Ransburg Evolver Water Applicator 78863-90, 78863-60 - Manual (Page 21)

17
Robot Waterbase Applicator - Operation
Fluid Flow Rate
Keep the fluid flow rate as low as possible, consis-
tent with the conveyer or robot arm speed. For an
isolated paint system, fluid flow is adjusted through
the robot PLC by varying the pilot pressure to a fluid
regulator within the paint equipment system. Fluid
pressures from the circulating system may be as high
as 250 psig.
Target Distance
The distance between the gun tip and the article
being painted should be between 10-14". Excessive
distance causes a waste of coating material and wrap
back (paint particles being deposited on the gun body
or the robot arm). At close distances, the voltage at
the tip of the gun will be reduced, which decreases
the charging effect of the gun.
Electrostatic Voltage
The maximum voltage limit for these spray guns is
100 kV. Some painting operations may require dif-
ferent voltage settings to obtain optimum transfer
efficiencies. If Faraday cage areas are predominant
on the item being painted, a lower voltage setting
would aid in coating these areas.
When not spraying, it is recomended to set back
voltage to 30-40 kV or off.
> Most paints and solvents are toxic to a cer-
tain degree and flammable or combustible. Use
them only in a well ventilated atmosphere. Use
protective equipment as required in the material
safety data sheet supplied with the paint, coat-
ing, or solvent.
W A R N I N G
!
> If a 0 kV command is sent to the MicroPak,
a feedback fault will occur.
NOTE
Sometimes, depending upon target carrier spac-
ing, higher setback voltages may be required. The
ramp-up time for the HP-404 cascade (0-100 kV) is
approximately 3 seconds. This may be slightly lon-
ger with waterbase applications due to the charge
capacity of the fluid system.
The MicroPak voltage ramp-down works at a rate of
33 kV/sec. However, in waterbase applications, this
may be longer.
AA-03-01.1