Ransburg RMA Dual Purge Direct A12300 - Manual (Page 48)

RMA-303 Dual Purge/Direct Charge - Operation
43
BEARING AIR
ADJUSTMENT
The nominal bearing air pressure is 90 psi
(620.5 kPa), measured at the rear of the atomiz-
er. Minimum pressure is 80 psi (551.6 kPa) and
maximum pressure is 100 psi (689.5 kPa). The
turbine should never be operated with less than
80 psi (551.6 kPa) bearing air pressure.
Bearing air must be present when turning the
turbine on. Bearing air must remain on when
the turbine air is turned off until the turbine stops
spinning. Never turn off bearing air to cause the
turbine to stop spinning. If connected, brake air
can be used to slow the turbine.
The RMA-303 is equipped with a bearing air
return line to monitor bearing air pressure at the
turbine manifold. When connected to the remote
Serial Atomizer speed controller, operation of the
turbine will automatically be shut down whenever
the bearing air pressure falls below the dip switch
setting of 80 psi (551.6 kPa).
SHAPING AIR KIT #1
A12089-01/02 Shaping Air Kits
(For A11730-00/01 and A11783-00)
55mm Bell Cups (Pattern Control
Air)
Shaping air is used to control the shape and size
of the pattern. Lower pressure yields larger pat-
terns, higher shaping air pressure creates a smaller
pattern. Higher shaping air may be used to assist
with penetrations of atomized particles into cavity
areas. The amount of shaping air should be opti-
mized for the specific applications. Excessive air
pressure will cause atomized particles to blow by
the target, reducing electrostatic wrap and lowering
transfer efficiency. Excessive air may also cause
some paint particles to bounce off the target and
deposit on the atomizer.
Connection is made using the "blue" 8mm tube
labeled "SAI" on the tubing bundle. The other
8mm tube is labeled "SAO" and is "gray" in color
and must be plugged. However, if additional air
is required, this tube can be connected to a sec-
ondary controlled air source. Precautions must
be taken that one does not have a significantly
higher pressure than the other to avoid back flow.
Ransburg
LN-9263-08.5
W A R N I N G
!
† DO NOT exceed the maximum rated
operating speed and turbine inlet pressure.
Excessive speed may cause air turbine
damage or damage to the bell.
C A U T I O N
!
† Bearing air MUST be ON and supplied
at a minimum of 80 psig (551.6 kPa) whenever
the turbine is operated. If not, severe bear-
ing damage will occur. It is recommended
that bearing air be left turned on at all times,
except during maintenance or disassembly.
† Bearing damage (and subsequent tur-
bine failure) caused by running the turbine
without bearing air WILL NOT be covered
under the Ransburg warranty.
NOTE
† A minimum of 70 slpm (2.6 SCFM)
should always be kept flowing in the inner
shaping air passage to keep the face of the
applicator clean during manual cleaning
breaks.