Lenze 931W - Manual (Page 60)

Software implementation and parameter setting
Reference menu
Absolute resolver position
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60 HB 13.0001-EN 3.0
For setting the absolute resolver position of 0 increments, referencing is carried out
directly to the zero pulse which is nearest to the edge.
In case of a specification of 1 to 4095 increments, the zero pulse can be ”shifted” in positive
direction by the set number of increments, or it can be rotated within a motor revolution.
Thus it is possible to optionally position the zero pulse within a motor revolution.
By the possibility of shifting the zero pulse - irrespective of the actual position of the real
zero pulse - the reference signal can be placed behind as well as in front of an edge in any
position. This is clarified by means of the following example.
Referencing to zero pulse in front of the reference
signal edge (absolute resolver position = 0)
Referencing to zero pulse behind the reference signal
edge (absolute resolver position = 2048)
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Example 1 Example 2
 Reference signal level  Zero pulse
 Home position  V
reference
 Position  Zero pulse adjustment
Fig. 3 Integrating the absolute resolver position into the referencing process
Both of the reference runs represented in the Fig. 3 are based on the same position of the
zero pulse and the edge of the reference signal.
Example 1 the home position is to be placed in front of the rising edge of the reference
signal. As the zero pulse is placed in front of the edge at minimum distance from the edge,
an adjustment of the absolute resolver position is not required. The absolute resolver
position is therefore selected at 0 increments.
Example 2 the home position is to be placed behind the rising edge. For this purpose, an
”adjustment” of the zero pulse is required. The zero pulse (dotted line) is shifted by 2048
increments (half a revolution), so that the nearest zero pulse is placed behind the edge
(dashed line). The target of a home position behind the rising edge therefore can be
reached.