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6.2.3 Function of the thread’s supplementary tension in relation to the stroke adjustment
and the Speedomat
Only Efka DC 1550 DA 321G
The thread’s supplementary tension can, at any time, be switched on
and off by actuating the key 1 (see chapter 6.17) of the machine’s
keypad. To that end, the parameter F-255 must be set to “7".
Parameter stroke adjustment max. stroke adjustments
Setting via knee switch setting wheel
Reaching of the HP-speed
of parameter F-117
(Speedomat)
F-197 = 0 1 1
F-197 = 1 0 1
F-197 = 2 1 (*) 0
F-197 = 3 0 0
(*) If the stroke adjustment (max. via knee switch is switched on and
the HP-speed of parameter F-117 is reached through the
“Speedomat”, the thread’s supplementary tension will be switched on
automatically.
0 = Thread’s supplementary tension c losed mechanically
1 = Thread’s supplementary tension opened mechanically
·
If the thread’s supplementary tension is closed, the condition w ill
be maintained when adjusting the stroke.
·
When the machine is switched off, t he last setting of the thread’s
supplementary tension will be maintained through the mains
connection.
Basic control box setting for the automatic steps of the
stitch-number-reduction (Speedomat) through the setting wheel for
the height of the alternating transport stroke
Parameter 188
Step 01-21 total Speedomat range
Step 01-10 max. allowed number of stitches. parameter
F-111 = 2,500min
-1
Step 11-18 linear stepwise reduction of the max. number
of stitches (Speedomat)
Step 19-21 max. allowed number of stitches, parameter
F-117 = 1,600 min
-1
6.3 Opening the thread tension
Subclasses
868-190020, 868-290020
When lifting the sewing feet with the knee switch, main and
supplementary tension are automatically opened.
Subclasses
868-190322, 868-290322, 0868-390322
The thread tension is automatically opened when trimming the thread.
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