7.3 Potentiometer for Automatic Speed Limitation
The FA-Version sewing machine is equipped with a potentiometer for
speed limitation in case of higher strokes.
The potentiometer 3 is mechanically connected with the setting wheel
on the arm cover via shaft 2, lever 1 and ball stud.
The control recognizes the set sewing foot stroke via potentiometer 3
and adapts the speed automatically.
Caution: Danger of injury !
Switch off main switch.
Check and adjust position of the potentiometer only when sewing
machine is switched off.
Standard checking
The sewing machine has to be checked according to the following
description.
–
Set the minimum foot stroke “min” by setting wheel.
–
Take off cover of the machine head distributor.
–
Separate plug X14 from the distributor.
–
Remove arm cover.
–
Measure the resistance at the green (a) and the brown (b) cable of
potentiometer 3 with an ohmmeter. The resistance should amount
to approx. 9 kOhm.
–
Set the maximum foot stroke “max” by setting wheel.
–
Pull lever 1 in the centre of the sewing head as far as it will go.
–
Measure the resistance at the green (a) and the brown (b) cable of
potentiometer 3 with an ohmmeter. The resistance should amount
to approx. 1 kOhm.
–
Reconnect plug X14 to the distributor.
–
Mount arm c over.
–
Mount cover of the machine head distributor.
–
The adjustment has to be checked with parameter 188 afterwards.
31
GB
1
2
3
X14
4
321
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