Ransburg MMA-303 Direct_Ind Charge Atomizer A12870 - Manual (Page 52)

MMA-303 Direct/Indirect Charge - Installation
49 LN-9269-11.3
INTERLOCKS
The following system interlocks are required to
prevent equipment damage:
•
Bearing air should remain on at all times
and should be shut-off by turning off the
main air to the pneumatic control cabinet.
•
It should not be possible for the coating
material to be sprayed unless the turbine is
spinning.
•
Two inter-connected 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 (551.6 kPa) at
the atomizer, the turbine air should be au-
tomatically interlocked to shut off. This in-
terlock is provided by the Serial Atomizer
Module. (See current “Serial Atomizer”
service manual.)
•
High voltage must be interlocked with the
solvent valve pilot signal to prevent solvent
flow while high voltage is energized (direct
charge only).
•
It is recommended that the booth entry
door be interlocked with high voltage and
turbine speed to prevent possible personal
injury.
•
Turbine air and brake air must be inter-
locked to prevent both from being used
simultaneously. This interlock is provided
by the serial atomizer mode. (See current
”Serial Atomizer” manual.)
•
Any other interlocks required by local na-
tional code or international code.
!
C A U T I O N
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.
•
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 rotat-
ing, 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. Nor-
mally 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 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.
•
When the turbine air is turned off, the turbine
will continue to operate or “coast down” for
about two minutes. Provisions should be
!
W A R N I N G
•
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 ex-
ceeding the maximum rated speed of 70,000
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 b e interlocked (direct charge only).
•
Never spray solvent with high voltage on
(direct charge only).
! C A U T I O N (Continued)