DURKOPP ADLER 669 ECO - Opening the Needle Thread Tension

Operation
Operating Instructions 669 - 00.0 - 08/2019 31
Initial control-box settings for the automatic stepped reduction of
the stitch count (Speedomat), using the adjusting wheel for the
height of the alternating feed stroke:
4.6.4 Opening the needle thread tension
Suibclass 669-180010
When raising the sewing feet by means of the knee lever, the main
and supplementary tensioners are automatically opened.
Subclasses 669-180112, 669-180312
The needle-thread tensioner is automatically opened when the
thread is cut.
Parameter 188
Stufe 01-21 Entire Speedomat range
Stufe 01-10 Maximum allowed stitch count, parameter F-111 =
3000 min
1
Stufe 11-18 Linear step-wise reduction of the maximum stitch count
(Speedomat)
Stufe 19-21 Maximum allowed stitch count, parameter F-117 =
1.800 min
1