Leister SEAMTEK W-AT Series Manual page 36

Setting the wheel pressure
Use the – and + buttons to set the wheel pressure so that the wheels are just touching without exerting any pressure
on each other. Then confirm with "OK". The wheels are then automatically pressed together by 1.5 mm.
Preparing the wedge
Switch the slider to "Auto" and activate the wedge movement. Press the pedal to move to the next step. Caution: When
the pedal is activated, the wedge will swivel to the welding position.
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