Electrical Troubleshooting - Graco 236-030 Instructions-Parts List Manual

Electrical Troubleshooting

NOTE: Additional gun troubleshooting can be done on Gun Part No. 236–031 using the Remote Spraying Voltage Read-
out ( SVR ) . See Accessories to order the SVR.
PROBLEM
Poor wrap-around
*ES indicator light not on when gun is triggered.
CAUSE
KV HI-LO lever on low
*ES ON-OFF lever in OFF position
Improper distance between gun and
work-piece
Parts poorly grounded
High booth exhaust velocity
Atomizing air pressure too high
Fluid pressure too high
Improper fluid viscosity
Fluid resistivity too low
No or low voltage output
*Turbine alternator not operating
Faulty gun resistance
Fluid leaks from needle packing and
causes short
*Faulty turbine alternator
SOLUTION
Check lever position
Turn lever to ON
Adjust spraying distance to 8 to 12
inches (203 to 305 mm)
Clean hangers; Check for proper ground
on conveyer or track
Reduce exhaust velocity within code lim-
its
Reduce atomizing air pressure
Reduce fluid pressure
Check supplier for proper fluid for elec-
trostatic spray
Check fluid resistivity with paint meter
and probe
Check possible causes listed below
Check if ES ON-OFF lever is ON;
Check air supply to gun; Check for dirt
or moisture in turbine; See page 37
Check gun resistance; See page 26
Clean needle cavity; Replace fluid
needle; See page 35
Be sure plug is in place on back of tur-
bine alternator housing; Remove and
test turbine alternator; See page 37