Efficient Networks S120 manual Mechanical system, DfnodvkS

Models: S120

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Function modules 7.9 Basic positioner

7.9.1Mechanical system

Features

Backlash compensation (p2583)

Modulo offset (p2577)

Description

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Figure 7-14 Backlash compensation

When mechanical force is transferred between a machine part and its drive, generally backlash occurs. If the mechanical system was to be adjusted/designed so that there was absolutely no play, this would result in high wear. Thus, backlash (play) can occur between the machine component and the encoder. For axes with indirect position sensing, mechanical backlash results in a falsification of the traversing distance, as, at direction reversal, the axis travels either too far or not far enough corresponding to the absolute value of the backlash.

Note

The backlash compensation is active, after

the axis has been referenced for incremental measuring systems

the axis has been adjusted for absolute measuring systems

In order to compensate the backlash, the determined backlash must be specified in p2583 with the correct polarity. At each direction of rotation reversal, the axis actual value is corrected dependent on the actual traversing direction and displayed in r2667. This value is taken into account in the position actual value using p2516 (position offset).

If a stationary axis is referenced by setting the reference point or an adjusted axis is powered-up with an absolute encoder, then the setting of parameter p2604 (reference point approach, starting direction) is relevant for switching-in the compensation value.

Drive Functions

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Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

Page 253
Image 253
Efficient Networks S120 manual Mechanical system, DfnodvkS