Winder
Diameter Calculator
Description

Diameter Calculator

Provides the current diameter percentage by calculating web speed divided by reel speed, multiplied by the minimum diameter. The diameter percentage can be used to provide a speed setpoint for the reel drive;

Reel Speed Demand = Measured Web Speed * Minimum Diameter / Diameter Calculator Output

Inputs include minimum diameter, minimum speed, and preset diameter.

A web-break detection function compares the current diameter with a filtered diameter from a Low-pass, single pole recursive (IIR) filter.

When a web-break is detected, the diameter is held at its current value.

The web-break function can be disabled.

The filter time constant and comparator thesholds can be adjusted.
Availability
  • Requires library: Winder Control (option -06)
  • Firmware versions 0x100C and later
savvy-SFD Graphic diaCalc
Graphic with Parameters diaCalc

Parameters

Web Speed Input, Read-write, Analog (signed 16-bit integer)
-105.00 % to 105.00 %
Reel Speed Input, Read-write, Analog (signed 16-bit integer)
-105.00 % to 105.00 %
Absolute Web Speed Internal Parameter, Read-only, Analog (signed 16-bit integer)
0.00 % to 105.00 %
Absolute Reel Speed Internal Parameter, Read-only, Analog (signed 16-bit integer)
0.00 % to 105.00 %
Minimum Web Speed Input, Read-write, Analog (signed 16-bit integer)
0.00 % to 105.00 %
Hold Enable Input, Read-write, Boolean (signed 16-bit integer)
0 = Inactive
1 = Hold
Preset Value Input, Read-write, Analog (signed 16-bit integer)
0.00 % to 100.00 %
Preset Enable Input, Read-write, Boolean (signed 16-bit integer)
0 = Inactive
1 = Preset
Minimum Diameter Input, Read-write, Analog (signed 16-bit integer)
0.00 % to 100.00 %
Filter Time Constant Input, Read-write, Analog (signed 16-bit integer)
0.00 s to 300.00 s
0 = Off
Diameter Memory Internal Parameter, Read-write, Boolean (signed 16-bit integer)
0 = Not Persistent
1 = Persistent
Diameter Output Output, Read-only, Analog (signed 16-bit integer)
0.00 % to 100.00 %
Unfiltered Diameter Output, Read-only, Analog (signed 16-bit integer)
0.00 % to 100.00 %
Web Break Output Output, Read-only, Boolean (signed 16-bit integer)
0 = OK
1 = Web Break
Web Break Threshold Input, Read-write, Analog (signed 16-bit integer)
0.00 % to 100.00 %
Web Break Enable Input, Read-write, Boolean (signed 16-bit integer)
0 = Disabled
1 = Enabled