17 Function library
17.1 Function blocks | L_CalcDiameter_1
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Lenze · 8400 HighLine · Reference manual · DMS 12.0 EN · 06/2017 · TD23
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17.1.22.1 Set initial value
An initial value or an external diameter signal can be defined at the nSetDiameter_a input.
• this value is accepted if bLoadDiameter is set to TRUE.
• In case of acceptance, the diameter calculation will be reset and the filter for diameter
calculation is loaded with the defined initial value.
17.1.22.2 Calculate diameter
For reel diameter calculation, the material speed and the current winding speed are integrated
cyclically.
• The material speed is defined via nLineSpeed_a.
• The winding speed is calculated from the nMotorSpeedAct_v motor speed and the current
wGearNum/wGearDenom gearbox factor.
• C01050/1...2
can be used to define two different calculation cycles. The setting to the used is
selected via bCalcRef.
• At the end of each integration interval, a new diameter value results from the division of the
integrator values.
• An absolute value generation and smoothing via a first order low pass is carried out. The time
constant of this filter can be set in C01051/1
. The dwOutDiameter output is not filtered.
17.1.22.3 Select change direction, web break monitoring
By setting bUnidirect to TRUE, you only enable one change direction for diameter calculation and
simultaneously activate the web break monitoring.
• The permissible change direction can be defined via bUnwind.
• A recalculated value is only accepted if it exceeds the value saved last in the permissible
direction.
After a web break, the diameter values calculated successively mostly run very quickly in the
opposite direction.
• C01052/1
serves to define the maximally permissible deviation in the opposite direction. If it is
exceeded, the bWebBreak output is set to TRUE.
•If bUnidirect is set to FALSE, both change directions are enabled and the internal memory is
always overwritten with the recalculated value which switches off the web break monitoring.
17.1.22.4 Holding the current value
By setting bHoldD to TRUE, you fix the diameter value nDiameter_a output last.
• The diameter calculation is reset and the filter for diameter calculation is loaded with the
internally held diameter value.
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