2
Startup
Follow these steps to start up the RA-20R rotary
atomizer.
1. Install a nozzle and cup assembly on the RA-20R
rotary atomizer, if not already done. Refer to
Removing and Installing the Cup Assembly and
Nozzle
for instructions.
2. Turn on the system electrical power and
compressed air.
3. Supply coating material to the atomizer.
CAUTION:
Bearing air is supplied to the
turbine at system air pressure. Do not
operate the RA-20R rotary atomizer unless
the air pressure is at least 4.8 bar (70 psi), or
you will damage the turbine.
4. Check the system air pressure. Minimum air
pressure is 4.8 bar (70 psi); recommended air
pressure is 5.5
−
7 bar (80
−
100 psi).
WARNING:
Maximum speed (continuous
operation) for 1.5 in. cup is 50,000 rpm; for 2
and 2.5 in. cups is 45,000 rpm. Exceeding
these speeds can result in personal injury or
property damage.
5. Turn on the turbine air and set the turbine speed:
S
If your system has manual speed controls,
adjust the UNLOADED regulator until the
turbine is rotating at the desired speed.
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If your system has automatic speed controls,
set the turbine speed at the ASC-6 or system
control panel.
6. Trigger the valve to spray coating material. Check
the turbine speed. If your system has manual
speed controls, adjust the LOADED regulator until
the turbine is rotating at the desired speed.
7. Turn on vector air and adjust the vector air
pressure to obtain the desired spray pattern.
8. Turn on the electrostatic voltage and start
production.
Modifying the Spray Pattern
To modify the spray pattern, change one or more of
the following:
S
vector air pressure
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turbine air pressure (speed)
S
fluid pressure
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cup and distributor
S
electrostatic voltage
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cup-to-part distance
Modifying the Flow Rate
To modify the flow rate,
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adjust the fluid pressure
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change the nozzle or fluid tube
Shutdown
Follow these steps to shut down the RA-20R rotary
atomizer.
1. Turn off the electrostatic voltage.
2. Flush the atomizer. Refer to
Flushing
.
WARNING:
High-speed rotating equipment
can be hazardous. Let the turbine coast to a
stop, or use brake air to stop it. Do not try to
stop the turbine with your hands or by any
other means. Failure to observe this warning
may result in equipment damage, personal
injury or even death.
3. Shut off the turbine air. Use the brake air to stop
the turbine, or let it coast to a stop.
4. Remove the cup assembly from the turbine and
unscrew the distributor from the cup. Refer to
Removing and Installing the Cup Assembly and
Nozzle
.
5. Soak the cup and distributor in a solvent or
cleaning solution compatible with your coating
material.
6. Shut off the system compressed air and electrical
power.
Long-Term Shutdown
If you are shutting down the system for more than a
day, flush the entire system with a compatible solvent
or cleaning solution.
