User guide

5 Function blocks
5.205 L_WndCalcDiameter - diameter calculation
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Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.205.1 Setting an initial value
At the input dnSetDiameter_n you can specify an initial value or an external diameter signal.
• This value is accepted if bLoadSetDiameter is set to TRUE.
• During the acceptance, the diameter calculation is reset and the filter for the diameter calcula-
tion is loaded with the initial value specified.
5.205.2 Calculating the diameter
For calculating the reel diameter, the material speed and the current reel speed are cyclically inte-
grated.
•The material speed is specified via dnLineSpeed_n.
• The reel speed results from the motor speed (dnActualMotorSpeed_s) and the current gearbox
factor (dnGearNumerator/dnGearDenominator).
• The calculation cycle is defined via the input dwCalculationDistance.
• At the end of each integration interval a new diameter value results from the division of the in-
tegrator values.
• An absolute value generation and smoothing via a first order low pass is effected. The time con-
stant of this filter can be set in C04831. The output dwDiameter is not filtered.
Converting the diameter to 1/D
For evaluating the material speed with 1/D (speed-controlled winders), the reciprocal value of the
reel diameter is provided via output dnRezipDiameter_n.
• This value refers to the limit value dwMinDiameter.
5.205.3 Holding the current value
By setting bHoldDiameter to TRUE, the last diameter value dnDiameter_n that is output is held in-
ternally.
• The diameter calculation is reset and the filter for the diameter calculation is loaded with the
diameter value that is held internally.