Velocity Edge GX440 Operations Instructions Page 361

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Functions, monitoring, and protective functions
9.4 Extended functions
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
361
Example: Absolute encoder can count 8 encoder revolutions (p0421 = 8)
Note
Load gear problems and solutions, see example in "Position tracking/Measuring gear".
Position range extension example
With absolute encoders without position tracking, it must be ensured that the traversing
range is 0 smaller than half the encoder range, because, beyond this range, no unique
reference remains after switch-on and switch-off (see description on parameter p2507). This
traversing range can be extended using the virtual multiturn (p2721).
For reasons of presentation, an absolute encoder was selected in the figure below that can
represent 8 encoder revolutions (p412 = 8). The parameter p2721 is pre-assigned a value of
512. To simplify the presentation, p2721=24 as well as a setting of p2504 = p2505 =1 (gear
factor = 1) were selected.
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Figure 9-17 Load gear position tracking (p2721 = 24)
In this example, this means:
Without position tracking, the position for +/- 4 encoder revolutions about r2521 = 0 LU
can be reproduced.
With position tracking, the position for +/- 12 encoder revolutions can be reproduced
(p2721 = 24).
Practical example:
For a linear axis, the value for p2721 is set to 262144 for an encoder with p0421 = 4096.
That means, +/- 131072 encoder revolutions or load revolutions can be reproduced in this
way.
For a rotary axis, a value for p2721 = p0421 is set for an encoder.
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