21
[Electrostatic spray gun]
※
For part names, see pages 30 and 31.
Symptom
Cause
Countermeasure
Red lamp on
controller lights but
electrostatic spray
effect is not
sufficient.
Electric resistance of paint is not
appropriate.
Adjust the electric resistance of paint to
between 10 and 100M
Ω-cm at AC500V.
Gun tip is contaminated and
high-voltage current is leaked,
resulting in a gun tip voltage drop.
Wipe off paint with a cloth soaked with
paint thinner.
Many splashes of
paint
Paint is sprayed toward a too long
distance.
Spray at an appropriate distance (200mm
to 300mm).
Paint pressure or air pressure is too
high.
Reduce the pressure.
The product being coated is not
grounded.
Class D or better grounding is required
(see the Research Committee
’s Report
issued by the Japan Industrial Safety &
Health Association).
Sparks sometimes
come out of nozzle
during spraying
operation.
Damaged cascade
※
Replace cascade with a new one.
Warning buzzer on
the control unit
sounds.
A high-voltage current leaks through
moisture contained in the
compressed air.
Supply dry compressed air using an air
drier or the like.
Electric resistance of paint is too low.
Adjust the electric resistance of paint to
between 10 and 100M
Ω-cm at AC500V.
Contaminants on gun
Clean the gun.
Nozzle is heavily
clogged.
Material filter mesh size is too large.
Select a filter mesh suitable for the nozzle
to be used.
Poorly cleaned gun
Especially when using two-component
paint, thoroughly clean with exclusive
paint thinner.
Paint leaks through
the root of gun
extension.
Worn U-packing at needle shaft
Remove trigger and seat set and replace
needle set with a new one.
Paint leaks from air
outlet in nozzle or
its periphery.
Worn or damaged seat at gun tip
Replace seat set with a new one.
Nozzle is not a high pressure type.
Use type ENH nozzle, which has a black
resin part and a protrusion on seat.
Paint comes out of
the tip of nozzle
when gun is not
triggered.
Worn needle
Remove trigger and replace needle set
with a new one.
Seat is clogged with foreign matter.
Remove seat set and clean needle seat.
8
Troubleshooting
