Ransburg RMA Indirect A11600 - Manual (Page 41)

Figure 10: Typical Color Change Sequence
DUMP TRIGGER ACTUATED
SOLVENT ON (1 SEC DURATION)
AIR ON (2 SEC DURATION)
SOLVENT ON (1 SEC DURATION)
AIR ON (2 SEC DURATION)
DUMP TRIGGER OFF
PAINT TRIGGER ON
SOLVENT ON (1 SEC DURATION)
AIR ON (4 SEC DURATION)
SEQ
U
ENC
E EV
ENT
BELL TO SPEED
INTERNAL SHAPING AIR ON
VOLTAGE ON OR UP FROM SETBACK
FLUID TRIGGER ON
SPRAY TARGET
VOLTAGE OFF OR SETBACK
FLUID OFF
INTERNAL SHAPING AIR TO SETBACK FLOW
BELL TO SETBACK SPEED
INT/EXT CUP FLUSH
COLOR CHANGE SEQUENCE
AND/OR
SEQ
U
ENC
E EV
ENT
INTERLOCK -HV OFF
Figure 9: Typical Paint Sequence
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 solvent/
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.
3. Voltage On - The voltage is turned on from a
signal to the MicroPak. The lag time to full volt-
age may be reduced if a setback voltage is used.
Recommended setback voltage is between 30kV
and 50kV.
4. Trigger Fluid - An air signal is sent through
the PT line of the tubing bundle. This should occur
when the target is 6-12-inches (152.4-304.8mm)
from the applicator centerline. (Not to be confused
with target distance.)
5. Voltage Off/Setback Voltage - Immediately
preceeds the trigger off. Using a setback voltage
shortens the cascade voltage ramp up-time.
6. Fluid Trigger Off - This should occur when
the target is typically 0 to 6-inches (0-152.4mm)
past the applicator.
7. Shaping Air to Setback - The setback flow
of air should never be below 70 slpm (2.6 SCFM).
8. Color Change Sequence - Used when color
is changed one to the other. Typical sequence is
shown in Figure 7. (Note: During this sequence,
the applicator should be moved to a position
to collect the waste material.) The sequence
shown is a starting point for processing, but the
final sequence will depend on the material being
sprayed and the solvent used to purge the appli-
cator with.
RMA-303 Indirect Charge - Operation
Ransburg
37 LN-9252-06.4