Fluid v, Turbine speed – Ransburg Aerobell M Rotary Atomizer 78101 User Manual

Page 21

LN-9237-00.1

Aerobell M Rotary Atomizer - Operation

FLUID V

FLUID VAL

ALVE CONTROL

VE CONTROL

(Trigger

rigger

rigger, Dump & Solvent)

, Dump & Solvent)

The fluid valves in the Aerobell M are actuated
by an air signal. The air pressure must exceed
70 psi to assure proper actuation of the valve.
Applying air to the valve actuator turns on the
fluid flow for that valve.

The trigger valve controls the paint flow to the
bell. When actuated, paint flows through the
valve to the fluid tube, and into the rear of the
bell cup. The bell must be spinning at least
10,000 rpm when fluid is turned on to enable the
fluid to flow through the bell paint passage holes
and be atomized.

The dump valve controls the paint flow through
the dump line. When actuated, paint flow is di-
rected to the dump return line. This provides a
method of rapidly removing paint from the in-
coming line for cleaning and/or color change.
Normally, the dump valve is not actuated at the
same time as the paint trigger valve since the
trigger valve is intended to cause the fluid to
flow to the bell at the prescribed input pressure.

The solvent valve controls the flow of cleaning
solvent to the bell. When actuated, solvent
flows through the manifold and fluid tube and
into the rear of the bell cup. This provides
cleaning of the inside of the bell cup. The sol-
vent valve is not triggered at the same time as
the paint trigger valve to prevent solvent from
flowing backward into the paint line.

The normal fluid flow range is 25-500

cc/minute. During a color change or when
flushing the system, higher flow rates may
be required. However, the maximum flow
rate must not exceed 500 cc/minute to
avoid solvent or paint from flooding into
the internal portion of the air bearing
motor assembly or front shroud.

High voltage must be interlocked with

the solvent valve to prevent solvent
spraying while high voltage is on.

When flushing the Aerobell M, always

flush through the dump valve

dump valve

dump valve rather than

the trigger valve. Only use solvent to
flush the fluid tube in the bell. A solvent/
air mixture or sequence will cause paint
buildup on the fluid tube.

TURBINE SPEED

Turbine speed is determined by the input pres-
sure at the rear of the atomizer.

Turbine speed is intended to be closed loop
controlled using the fiber-optic speed transmit-
ter, located on the turbine manifold. A speed
input to a remote speed controller, such as the
Atomizer Module, is recommended.

The bell rotational speed determines

the quality of atomization and can be var-
ied for various paint flow rates and paint
formulations. For optimum transfer effi-
ciency and spray pattern control, the bell
rotational speed should be set at the mini-
mum required to achieve proper atomiza-
tion. Excessive speed reduces transfer

Excessive speed reduces transfer

efficiency!

Do not exceed the maximum rated

intermittent operating speed and turbine
inlet pressure (55,000 rpm at approxi-
mately 45 psi for the 30mm bell, 55,000
rpm at approximately 60 psi for the 57mm
bell, and 40,000 rpm at approximately 70
psi for the 70mm bell). Excessive speed
may cause air turbine damage or damage
to the bell.

C A U T I O N

!!!!!

W A R N I N G

!!!!!

NOTE

W A R N I N G

!!!!!