Instruction manual

EFKA AB221A/AB321A + AB222A/AB322A (BA)
57
9.12 Reverse Motor Rotation
Function with or without control panel Parameter
Positioning speed (n1) 110
Number of reversing degrees (ird) 180
Switch-on delay of reverse motor rotation (drd) 181
Reverse motor rotation On/Off (Frd) 182
The function "reverse motor rotation" is performed after trimming. When the stop position is reached, the drive stops for
the duration of the switch-on delay of reverse motor rotation. Then it runs in reverse direction at positioning speed
according to the set degrees.
9.13 Unlocking the Chain (Mode 4/5/6/7/16)
Function with or without control panel Parameter
Number of run-out stitches upon unlocking the chain (c6) 184
Function “unlock the chain” in modes 4, 5, 6, 7 and 16 (MEk) 190
Upon unlocking the chain at the seam end, the functions backtacking, chain suction, thread trimming and tape
cutter/fast scissors are automatically suppressed. If, however, parameter 190 = 3, the function tape cutter/fast scissors is
possible. After pressing the key "unlocking the chain" and with pedal in position 0 (neutral), the drive always stops in
position 1.
Settings necessary for the operation “unlocking the chain”:
 Set “unlock the chain” using parameter 190 = 1 / 2 / 3 /4 (190 = 0 “unlock the chain” off)
 Set switch-on delay using parameter 181 and reversing angle using parameter 180
 Determine the function of the key “unlock the chain” using one of the parameters 240...249
 If parameter 290 is set at “7“, a switch at the input in1...i10 must be closed and programmed to “18“.
 If parameter 290 is set at “16“, the function “unlock the chain” must be switched on corresponding to slide-in strip 7
using key 8 on the V820 control panel.
190 = 0: Unlocking the chain Off
190 = 1: Sequence with pedal in position -2 from machine run or from position 2:
- Press key "unlock the chain"
- Run at positioning speed to position 1
- Sequence of reversing angle at positioning speed after a switch-on delay that can be set
190 = 1: Sequence with pedal in position -2 from standstill in position 1:
- Press key "unlock the chain"
- Sequence of reversing angle at positioning speed after a switch-on delay that can be set
190 = 2: Automatic sequence with light barrier at the seam end without tape cutting / pedal in position –2
according to the setting of parameter 019:
- Press key "unlock the chain"
- Run to position 1 after light barrier sensing
- Sequence of reversing angle at positioning speed after a switch-on delay that can be set
190 = 3 Automatic sequence with light barrier at the seam end with tape cutting and run-out stitches (only
possible in modes 7 and 16 and if parameter 018 = 0):
- Press key "unlock the chain"
- After light barrier sensing, execution of compensating stitches and end counting until tape cutting
- Run-out stitches until unlocking the chain can be set using parameter 184
- Sequence of reversing angle at positioning speed after a switch-on delay that can be set
190 = 4: Sequence with pedal in position –2 / no unlocking of the chain if seam end with light barrier, cutting and
run-out stitches is set:
- Press the pedal to position –2
- Run at positioning speed to position 1
- Sequence of reversing angle at positioning speed after a switch-on delay that can be set
- No unlocking of the chain at the seam end with light barrier
- Reverse motor rotation is suppressed when the drive stops. The signals “blow fabric onto stack”, M2 and
“sewing foot lift” will be issued.