Ransburg Aerobell 33 AER5000, AER5001 - Manual (Page 22)

Aerbell 33 Rotary Atomizer - Operation
Ransburg
18 LN-9521-00.4
BEARING AIR
ADJUSTMENT
The nominal bearing air pressure is 90 psi,
measured at the rear of the atomizer. Minimum
pressure is 70 psi and maximum pressure is 100
psi. The turbine should never be operated with
less than 70 psi 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 Aerobell 33 is equipped with a bearing air
return line to monitor bearing air pressure at the
turbine manifold. When connected to the re-mote
Atomizer speed controller, operation of the turbine
will automatically be shut down whenever the
bearing air pressure falls below 60 psi.
SHAPING AIR
Shaping air is used to shape the spray pattern.
Lower input pressure results in wider pattern size,
while higher input pressure reduces the pattern
size. Shaping air does not help atomize the ma-
terial, but will assist in the penetration of atomized
particles into cavity areas. Ideally, shaping air
should be kept at the minimum pressure which will
provide a proper finish for the fluid being sprayed.
Excessive shaping air will cause some atomized
particles to blow by the target, reducing the wrap
around effect at edges and corners. Excessive
shaping air may also cause some paint particles
to bounce back onto the atomizer, causing the
atomizer surface to become contaminated.
BRAKE AIR
Brake air is used to slow the turbine speed in a
minimum length of time. It is advantageous for
short cycle times during color change, or may be
used to reduce speed or stop the turbine. Never
operate brake air with the turbine air on. Approx-
imate brake times to reduce the turbine speed
are shown in Figure 13. These times are based
on 60 psi air pressure at the brake air connector.
The use of brake air is optional, and may not be
required for many installations. The Atomizer
Module control system provides the circuitry for
automatic use of the brake air.
Figure 13: Braking Time
To Brake From (RPM)
50,000 to 40,000
50,000 to 20,000
50,000 to 0
40,000 to 20,000
40,000 to 0
Seconds
(Approx.)
3.7
7.5
10.0
4.0
9.0
† Bearing air must be on 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 with-
out bearing air will not be covered under the
Ransburg warranty.
C A U T I O N !