Ransburg RMA Direct A12867 - Manual (Page 56)

RMA-303 Direct Charge - Operation
53 LN-9266-11.3
TARGET DISTANCE
The distance between the RMA-303 atomizer
and the target will affect the finish quality and
efficiency. Closer distances give a smaller
pattern, wetter finish, and greater efficiency.
Greater distance will provide a large pattern
size and drier finish. The MicroPak control
circuit will enable the applicator bell to be op-
erated to within a few inches of the target with-
out adjusting the voltage setting. The recom-
mended target distance is 6 to 12-inches
(152.4-304.8mm). In general, allow 1-inch
(25.4mm) target distance for every 10kV.
GENERAL OPERATING SEQUENCE
! W A R N I N G
•
It is recommended to leave bearing air on,
unless the applicator is being serviced or re-
moved for service.
Normally, for painting application, the process
sequence should always be:
•
Bearing air on (Always On)
•
Turbine air on
•
Turbine speed to application speed
•
Shaping air on
•
Start fluid flow off part
•
Voltage on
After spraying the object, the sequence should
be:
•
Voltage lowered to 30-50 kV
•
Fluid off
•
Shaping air to setback volume
•
Turbine speed to set back speed (30,000
rpm recommended)
Recommended sample cup flush sequence is
as follows (voltage must be off) (internal and
external cup wash):
1. Turbine speed set to 25,000-30,000 rpm.
2. Set shaping air only, no inner air. Set to
350-450 slpm (12.4-15.9 SCFM).
3. Point atomizer at a grounded object such
as a booth grate.
4. Maintain solvent pressure of 100-150 psi
(689-1,034 kPa). Maintain air push pres-
sure at 80-100 psi (552-689 kPa).
5. Use an alternating trigger sequence of sol-
vent/air to create a chopping effect. Al-
ways ensure that the last step in the se-
quence is an air push.
A typical sequence is .2 seconds solvent, 1.0
second air push, 1.7 seconds solvent and 2.0
seconds final air push. This sequence may
be modified for other paints and applications.
6. It is recommended that an in-line fluid filter
be installed to ensure that no foreign de-
bris enters the fluid tip or the external
wash nozzle.
The RMA-303 is versatile in processing the
finish of a component. It can be setup as
shown in “Typical Paint Sequence” figure.
Recommended sample cup purge sequence is
as follows (voltage must be off) (internal cup
cleaning):
1. Turbine speed set to 25,000-30,000 rpm.
2. Increase shaping air to 350-450 slpm
(12.4-15.9 SCFM).
3. Paint atomizer at booth grate or insert into
bell cleaning station.
4. Maintain solvent pressure of 100-150 (689
-1,034 kPa). Maintain air push pressure at
80-100 psi (552-689 kPa).