Type
RA-2 HV3
Operating Instructions
DOK-208-GB.doc
No. 0920-..,
0921-...
to, for example, loosening of a hose connection, bursting of the hose or similar.
Without atomiser air feed, the range of the material jet may be multiplied many times,
depending on the material! It is important to ensure that the control air is immediately
interrupted if there is a fall in atomiser air pressure in order to prevent material discharge.
In particularly critical cases, a spray jet monitor should be installed (using, for example, a
light barrier or a pressure monitor directly in front of the automatic spray gun - in other
words,
behind
the control element (valve or regulator)). The spray jet monitor must be
switched in such a way that the entire air feed is interrupted if there is a rapid fall in
atomiser air pressure. This also ensures interruption of the material feed.
The automatic spray gun RA-2 HV3 must always be operated using filtered air.
Both the circular jet air pressure and (where applicable) the flat jet air pressure should be
regulated via a proportional regulating valve or a pressure reducer.
Checking the connections
Interrupt
material feed
control air supply
circular jet air supply and
flat jet air supply.
No air or material must be discharged from the automatic spray gun type RA-2 HV3.
Where present, open the adjusting nut (36) of the needle stroke adjuster (see section
5.2, Mode of operation/Spray profile adjustment)
Open control air supply (the needle in the material nozzle must retract)
Open circular jet air pressure (air must flow out of the central borehole of the circular
or flat jet air nozzle)
Close circular jet air supply
Open flat jet air supply (air must flow out of the humped boreholes of the flat jet air
nozzle)
Close air supply
Connect or open material supply
Neither air nor material must be discharged from the automatic spray gun type RA-2 HV3.
Caution
Prior to starting work, ensure that the control air connection and the atomiser air
connections have not been interchanged! Risk of uncontrolled material discharge!
4.2 Mode of operation / Spray profile adjustment
Close control air supply
"Open" material feed (see following instructions)
Open circular jet air supply
Open flat jet air supply
Open control air supply (material needle (39 or 40) is pushed back by the air pressure
and releases the material flow)
The coating substance is sprayed. It is generally now necessary to adjust the spray profile.
If present, open the adjusting nut (36) of the needle stroke adjuster (see following
instructions)
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