Configuring the position recalibration function for incremental encoders

(Original Document)

Role of recalibration

This is the module function which is used to calibrate the in relation to the machine zero or to synchronize the axis in relation to the entry of a part.

forces the position reading to a value which is predefined by the "recalibration value" parameter (within the pulse field of the ).

This function is used to compensate for any possible in the reading. It is applied to the . Each time the moving part passes in front of the detector (wired to the Irec recalibration input), the reading is recalibrated.

The configuration operation of the recalibration function consists of defining the type of signal detected on the Irec recalibration input.

Procedure

The type of recalibration is selected using a pull-down menu:

For a synchro...	If you want recalibration on detection…	then select...
Part	of a rising edge on the module Irec input	Irec rising edge
Machine without turn pulse marker	of a rising edge in forward movement of a falling edge in reverse movement on the module Irec input.	Rising edge +direction, falling edge -direction
Machine with turn pulse marker	of a rising edge in forward movement of a falling edge in reverse movement on the Zero Pulse Marker input when the Irec input is at 1.	short Cam

These are all the external elements that control the movements of the machine (reducer, encoder…).

This is the module function which is used to adjust the axis in relation to the machine zero or to synchronize the axis in relation to the arrival of a part.

Recalibration forces the position reading to a value which is predefined by the "recalibration value" parameter (included in the pulse field of the cycle).

The module allows recalibration to be carried out systematically for each cycle or for only one cycle. This recalibration is always conditioned to the IREC input.

Area in which the action of the outputs can be programmed.

This is the error of pulse loss in a cycle. This can be caused by the mechanical transmission of the axis. The module allows measurement of this slip (see: "deviation angle").

Pulse generator with 2 signals offset by 90°. These are produced according to the movement of the axis and are counted by the module.

Logic state which switches to 1 when an angular value in the cycle is overshot and which resets to 0 according to the type of cam.

A cam is systematically associated to one and only one track. Several cams can be associated to one track.