Ransburg RMA Indirect A12869 - Manual (Page 49)

RMA-303 Indirect Charge - Operation
LN-9268-11.4 44
Figure 9: Typical Paint Sequence
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 clean-
ing 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 typi-
cal 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.
4. Maintain solvent pressure of 100-150 psi
(689-1034 kPa). Maintain air push pressure at
80-100 psi (552-689 kPa).
5. Use an alternating trigger sequence of sol-
vent/air to create a chopping effect. Always
insure that the last step in the sequence is an
air push.
6. A typical sequence is .3 seconds solvent,
1.7 seconds air push; repeat 3 times. This
sequence may be modified for other paint and
applications.
Sequence Event Explanation:
1. Bell to Speed - This is accomplished by a
set point command from either the PLC, robot,
or other input device, through the I/O module.
2. Shaping Air On - From a setback amount,
a signal is sent to air control to increase direct
flow to a desired level to achieve pattern size,
film build, transfer efficiency, etc. Shaping air
should never be set below 70 slpm (2.6
SCFM) air flow rate.