Index revision : C - November 2017 12 7030
1.5. Important Recommendations
1.5.1. Compressed air quality
The air must be properly filtered to promote long service life and to prevent contamination
during painting.
The filter must be installed as close to the installation as possible. Filter cartridges must be
changed regularly to ensure that the air is clean.
PTFE tape or glue should not be used between the filter and the bearing, since glue residue or
pieces of PTFE may block the small holes in the air bearing and cause turbine failure.
The inside of all pneumatic hoses supplying air to the atomizer and the holes on the body must
be clean and free of any traces of paint, solvent or other foreign matter.
The warranty does not cover faults caused by unclean, unfiltered bearing area, where the
above specifications have not be observed.
WARNING :
If the air is not correctly filtered, the bearing may become fouled, resulting in a
turbine operating fault. A filtering system must be set up, in particular to prevent
particles larger than 5 µm diameter reaching the bearing.
WARNING : The warranty does not cover damage caused by foreign matter (paint,
solvent or other foreign matter) entering the air circuits of atomizer PPH 308.
1.5.2. Product quality
The paint must be filtered to prevent any damage to the atomizer.
The maximum permissible particle size in the atomizer is 200 µm.
1.5.3. Bearing safety
The compressed air connection to the magnetic air bearing must be directly coupled to the
feed circuit (no intermediate isolating valve).
The air bearing must be permanently pressurised in operation, otherwise significant damage
may be caused. A sudden shutdown of the air supply could destroy the magnetic bearing of
the turbine. Wait until the turbine has completely shut down before stopping the bearing air
supply.
Procedure for shutting off air to the air bearing:
• Switch off the turbine rotation air supply
• Wait until the turbine has completely shut down (at least 150 sec.).
• Shut off the bearing air supply.
Damage may be caused to the bearing if the turbine is operate at bearing air pressure of less
than 6 bar at the atomizer inlet. The standard bearing air pressure is 6 bar at the air control
cabinet.
All these pressure values are measured at the atomizer inlet. If bearing air pressure goes below
6 bar at the turbine or atomizer inlet, shut off air supply to the turbine.
In addition, a 25 l air reserve should be available to ensure that the turbine brakes gradually if
the main air supply is suddenly cut off.
WARNING : The warranty does not cover faults caused by turbine operation when there is
insufficient bearing air pressure.
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