Actual signals and parameters
118
65 DIA CALC CONTROL
There are three methods used to calculate the actual diameter of the
roll; selected by 65.14 CALC DIA USING. Method 1 uses an AI from
an ultrasonic sensor. Method 2 is the internal calculator used when the
Tension or Dancer macro is selected. Method 3 is the internal
calculator used when the Lead macro is selected.
All Methods
In order for the diameter calculator to be active:
- the program is allowed to count
- 65.08 COUNT UP ENABLE is set to YES and/or
- 65.09 COUNT DOWN ENABLE is set to YES
- the line speed must be above 65.06 MIN DIA CALC SPD
- the web tension regulator is enabled
- 63.09 TENSION CTL ENABLE or
- 62.09 DANCER CTL ENABLE or
- the winder is using the Lead macro
The diameter's rate of change (per 10ms program scan) is limited to:
Method 1
There are two parameters used to scale the analog input to give a
diameter value: 65.02 MAX ROLL DIAMETER and 65.15 SENSOR
MIN DIA. The maximum input (10 VDC / 20 mA) is set to 65.02 MAX
ROLL DIAMETER and the minimum input (0 VDC / 2 mA / 4 mA) is set
to 65.15 SENSOR MIN DIA. It is assumed the measuring device is
linear.
Method 2
When a tension regulator is used, the internal calculator uses the
01.02 MOTOR SPEED, 65.01 MIN CORE DIAMETER, and ACTUAL
SPEED REF. For this calculator, it is assumed that the motor is turning
at the rate necessary for its diameter to achieve the desired line
speed; otherwise the web would be broken. With this in mind and
remembering that the ACTUAL SPEED REF is relative to the 65.01
MIN CORE DIAMETER and already accounts for the gear ratio and
PI; the following is basically the equation needed to calculate the
diameter:
Method 3
When the Lead macro is used, there is no PI regulator to compensate
for a changing diameter; therefore, 03.17 PSEUDO SPD IN is used.
03.17 PSEUDO SPD IN is derived from 67.01 WEB SPD INPUT and
67.02 WEB SPD SCALE. This value is relative to 65.01 MIN CORE
DIAMETER
No. Name/Value Description FbEq
65.07 WEB THICKNESS x 2 x 01.02 MOTOR SPEED
60 sec/min * 100 ms/sec
Dact
ACTUAL SPEED REF * 65.01 MIN CORE DIAMETER
01.02 MOTOR SPEED
=
Dact
03.17 PSEUDO SPD IN * 65.01 MIN CORE DIAMETER
01.02 MOTOR SPEED
=
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