Programming
Service Instructions 878-M PREMIUM - 03.0 - 10/2019 93
Test Step.Motor (Test of the stepper motor) subitem
You may use this subitem to test the stepper motors for stitch length
adjustment, sewing foot lifting/sewing foot pressure and stroke
adjustment. The machine can move to defined positions (steps),
where 2,000 steps = 360.
To test the stepper motors:
1. Select the desired motor with the
/ in the Stepper field.
Fig. 64: Test Step.Motor (Test of the stepper motor) subitem
2. Press the OK button to confirm the selection.
3. Use the
/ buttons to test the selected motor.
If the motor is functioning correctly, the behavior described in the table
will be shown.
Information
There is no specific procedure for testing the stepper motor encoders.
The encoders are tested along with the stepper motors. If the result for the
stepper motors is OK, the encoders will be functional as well.
Input Stepper motor
1 Stitch length adjustment – upper motor
2 Stitch length adjustment – lower motor
3 Sewing foot lift
Input Stepper motor Test method
1 Stitch length adjustment –
upper motor
The feed gear completes a movement.
2 Stitch length adjustment –
lower motor
The feed gear completes a movement.
3 Sewing foot lift The sewing feet perform a vertical movement.
Position:
Stepper :
OFF(0)
1
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