Lenze E94A - Manual (Page 633)

Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
633
5 Function blocks
5.205 L_WndCalcDiameter - diameter calculation
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5.205.4 Selecting the direction of change/web break monitoring
By setting bUnidirect to TRUE, only one direction of change is enabled for the diameter calculation,
and at the same time the web break monitoring is activated.
• The permissible direction of change is defined via bUnwindActive.
• A newly calculated value is only accepted if it exceeds the value in the permissible direction
which is saved last.
After a web break the successively calculated diameter values in the majority of cases go to the op-
posite direction very quickly.
• In C04832 you can define the maximally permissible deviation in the opposite direction by the
exceedance of which the output bWebBreak is set to TRUE.
• If bUnidirect is set to FALSE, both directions of change are enabled, and the internal memory is
always overwritten with the recalculated value. By this, the web break monitoring is switched
off.
5.205.5 Limit value monitoring
Via dwMaxDiameter and dwMinDiameter you define limit values for the diameter values specified
by the achievement/exceedance of which the corresponding output (bDiameterMaxLimit/
bDiameterMinLimit) is set to TRUE.
• The unfiltered diameter value dwDiameter and the filtered diameter value dnDiameter_n are li-
mited.
• The limit values are entered in [μm].
• The hysteresis for resetting bDiameterMaxLimit/bDiameterMinLimit is set fixedly to 1 % of
dwMaxDiameter.
• For the parameterisation of further FBs, the value in dwMinDiameter relating to
dwMaxDiameter on a percentage basis is provided via output dnDiameterMin_n.