Ransburg Aerobell 168 A12787 - Manual (Page 36)

Aerobell 168 - Installation
33 LN-9270-12.3
INSTALLATION (continued)
HIGH VOLTAGE
See "Typical Multiple Application Configura-
tions" in the "Introduction" section.
INTERLOCKS
The following system interlocks are recom-
mended 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 bear-
ing air falls below 80 psi (552 kPa) at the at-
omizer, 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 inter-
locked to prevent both from being used simul-
taneously.
6. Any other interlocks required by local
code, national code, or international code.
7. High voltage must be interlocked with the
booth entry door.
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 tur-
bine 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 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 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.
Under normal operation, the high voltage
and/or coating material must never be turned
on unless the bell cup is mounted on the mo-
tor shaft and the turbine is rotating.
Pneumatic input to the turbine air inlet must
be controlled to prevent the turbine from ex-
ceeding 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 solvent trigger must be
interlocked.
! C A U T I O N