Velocity Edge GX440 Instructions d'exploitation télécharger pdf (Page 363)

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Functions, monitoring, and protective functions

9.4 Extended functions

Drive converter cabinet units

Operating Instructions, 10/2008, A5E00288214A

363

Tolerance window (p2722)

After switching on, the difference between the stored position and the actual position is

ascertained and, depending on the result, the following is triggered:

● Difference within the tolerance window -> the position is reproduced based on the current

actual encoder value.

● Difference outside the tolerance window -> an appropriate message (F07449) is output.

The tolerance window is preset to quarter of the encoder range and can be changed.

CAUTION

The position can only be reproduced if, in the powered-down state, if the encoder was

moved through less than half of the range that it can represent. For the standard EQN1325

encoder, this is 2048 revolutions or half a revolution for singleturn encoders.

Note

The ratio stamped on the gear rating plate is often just a rounded-off value (e.g.1:7.34). If, for

a rotary axis, it is not permissible to have any long-term drift, then the actual ratio of the gear

teeth must be requested from the gear manufacturer.

Several drive data sets

As of FW version V2.6, position tracking of the load gear can be activated in several drive

data sets.

● The load gear is DDS-dependent.

● Position tracking of the load gear is calculated only for the active drive data set and is

EDS-dependent.

● If position tracking is to be continued in different drive data sets with the same

mechanical relationships and the same encoder data sets, it must be activated explicitly

in all relevant drive data sets. Possible applications for drive data set changeover with

continued position tracking:

– Star/delta changeover

– Different ramp-up times/controller settings

● On changeover of the drive data set where the gear is changed, position tracking is

restarted, i.e. the behavior after changeover is the same as after a POWER ON.

● For identical mechanical relationships and the same encoder data set, DDS changeover

has no effect on the calibration status and reference point status.

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Velocity Edge GX440 Instructions d'exploitation Page 363

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