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HIGH VOLTAGE
See "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 mate-
rial 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
80 psi (552 kPa) at the atomizer, the turbine air
should be automatically interlocked to shut off.
4. High voltage must be interlocked with the
solvent valve pilot signal to prevent solvent flow
while high voltage is energized.
5. Turbine air and brake air must be interlocked
to prevent both from being used simultaneously.
6. Any other interlocks required by local code,
national code, or international code.
7. High voltage must be interlocked with the booth
entry door.
8. High voltage must be interlocked through the
power unit with conveyor and booth fan air. Ref-
erence manual CP-13-02 for procedures.
LN-9282-14
Aerobell 268 - Installation
W A R N I N G
!
When the turbine air is turned off, the
†
turbine 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.
Under normal operation, the high volt-
†
age 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 ei-
ther through the applicator supply or the
cup wash line. High voltage and solvent trig-
ger must be interlocked.
Never spray solvent with high voltage on.
†
C A U T I O N
!
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. Mate-
rial flow checks (flow rate verification) must
be made with the bell cup 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 by passed with proper safety proce-
dures 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.
29
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