Configuration
Function blocks
Diameter calculator (DCALC)
8
8.2
8.2.1
8.2-3
EDSVF9333V EN 3.0-06/2005
The actual diameter is calculated by dividing the speed signals at
DCALC1-N-LINE and DCALC1-N-WIND.
ƒ The signal at DCALC1-N-LINE must c orrespond to the circumferential
speed of the reel.
ƒ The signal at DCALC1-N-WIND must be proportional to the winding
speed.
ƒ For correspondence of the calculated value with the real diameter, the
signal must be adapted to DCALC1-N-LINE in C1300 and C 1301. The
nominal reel diameter d
max
is indicated in C1304.
– When using the nominal reed diameter d
max
,youmustenterthe
value at input DCALC1-N-WIND in C1300 and the value at input
DCALC1-N-LINE in C1301.
ƒ The input signals are integrated cyclically. In C1302 the integration
interval can be changed (calculation cycle):
High value in C1302 ⇒high resolution
Low value in C1302 ⇒low resolution
ƒ When the integrator overflows, DCALC1-OVFL is set to HIGH. The
integrator is reset internally and restarts with calculating the last
correct value.
ƒ A first order low pass filters the calculated values. The filter time
constant is set via C1303.
In C1328 the actual diameter is indicated.
ƒ For the conversion of the scaled calculated value into the absolute
value [mm], the reference diameter d
max
must be entered under
C1304.
ƒ The actual diameter is output at DCALC1-D-OUT. The signal is scaled to
the value in C1304.
With DCALC1-HOLD = HIGH the last-calculated diameter value is kept and
the integrators are reset.
ƒ When the controller is switched off, the actual diameter value is saved.
When the controller is switched on, the last-saved value is loaded.
In C1305 the minimum diameter (d
min
) is entered in [mm]. d
min
is reached
when DCALC1-DMIN switches to HIGH.
In C1306 the maximum diameter (d
max
) is entered in [mm]. d
max
is reached
when DCALC1-DMAX switches to HIGH.
In C1307 a hysteresis for resetting the display signal is set. The entry in [%]
refers to the absolute values in C1305 and C1306.
Calculating the diameter
Displaying the diameter
Holding/Saving the current
value
Setting/displaying of the
diameter
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