 13 and "Test Gun Resistance"
on page 18.
Resistance must be 1 megohm or
less. Clean workpiece hangers.
23