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The metal casing is coated with anti-static paint. The desi-
red equipotential bonding can be achieved by means of a
pawl socket on the back of the unit. Accordingly, the WMA3V
hot gas station fulfils all EGB safety requirements.
3. Commissioning
Lay the soldering tools used in the safety rest provided for
the purpose. Connect the corresponding connecting lines to
the control unit:
- Dispenser to rapid connection (10)
- Vacuum tube to `Vac' nipple (11)
- Air hose of hot gas pencil to `Air' nipple (9)
- Vacuum hose of de-soldering bit to `Vac' nipple (6)
- Insert the electrical connection line of the soldering tool
into the 7-pin connecting socket and lock.
Check whether the mains voltage is consistent with the
information on the model label. If the control unit's mains
voltage is correct, connect it to the mains. Connect the com-
pressed air supply at an operating pressure of 3 to 8 bars to
the compressed air connection (12) by means of a 6 mm
external diameter compressed air hose.
Caution: Inert gas or purified, dry compressed air is
required for operating the unit.
By means of pressure setting valve (13), set dispenser
pressure display (2) to approx 2 bars. Switch on the unit by
means of mains switch (1). Set desired temperature (5), hot
air flowrate (3) and dispenser time (4).
Maintenance
Air flowrate is influenced by dirty filters. Consequently the
main filters for `Vacuum' should be regularly inspected and
replaced as required. For this purpose, unscrew the filter
cover, extract the dirty filter and insert a new original Weller
filter cartridge. Check for correct seating of the cover seal,
insert the compression spring and screw the filter cover
back on with a light pressure.
4. Equipotential bonding
The various circuit elements of the 3,5 mm jack bush make
4 variations possible:
Hard-grounded:
No plug (delivery form)
Equipotential bonding: With plug, equalizer at center
contact (impedance 0 ohms)
Potential free:
With plug
Soft-grounded:
With plug and soldered resistance.
Grounding with set resistance
value.
5. Operating guideline
Nozzles are screwed into the hot gas pencil. To change nozz-
les over, use the SW8 internal hexagon key and lock with a
`C' spanner.
Caution: Max thread depth is 5 mm. A longer thread will
cause damage to the heating element.
The option exists of supplying the hot gas pencil with nitro-
gen (N2) separately. For this purpose the control unit can be
converted by means of a retrofit kit. Inert gas reduces oxida-
tion, and the flux remains active for longer. We recommend
nitrogen (N2) which can be obtained commercially in steel
bottles. The bottle must be equipped with a pressure redu-
cer of 0 to 10 bars. Furthermore a compressed air connecti-
on with an external diameter of 6 mm is required.
Soldering with hot gas (e.g. Melf 0204)
- Use the vacuum tube to place the component in the fresh
paste.
- Set hot gas temperature to approx 450˚C and set
throughflow rate to position 4.
- Keep the hot gas pencil at a distance of approx 10 mm
from the soldering tip.
- Use the finger-operated switch or the control on the
manual control panel to start air flowing through the hot gas
pencil.
- The solder paste will start to dry immediately.
- Once the solder paste is dry, bring the hot gas pencil
closer to the solder tip until the paste melts.
Please note that solder paste only has a limited shelf life.
Consequently it is important to use only fresh solder paste.
Solder paste cartridges should be stored in a cool place
when not in use. The dispenser connection is provided with
a quick-fitting connection in order to enable trapped cartrid-
ges to be straightforwardly and rapidly released from the
control unit.
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