Ransburg RMA Direct A12867 - Manual (Page 51)

RMA-303 Direct Charge - Operation
LN-9266-11.3 48
BEARING AIR ADJUSTMENT
The nominal bearing air pressure is 90 psi
(620.5 kPa), measured at the rear of the at-
omizer. 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 connect-
ed, 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, oper-
ation 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).
!
W A R N I N G
•
Bearing air MUST be ON and supplied at a
minimum of 80 psig (551.6 kPa) whenever the
turbine is operated. If not, severe bearing
damage will occur. It is recommended that
bearing air be left turned on at all times, ex-
cept during maintenance or disassembly.
•
Bearing damage (and subsequent turbine
failure) caused by running the turbine without
bearing air WILL NOT be covered under the
Ransburg warranty.
SHAPING AIR KIT #1
A12874-01/02 Shaping Air Kits for 55mm
Bell Cups (A11730-00/01 and A11783-00)
(Pattern Control Air)
Shaping air is used to
control the shape and size of the spray pat-
tern. Lower pressure yields larger patterns,
high shaping air pressure creates a smaller
pattern. Higher shaping air may assist with
penetrations of atomized particles into cavity
areas. The amount of shaping air should be
optimized for the specific applications. Exces-
sive air pressure will cause atomized particles
to blow by the target, reducing electrostatic
wrap and lowering transfer efficiency. Exces-
sive 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 ad-
ditional air is required, this tube can be con-
nected to a secondary controlled air source.
Precautions must be taken that one does not
have a significantly higher pressure than the
other to avoid back flow. This shaping air
combination can be used with either the alumi-
num 55mm bell cup or the 55mm Titanium bell
cup. “Air Flow” information can be found in
the “Introduction” section of this manual.
N O T E
NOTE - A minimum of 70 slpm (2.6 SCFM)
should always be kept flowing in the shaping
air passage to keep the face of the applicator
clean during manual cleaning breaks.