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Calibrating the thread tensioner
Fig. 36: Calibrating the thread tensioner
(5) - Thread lever
1. Thread the sewing thread 8/3 times and on to the thread lever (5).
2. With Calibration 1 selected, measure the thread tension with a
3. Input the measured value into the controller and confirm it with OK.
4. Perform the measurement and input also for Calibration 2 and
Checking the calibration
1. Input the percentage value = 50 in the Thread tension menu.
2. Press the On button to switch on the tension.
3. Test the tension using a thread spring balance: Setpoint: 1000 cN.
4. If variations greater than ±10 % are found: Set the thread tensions
5. If the variations persist: Clean any dirt from the thread tensioners includ-
42
⑤
⑥
thread spring balance (6).
Calibration 3.
If necessary, other percentage values can be input.
once again and repeat the calibration.
ing the magnets.
(6) - Thread spring balance
Service Instructions 911-211 - 00.0 - 02/2015
Machine head
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