Ransburg MMA-303 Direct_Ind Charge Atomizer A12870 - Manual (Page 56)

MMA-303 Direct/Indirect Charge - Operation
53 LN-9269-11.3
!
C A U T I O N
•
Bell cup must be rotating at least 20,000 rpm
when fluid is triggered. Turning on fluid with-
out the bell cup spinning may flood the turbine
and cause damage to components. Fluid flow
and turbine rotation must have an interlock in
place.
N O T E
The bell rotational speed determines the quali-
ty of atomization and can be varied for various
paint flow rates and paint formulations. For
optimum transfer efficiency and spray pattern
control, the bell rotational speed should be set
at the minimum required to achieve proper at-
omization. Excessive speed reduces trans-
fer efficiency!
!
W A R N I N G
•
DO NOT exceed the maximum rated operat-
ing speed and turbine inlet pressure. Exces-
sive speed may cause air turbine damage or
damage to the bell.
BEARING AIR ADJUSTMENT
The nominal bearing air pressure is 90 psi
(620.5 kPa), measured at the rear of the atom-
izer. 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 pres-
sure.
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 MMA-303 is equipped with a bearing air
return line to monitor bearing air pressure at
the mounting 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).
! 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 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.
CUP WASH
It is recommended for water based material
that heated solvent be recirculated at the rear
input of the atomizer (140°F, 60°C). Typical
wash solvent is di-water and amine (8-10%
solution).
SHAPING AIR KIT #1
A12874-01/02 Shaping Air Kits for 55mm
Bell Cups (A11730-00/01 and A11783-00)
(Pattern Control Air - Direct Charge Only)
Shaping air is used to control the shape and
size of the spray pattern. Lower pressure
yields larger patterns, high shaping air pres-
sure creates a smaller pattern. Higher inner
shaping air may assist with penetration of at-