Selection of motor and feedback
- 1. In the Solution Explorer, expand the tree under the "Drive Manager 2 Project".
- 2. Double click on "Ch A".
- The Drive Manager 2 opens.
- 3. Select motor and feedback.
Feedback
When selecting the feedback, observe the following general conditions, especially the maximum input frequency:
Signal type | Max. input frequency 1) | Current sink 2.5 mA | Signal level | Signal level | Comment |
|---|---|---|---|---|---|
RS422 differential | 4 million inc/s | no | Udiff < -0.45 V | Udiff > +0.45 V | - |
TTL single ended | 250 kInc/s | yes | < 0.8 V | > 3.0 V | - |
TTL single ended – input filters disabled | 1 million inc/s | yes | < 0.8 V | > 3.0 V | Higher signal frequency possible. More sensitive to interference. |
Open collector | 125 kInc/s | no | < 0.8 V | > 2.0 V | Encoder switches to ground |
1) with 4-fold evaluation.
Field-oriented control
Field-oriented control can be activated if feedback is used with at least 4096 counting steps per revolution. This minimum number of counting steps can be achieved, for example, with an incremental encoder with 1024 pulses per revolution, since 4096 steps per revolution are counted due to the 4-fold evaluation (quadrature decoder).
Advantages:
- More efficient control
- Load-dependent current; this enables homing "on block", for example
To activate field-oriented control, select "Stepper FOC with encoder" in the "Commutation type" field:
Note: The field-oriented control performs a commutation finding for each axis enable, during which the shaft moves a few degrees in both directions. The rotor must be able to turn in both directions.