Velocity Edge GX440 Instructions d'exploitation télécharger pdf (Page 359)

Functions, monitoring, and protective functions

9.4 Extended functions

Drive converter cabinet units

Operating Instructions, 10/2008, A5E00288214A

359

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Figure 9-16 Position actual value conditioning

An offset can be undertaken using connector input p2513 (actual position value conditioning

offset) and a positive edge at the binector input p2512 (activate offset). When the "basic

positioner" function module is activated, p2513 is automatically connected with r2685 (EPOS

offset) and p2515 with r2684.7 (activate offset). This interconnection enables modulo offset

by EPOS, for example.

p2516 can be used to switch in position offset. Using EPOS, p2516 is automatically

interconnected to r2667. Backlash compensation is implemented using this interconnection.

Using the connector input p2515 (position setting value) and a "1" signal at binector input

p2514 (set position actual value), a position setting value can be entered.

WARNING

When the actual position value is set (p2514 = "1" signal), the actual position value of the

position controller is kept at the value of connector p2515 as standard.

Incoming encoder increments are not evaluated. A difference in position cannot be

compensated for in this situation.

An inversion of the actual position value resulting from the encoder is undertaken using

parameter p0410. An inversion of the axis motion can be entered using a negative value in

p2505.

Indexed actual value acquisition

The indexed position actual value acquisition permits e.g. length measurements on parts as

well as the detection of axis positions by a higher-level controller (e.g. SIMATIC S7) in

addition to the position control e.g. of a belt conveyor.

Two more encoders can be operated in parallel with the encoders for actual value

conditioning and position control in order to collect actual values and measured data.

The indexed acquisition of actual values can preprocess a position actual value at each of

the three encoder outputs. The parameter p2502[0...3] is used to select the encoder

evaluation for position control.

The parameters of the indexed actual value acquisition are indexed four times. The indexes

1..3 are assigned to the encoder evaluations 1..3. The index 0 is assigned to position control.

The parameter r2521[0...3] can be used to retrieve the current actual values of all connected

encoders. For example, the position actual value for position control in r2521[0] is identical

with the value r2521[1] if the position control uses encoder evaluation 1. The signal source

for a position offset can be set via parameter p2516[0..3].

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Velocity Edge GX440 Instructions d'exploitation Page 359

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