Ransburg RMA Indirect A12869 - Manual (Page 50)

RMA-303 Indirect Charge - Operation
45 LN-9268-11.4
Figure 10: Typical Color Change Sequence
! W A R N I N G
3. Voltage On - The voltage is turned on from
a signal to the MicroPak. The lag time to full
voltage may be reduced if a setback voltage is
used. Recommended setback voltage is be-
tween 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 - Immediate-
ly precedes 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 se-
quence 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 applicator with.
PROTECTIVE COVERS
It is recommended to use covers to reduce the
amount of overspray build-up on the shroud
and electrodes. Two covers are available, a
white lint free stretch cloth for covering the
probes and a foam cover (green) for the front
shaping air shroud. The white cloth cover
should cover all of the electrode except for the
last 1-inch (25.4mm). The green foam cover
should be installed until just past the radius
edge of the shroud. Care is to be taken when
installing the white cloth covers over the elec-
trodes, do not bend them. (Devise a fixture to
help slide the cover over easier.)
When cleaning, do not get covers wet, it will
attract more overspray more quickly. Push
them back, clean surface, dry thoroughly, and
slide back to original position. Depending on
conditions, covers should be replaced after
each shift (8 hours).
Covers:
A11565-00 White Stretch, Lint Free Covers
A11564-00 - Foam Elastic Covers (Green)
> Make sure covers DO NOT trap moisture.
Moisture on covers can inhibit the perfor-
mance of the applicator. Large amounts of
trapped fluids can become floating grounds.
These conditions may lead to unwanted sud-
den discharge of energy in the form of a
spark.