Ransburg Aerobell (Std.) Rotary Atomizer A12381 - Manual (Page 35)

> Under normal operation, the high voltage
and/or coating material must never be turned
on unless the bell cup is mounted on the
motor shaft and the turbine is rotating.
>
Pneumatic input to the turbine air inlet
must be controlled to prevent the turbine
from exceeding the maximum rated speed
of 60,000 rpm. (See "Specifications" in the
"Introduction" section.)
> High voltage must never be turned on
while cleaning solvent is being sprayed either
through the applicator supply or the cup wash
line. High voltage and both solvent triggers
must be interlocked.
HIGH VOLTAGE
(See Figures 2 and 3 "Typical Multiple Application
Configurations" in the "Introduction" section.)
INTERLOCKS
The following system interlocks are recommended
to prevent equipment damage:
1. Bearing air should remain on at all times and
should be shut off only by turning off the main air
to the pneumatic control cabinet.
2. It should not be possible for the coating material
to be sprayed unless the turbine is spinning.
3. Two (2) interconnected bearing air ports are
provided, one for supply air and the other to be
used as a return signal for measuring bearing air
pressure at the atomizer. If bearing air falls below
60 psi (413 kPa) at the atomizer, the turbine air
should be automatically interlocked to shut off.
This interlock is provided by the Serial Atomizer
Module (see current "Serial Atomizer" manual).
4. High voltage must be interlocked with the
solvent valve pilot signal to prevent solvent flow
while high voltage is energized.
> When the turbine air is turned off, the tur-
bine will continue to operate or "coast down"
for about two minutes. Provisions should
be made to assure that the operator waits
at least three minutes, after shutting off the
turbine air and before shutting off the main
air supply.
> The bell cup must be removed when making
flow checks. If the paint is turned on when
the bell is mounted and the turbine shaft is
not rotating, paint will enter the shaft and
possibly damage the air bearing. Material
flow checks (flow rate verification) must be
made with the bell cup off and the turbine
not rotating. Normally pneumatic interlocks
will not allow the paint to trigger on when the
turbine air is off. These interlocks may need
to be bypassed with proper safety procedures
as required.
> Bell cup must be rotating at least 10,000
rpm when fluid is triggered. Turning on fluid
without the bell cup spinning may flood the
turbine and cause damage to components.
> Never spray solvent with high voltage on.
5. Turbine air and brake air must be interlocked to
prevent both from being used simultaneously.
This interlock is provided by the Serial Atomizer
Module (see current "Serial Atomizer"manual).
W A R N I N G !
W A R N I N G !
C A U T I O N
!
C A U T I O N
!
Aerobell - Installation
31 LN-9264-08.2
Ransburg