7.3 Speed control unit SWG2
The SWG2 is attached to the underside of the machine table with the enclosed brackets and connected
mechanically to the machine’s pedal by means of the enclosed rod assembly.
The mains connection of the SWG2 is by means of a nine-pole connector on plug X3 on the rear
control panel.
The SWG2 is an analogous mechanoelectronic converter, which converts the pedal path into analog
voltage. This analog output voltage of the SWG2 is digitized in the control system so that the pedal path
can be divided into 16 steps (positions).
Level
Position
Voltage [V]
Meaning
0
-2 (full backwards)
0,00 - 0,50
Seam end, thread trimming
1
-1 (a little backwards)
0,50 - 0,94
Presserfoot up
2
0 (neutral position)
0,94 - 1,76
Treadle position 0
3
+1
1,76 - 2,21
Presserfoot down
4
+1 D
2,21 - 2,43
Speed n1
5
+2 D
2,43 - 2,66
Speed n2
6
+3 D
2,66 - 2,90
Speed n3
7
+4 D
2,90 - 3,13
Speed n4
8
+5 D
3,13 - 3,37
Speed n5
9
+6 D
3,37 - 3,60
Speed n6
10
+7 D
3,60 - 3,84
Speed n7
11
+8 D
3,84 - 4,07
Speed n8
12
+9 D
4,07 - 4,31
Speed n9
13
+10 D
4,31 - 4,54
Speed n10
14
+11 D
4,54 - 4,78
Speed n11
15
+12 D
4,78 - 5,00
Speed n12
Pin connection of speed control plug (X3) of the SWG2
0 … 5V
control voltage (set point, rated value)
Q-41-MSII-2-EN
7.4
02-02-21
+5V
0V
1
2
3
4
5
6
7
8
9
