Ransburg RMA Indirect A11600 - Manual (Page 40)

GENERAL OPERATING
SEQUENCE
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 40-50 kV
• Fluid off
• Shaping air to setback volume
• Turbine speed to set back speed
(30,000 rpm recommended)
> It is recommended to leave bearing air
on, unless the applicator is being serviced
or removed for service.
C A U T I O N
!
Recommended sample cup flush sequence is as
follows:
1. Turbine speed set to 25-30,000 rpm.
2. Shaping air set to 350-450 slpm (12.4-15.9
SCFM).
3. Point atomizer at a grounded object such as a
booth grate. Leave voltage on at 40-50 kV.
4. Assure that solvent solution is heated to 120°F
(49°C) at the applicator.
5. Maintain solvent pressure of 100-150 psi (689-
1,034 kPa). Maintain air push pressure at 80-100
psi (552-689 kPa).
6. Use an alternating sequence of solvent/air to
create a chopping effect. Always insure that the
last step in the sequence 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.
If the atomizer is utilizing an applicator cleaning
box, voltage must be turned off.
7. It is recommended that an in-line fluid filter be
installed to ensure that no foreign debris enters the
fluid tip or the external wash nozzle. The fluid filter
must be able to withstand at least 160°F (71°C).
The RMA-303 is versatile in processing the finish of
a component. It can be setup as shown in Figures
9 and 10 to process the typical finish of a target.
Recommended sample cup purge sequence is
as follows (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. Reduce high voltage to 40-50 kV.
TARGET DISTANCE
The distance between the RMA-303 atomizer
and the target will affect the finish quality and
efficiency. Closer distances give a smaller pat-
tern, 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 operated to within a few
inches of the target without adjusting the voltage
setting. The recommended target distance is 6
to 12-inches (152.4-304.8mm). In general, allow
1-inch (25.4mm) target distance for every 10 kV.
RMA-303 Indirect Charge - Operation
Ransburg
36 LN-9252-06.4