Instruction manual

EFKA AB221A/AB321A + AB222A/AB322A (BA)
55
Function with control panel V810 V820
Function “ornamental backtack” On/Off (SrS) 135 135
Ornamental backtack stop time (tSr) 210 210
Single end ornamental backtack left-hand arrow above key On Key 2 Key 4
Double end ornamental backtack right-hand arrow above key On
End ornamental backtack Off both arrows Off
The parameters of the end backtack speed and the backtack stitches forward / backward are identical with the standard end
backtack.
Difference from the standard end backtack:
 The drive stops for stitch regulator switching
 The stop time can be set
When using the V820 control panel, direct access by means of the function key (key 9) is possible!
Function with control panel Parameter
Ornamental backtack On/Off (-F-) 008 = 2
9.8 Intermediate Backtack
Upon pressing an external key according to the pre-selection of parameters 240...249, the backtack solenoid can be
switched on anywhere in the seam and at standstill.
Function with or without control panel Parameter
Counted manual backtack On/Off (chr) 087
Manual backtack speed (n13) 109
Ornamental backtack On/Off (SrS) 135
Manual ornamental backtack speed (n9) 122
Speed status for manual backtack (Shv) 145
The speed function for the manual backtack can be set using parameter 145.
145 = 0 Speed controllable by the pedal up to the set maximum speed (parameter 111)
145 = 1 Fixed speed (parameter 109) without influence by the pedal (machine stop by pressing the pedal to
the basic position)
145 = 2 Limited speed controllable by the pedal up to the set limit (parameter 109)
Intermediate backtack (parameter 135 = 0):
Backward sewing with speed limitation according to the setting of parameter 109 is performed when the key is held down.
Intermediate ornamental backtack (parameter 135 = 1):
By pressing the key in the seam, the drive stops and the backtack solenoid is activated. The speed limitation according to
the setting of parameter 288 is effective during the entire intermediate backtack operation. Backward sewing is performed
when the key is held down and the stitches are counted. When the key is released, the drive stops, the backtack solenoid is
switched off and a forward seam is performed according to the counted stitches after the ornamental backtack stop time.
After that the speed limitation is released.
Moreover, the number of stitches for each type of backtack can be selected using parameter 087.
087 = 0 stitch Normal manual backtack
087 = 1...255 stitches Manual backtack with counted backtack section
Intermediate backtack (parameter 135 = 0) with counted backtack section (parameter 087 = >0):
During manual backtack the speed is n13 (parameter 109). According to the setting of parameter 145 it is pedal controlled,
fixed or limited.
Intermediate ornamental backtack (parameter 135 = 1) with counted backtack section (parameter 087 = >0):
After pressing the appropriate key, the drive stops in position 1. The backtack solenoid is enabled. After the ornamental
backtack stop time (parameter 210) has elapsed and the pedal has been pressed forward, the drive runs until counting
(parameter 087) has been completed. The drive stops again in position 1. The backtack solenoid is disabled, and the time
set using parameter 210 elapses. Then the seam section forward is repeated. The entire sequence is performed at speed n9
(parameter 122).