7
The operational concept of the M-series units is very simple:
– The wire feed automatically adjusts to the set welding
voltage.
– The wire feed can be corrected manually.
Operating panel
Main switch/M 2095: coarse Voltage-range
switch
Switch on the unit with the main switch/coarse voltage-range
switch
34
and select the required mains voltage/coarse volt-
age range:
400 V
(only with the M 2040, M 2060, M 2070, M 2080)
Operation via 400 V three-phase system.
230 V
(only with the M 2020, M 2040, M 2060)
Operation via 230 V alternating current system. Use
the adapter cable included in the delivery (only with
M 2040, M 2060) for connection to the alternating cur-
rent system).
0-1
(only with the M 2070, M 2090)
Operation via 400 V three-phase system.
0-1-2
(only with the M 2095)
Operation via 400 V three-phase system.
1: Low welding performance
2: High welding performance
The green mains control lamp
40
lights up.
Mode selector switch
Select the required welding mode with the mode selector
switch
36
:
2-Stroke welding
Hold the torch switch pressed: The gas valve is
opened. The wire feed speed is controlled automati-
cally, the arc is ignited.
Release the torch switch: The wire feed is stopped,
the automatically controlled burn-up period runs off.
The wire burns off so that it does not adhere to the
workpiece. The arc goes out.
4-Stroke welding
Press the torch switch briefly: The gas valve is
opened. The wire feed speed is controlled automati-
cally, the arc is ignited.
Briefly press the torch switch again: The wire feed is
stopped, the automatically controlled burn-up period
runs off. The wire burns off so that it does not adhere
to the workpiece. The arc goes out.
Spot welding
All welding spots are carried out identical.
Press the torch switch: The arc remains for the period
of the adjusted spot welding duration and then goes
out. After the arc goes out: Release the torch switch.
Step switch
The step switch
35
is used for precision tuning of the welding
performance for the electrode and the material.
Never
change the switch setting during welding.
Reduce the welding voltage with the step switch
35
when un-
dercuts are visible.
Increase the welding voltage with the step switch
35
when an
overly high welding seam is visible.
Control knob for wire-feed
The wire feed can be fine-tuned with the control knob
38
. The
wire feed is automatically controlled dependent on the adjust-
ment of the welding stage. Set control knob
38
at least to the
center position when welding within the step range of 1-5 in
order to ensure sufficient wire feed.
Reduce the wire feed if the wire comes out pulsating.
Increase the wire feed if the arc is too hot.
!!! CAUTION : with a correction less than -2.5 it could hap-
pen, that the wire feed motor stops running !!!
Control knob for spot welding
The spot welding time is adjusted with control knob
37
.
Overload indicator
When the yellow control lamp
39
lights up upon actuation of
the torch switch, the unit is subject to overload. Allow the unit
to cool down at no-load.
9 Starting up
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