Bosch Rexroth IndraDrive MPH-02 Functional Description page 443

MPH-02, MPB-02, MPD-02
Axis Zero Point, Encoder Zero
Point and Dedicated Point for
Encoders of Group 4
DOK-INDRV*-MP*-02VRS**-FK01-EN-P
axis zero point
axis slide
Fig. 8-5: Example of positions of axis zero point, dedicated point and
reference point for encoders of groups 1, 2, 3
As the position data reference can be established both by the motor
encoder and by the external encoder possibly available, there are
separate parameters for the respective reference offset available for both
encoders:
• S-0-0150, Reference offset 1 (motor encoder)
• S-0-0151, Reference offset 2 (external encoder)
The reference distance is the distance between the reference point and
the axis zero point. There are separate parameters for the respective
reference distance available for both encoders:
• S-0-0052, Reference distance 1 (motor encoder)
• S-0-0054, Reference distance 2 (external encoder)
For distance-coded measuring systems (of group 4) the axis-side
reference point is not used. The controller can calculate the position of the
dedicated point (in this case the encoder zero point) on the basis of the
detected position difference of two neighboring distance-coded reference
marks. The position difference between axis zero point and encoder zero
point is transmitted to the controller via the so-called absolute offset.
absolute offset
dedicated point =
encoder zero point
home switch
range
Fig. 8-6: Exemplary illustration of axis zero point and dedicated point for
encoders of group 4
Drive Functions
travel range
reference distance
dedicated point
machine axis
home switch
range
travel range
axis zero point
axis slide
machine axis
8-11
reference offset
reference point
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