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Programming Your Application
1-25
690+ Series Frequency Inverter
Functional Description
This function block performs the diameter calculation used by the other function blocks to
enable the control of centre wind applications.
The diameter is calculated by dividing the absolute value of LINE SPEED by the absolute value
of WINDER SPEED. This result is scaled by the MINIMUM DIAMETER parameter. The
filtered output tracks the diameter when TENSION ENABLE is True and LINE SPEED is
above MINIMUM SPEED, otherwise the diameter is held at its current value.
When the diameter is held, a preset value is used as both the input and output of the filter. This
is the value of CORE 1 or CORE 2, or the value of EXTERNAL DIAMETER.
The preset value is also loaded into the filter whenever the block diagram is restarted.
Note:
The diameter calculator will only operate with the web under some tension. The diameter
filter prevents the diameter from changing quickly in the case of web break situations. The
diameter output is clamped at the minimum diameter constant value.
Parameter Descriptions
DIAMETER TC
Range: 0.00 to 300.00 s
Filter time constant for DIAMETER output.
EXT DIAMETER
Range: 0.00 to 120.00 %
External diameter input.
LINE SPEED
Range: -110.00 to 110.00 %
Line speed input.
MINIMUM DIAMETER
Range: 0.00 to 120.00 %
Sets the smallest reel diameter (calculated diameter value at full (100%) line speed and full
(100%) winder speed).
MINIMUM SPEED
Range: 0.00 to 110.00 %
The threshold below which the diameter output is held.
WINDER SPEED
Range: -110.00 to 110.00 %
Winder speed feedback.
CURRENT CORE
Range: —.00 %
Diagnostic indicating the currently selected core size.
DIAMETER
Range: —.00 %
Diameter output.
MOD LINE SPEED
Range: —.00 %
Modulus of line speed.
MOD REEL SPEED
Range: —.00 %
Modulus of reel speed.