Operational Handling; Safety Warnings; Starting/Stopping Requirements; Spray Pattern Test - WALTHER PILOT Signier 20 360 Instructions De Service

5

Operational Handling

5.1

Safety Warnings

Pay special attention to the following safety warnings prior to taking the spray gun
into operation!
• Wear proper respiratory protection masks and potective overalls whenever ope-
rating this spray gun. Air-borne particles represent a health hazard.
• Wear suitable hearing protectors. Spray guns produce sound levels of up to 83
dB (A), which are very likely to cause hearing defects.
• Open fires, naked lights and smoking is prohibited in the working area.
Spraying of readily flammable media (such as laquers, adhesive compounds) is
always accompanied by the increasing risk of fire and explosion.
5.2 Starting / Stopping Requirements
The following requirements must be met, before this spray gun can be taken into
operation:
• the control pressure must be available at the gun.
• the atomizing air pressure must be available at the gun.
• the material pressure must be available at the gun.
Caution
The material pressure shall not exceed
• 6 bar, as, otherwise, the functional reliability of the spray gun will suffer. Adjust
the control air pressure to
• at least 4 bar, in order to operate the spray gun.
High switching frequencies can loosen the pull bar (item 34). Always remove the
draw bar before taking the machine into operation.
Warning
It is important to remember that the spray gun must be relieved of all pressures
whenever work is terminated. Lines left in pressurized condition could burst, with
their contents likely to injure anybody present nearby.
5.3

Spray Pattern Test

Spray pattern tests should be performed whenever:
• the spray gun is taken into operation for the 1st time.
• the spraying medium is changed.
• the spray gun was taken apart for servicing or repairs.
The spray pattern is best tested using a workpiece sample, a sheet of metal, card-
board or paper.
Warning
Keep your hands and other extremeties away from the front of the spray gun
- imminent Risk of Injury.
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Warning
Make sure that nobody is present in the spraying zone when the gun is started
- imminent Risk of Injury.
1. Start the gun to produce a spray pattern sample (see 5.2 Starting/Stopping
Requirements).
2. Inspect the sample and readjust the settings of the gun if necessary.
Adjustment of the Material Flow Rate
The material flow rate can be adjusted by using the adjusting screw (item 33).
Screwing in the adjusting screw reduces the material rate; screwing out increases
the material rate.
Adjustment of the Material Pressure
This adjustment can only be made at the pump or the pressurized tank. Observe
the Operating Instructions and Safety Warnings issued by the manufacturer.
Adjustment of the Atomizing Air Pressure
The atomizing air pressure is to be adjusted at the air pressure reducing valve of
the compressor system. Observe the Operating Instructions and Safety Warnings
issued by the manufacturer.
5.4

Correction of Spray Pattern Imperfections

The following table shows how to correct a defective spray pattern.
Spray pattern Fault
test
Spray pattern is split in
the centre
Spray pattern is too thick
at the ends
The spray pattern shows
rather large droplets
Material application in the
centre of the spray pattern
is very thin
Spray pattern is split in
the centre
Spray pattern is very
spherical
33
desired spray result
Required adjustment
• setting a wider spray pattern
• Setting a more rounded spray
pattern
• Increase the nozzle air pres-
sure
• Decrease the nozzle air pres-
sure
• Increase the nozzle diameter
• Reduce nozzle air pressure
• Increase material pressure
• Reduce material pressure
• Increase nozzle air pressure