Lenze EVS9332xK Manual de usuario descargar pdf (Pagina 54)

Function library

Function blocks

3.2.3 Function block CDATA

3−26

EDSVS9332K−EXT EN 4.0

3.2.3.3 Create X position from a digital frequency

The digital frequency incoming at CDATA−DFIN is integrated to an X position. In this operating mode

it can be necessary to synchronise the controller to the master value (see synchronisation of X

position and machine).

l The integrator can be set to and held at CDATA−XSTART with CDATA−XRESET = HIGH.

l At the same time the output CDATA−XPOS is also set to CDATA−XSTART. Thus, the values

pending at the input CDATA−XOFFS are ineffective (see Fig. 3−6). Proceeding with

CDATA−XRESET = LOW

Synchronisation of X position and machine

Due to slipping material or non−integer pulse lengths, the angle difference between master and cam

drive may be constant or even increase. A sensor (e.g. touch probe initiator) can be used to

continuously synchronise the cam drive to the position of the machine master angle.

) Note!

l If the material is slipping, the sensor used for synchronisation should be in direct

contact with the material.

l The sensor should be set to a position where accelerations do not occur at

synchronous running to avoid as many accelerations (positive or negative) as

possible during the compensation phase.This, for instance, always happens

during a rest phase.

Synchronisation of the master axis through touch probe

The master axes synchronisation via touch probe is, for instance, used for mark−controlled cross

cutters. The master value is generated by an incremental encoder or via the digital frequency output

of an upstream controller.

l A synchronisation of the drive and machine measuring system may be required for the

following reasons:

– After mains connection, the measuring system of the controller and that of the machine can

diverge very much. The distance to be compensated in such cases often is very long.

– During operation, slipping may arise in the system (e.g. in conveying belts). During

resynchronisation, the distance to make up is relatively short.

A deviation to the setpoint detected via the touch probe signal (mark synchronisation) is output at

CDATA−X−DIFF. This deviation can be compensated by means of a compensation speed:

l Activating the function of the compensation speed (CDATA−TP−SPEED−MODE):

– C1335 = 0: without compensation limitation (Lenze setting).

– C1335 = 1: with compensation limitation (we recommend this setting).

– C1335 = 2: cross cutter (contact Lenze if you want to use this function).

l Selecting the source of the compensation speed (C1296 is only effective if C1335 = 1):

– C1296 = 0 (Lenze setting): The compensation speed is defined via C1331.

– C1296 = 1: the compensation process is controlled by selecting a profile at

CDATA−TP−SPEED−LIM.

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Lenze EVS9332xK Manual de usuario Pagina 54

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