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307-712
FIRE OR EXPLOSION HAZARD
To
reduce
the risk of fire, explosion, or electric shock, which may result
from
electrical discharge, it is essential that:
S
All parts of the electrostatic system are properly grounded.
S
All personnel in or close to the spray area are properly grounded.
S All
electrically conductive objects or devices
in the spray area, includ
-
ing
paint containers, wash cans and tools, are properly grounded.
When
operating the electrostatic device, any ungrounded objects in the
spray
area (such as people, containers, tools, etc.) can become
electri
-
cally
charged. Arcing may occur if these objects then come in contact or
close to ground. Arcing of suf
ficient energy levels can ignite the fluid be
-
ing
sprayed, fumes from solvents,
dust particles, and other flammable
substances.
This can cause a fire or explosion and result in serious bod
-
ily
injury and property damage.
Static electricity can also be generated by the
flow of fluid through the
pump,
hose, gun, and nozzle, but it is dissipated through proper
ground
-
ing
as described in
Grounding
below
.
If
you
experience any arcing or feel even a slight shock,
ST
OP SPRA
Y-
ING
IMMEDIA
TELY
. Check for proper grounding of the entire system. Be
sure
you have corrected the problem before starting to spray again.
Grounding
The
following are
minimum
requirements for grounding a basic electro
-
static system. Your system may include other equipment or objects
which
must also be grounded. Always check your local electrical code for
detailed
grounding instructions. Be sure your system
is
connected to a
true
earth ground.
1.
Pump:
ground by using a ground wire and clamp as described in
your separate pump instruction manual.
2.
Air
compressors and hydraulic power supplies:
ground according to
the
manufacturer
’
s recommendations.
3.
Electrostatic
Spray Gun:
obtain grounding through connection to a
properly grounded air supply hose. Use only the Graco Electrically
Conductive
Air
Supply Hose; see
ACCESSORIES
section to order
.
Connect
the air hose ground wire to a true earth ground.
4.
Object being sprayed:
keep the work piece hangers clean and
grounded
at all
times. Contact points must be sharp points or knife
edges.
5.
All electrically conductive objects or devices
in the spray area,
including paint containers and wash cans, must be properly
grounded.
6.
All
persons entering the
spray area:
shoes must have conductive
soles,
such as leather
,
or personal grounding straps must be worn.
Rubber
or plastic soles are not conductive.
7.
The floor of the spray area
must be electrically conductive and
grounded. Do not cover the floor with cardboard or any
non-conductive material which would interrupt grounding
continuity.
8.
Flammable liquids
in the spray area must be kept in approved,
grounded
containers. Do not store more than the quantity needed
for
one shift.
9.
All solvent pails:
use only grounded metal pails, which are
conductive.
Do not place the pail on any non-conductive surface,
such as cardboard or paper, which would interrupt grounding
continuity.
10.
All
air and fluid lines and electric cables
must
be properly grounded.
Flushing and Cleaning Safety
To
reduce the risk of static sparking or splashing, always
follow the
Pres-
sure
Relief Procedure
on page 4.
Be sure the turbine air (electrostatics) is OFF before flushing or
cleaning
any part of the spray system.
Use
the lowest possible pressure to
flush. T
rigger the gun into a grounded
metal
waste container
.
To
flush or purge equipment,
ALWAYS use solvents with a flash point
equal
to or greater than that of the fluid being sprayed.
To
clean the exterior of the equipment,
ALWA
YS use solvents with a flash
point
of higher than 38
_ C
(100
_
F).
ALWAYS remove all solvent from the system before reactivating the
spray
gun.
Use
only non-sparking tools to clean residue from the booth and
hangers.
Ventilate
the Spray Booth
To
prevent hazardous concentrations
of toxic and/or flammable vapors,
spray
only in a properly ventilated spray booth.
NEVER
operate the spray gun unless the ventilating fans are operating.
Check
and follow all National, State and Local codes regarding air ex
-
haust velocity requirements. Check and follow all local safety and fire
codes
and OSHA standard 1910–107(b)(5)(i).
IMPORTANT
United States Government safety standards have been adopted under the Occupational
Safety and Health Act. These standards––particularly the
General Standards, Part 1910.107 and any other appropriate regulations––should be consulted in connection with the installation, operation, and
maintenance of electrostatic spray painting equipment.
HOW THE ELECTROSTATIC AIR SPRA
Y GUN WORKS
The
air hose supplies air to the spray gun. Part of the
air
operates
the
turbine and the rest of the air atomizes the
fluid
being sprayed. The turbine generates power
, which
is converted by the power cartridge, to supply high
voltage
current to the gun’
s ionizing electrode.
The
pump supplies fluid
to the hose and gun, where the
fluid is electrostatically charged as it passes the elec-
trode. The charged fluid is attracted to the grounded
workpiece, wrapping around and evenly coating all sur-
faces.