3.14 Diameter
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3.14 Diameter
The diameter is in some cases useful and necessary, such as in the following
instances:
• Control of gain
• Reduction of tension (taper) on rewinder
• Control of stop level at fast stop
• Control of range expander in some special versions
The diameter can be calculated in 3 different ways:
1. Diameter Calculated From Tension and Output [LOCAL]
A function most often used in standard load cell applications. The diameter calculated
is approximate, and not useful in applications requiring precise diameters.
2. Diameter Calculated From 2 Proximity Switches [PULSE]
The roll diameter is calculated during running by 2 proximity switches, one that
senses roll revolutions (location 1) and the other that senses web speed (locations 2,
3 or 4). At the startup after roll change, the diameter of the new roll is calculated when
the controller has received 2 pulses from the new roll. Pulse diameter calculations
are recommended for machines with a wide web tension range; these calculations
also improve fast stop function.
[LOCAL]
The processor calculates a diameter from the tension and
output. This way will not work in applications requiring a wide
web tension range.
[PULSE]
Diameter calculated from two digital input signals (2 proximity
switches).
[ANALOG]
Diameter from an external analog input signal.
Calculation of roll diameter
SD011.dsf
Brake
1. Brake pulse
2. Web pulse
3. Web pulse
4. Web pulse
