Wire
Wire
Wire the
the
the Low
Low
Low Paint
Paint
Paint Digital
Digital
Digital Output
Output
Output
The Low Paint Digital output provides a means to
signal when the system is low on paint and when the
system has refilled. It is based on the user adjustable
"green on" and "red on" light tower settings. The
output is active when the red light is on and stays
active until the green light turns on. It remains
inactive until the reg light turns on again.
Prepare the electrical controls for service.
Follow the steps in
Prepare the Electrical Controls
.
The System Status Output uses an optocoupler
to protect the HydroShield controls from outside
voltages.
• Optocoupler ports A1+ and A2– are wired to the
control module.
• Optocoupler ports 13+ and 14 are wired to the
external device or PLC.
Function
Function
Function
A1+
A1+
A1+ (relative
(relative
(relative
to
to
to A2–)
A2–)
A2–)
PLC
PLC
PLC
Low Paint Output
Active
24 VDC
13+ and 14
connected
Low Paint Output
Inactive
Less than 13.5
VDC
13+ and 14
not connected
Check
Check
Check the
the
the Grounding
Grounding
Grounding of
of
of the
the
the Spray
Spray
Spray
Gun
Gun
Gun and
and
and Isolation
Isolation
Isolation System
System
System
Megohmmeter Part No. 241079 is not approved
for use in a hazardous location. To reduce the risk
of sparking, do not use the megohmmeter to check
electrical grounding unless:
• The gun has been removed from the hazardous
location;
• Or all spraying devices in the hazardous
location are turned off, ventilation fans in the
hazardous location are operating, and there are
no flammable vapors in the location (such as
open solvent containers or fumes from spraying).
Failure to follow this warning could cause fire,
explosion, and electric shock and result in serious
injury.
Graco Part No. 241079 Megohmmeter (AB) is
available as an accessory to check that the gun is
properly grounded.
1.
Have a qualified electrician check the electrical
grounding continuity of the spray gun and air
hose.
2.
Turn off the electrostatics.
3.
Turn off the air and fluid supply to the gun. Follow
the
Pressure Relief Procedure, page 30
. The
fluid hose must be empty.
4.
Purge the fluid hose with air, if needed.
5.
Follow the spray gun manual to check proper
grounding of the spray gun.
3A8492A
27
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