Lenze EVF9383 - Manual (Page 219)

Configuration
Function blocks
Diameter calculator (DCALC)
8
8.2
8.2.1
l
8.2−3 EDSVF9383V EN 7.1−04/2012
By division of the speed signals at DCALC1−N−LINE and DCALC1−N−WIND, the
current diameter is calculated.
ƒ The signal at DCALC1−N−LINE has to correspond to the circumferential
speed of the reel.
ƒ The signal at DCALC1−N−WIND has to be proportional to the reel speed.
ƒ You have to adapt the signal at DCALC1−N−LINE in C1300 and C1301, so
that the value calculated corresponds to the actual diameter. The
nominal reel diameter d
max
is entered in C1304.
– For operation with the nominal reel diameter d
max
you have to enter
the 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 you alter the
integration interval (calculation cycle):
Great value in C1302
Þ high resolution
Low value in C1302 Þ low resolution
ƒ If the integrator overflows, DCALC1−OVFL is set to HIGH. The integrator
is reset internally and starts again with the calculation of the last
correct value.
ƒ A first−order low pass filters the values calculated. The filter time
constant is set via C1303.
In C1328 the current diameter is displayed.
ƒ For the conversion of the scaled calculated value to the absolute value
[mm], the reference diameter d
max
has to be entered via C1304.
ƒ At DCALC1−D−OUT the current diameter is output. The signal is scaled
to the value in C1304.
With DCALC1−HOLD = HIGH the last diameter value calculated is
maintained and the integrators are reset.
ƒ When the controller is switched off, the current diameter value is
saved. When it is switched on, the last value saved is loaded.
In C1305 the minimum diameter (d
min
) in [mm] is entered. d
min
is reached
when DCALC1−DMIN switches to HIGH.
In C1306 the maximum diameter (d
max
) in [mm] is entered. d
max
is reached
when DCALC1−DMAX switches to HIGH.
In C1307 a hysteresis for resetting the display signal is set. The entry in [%]
relates to the absolute values in C1305 and C1306.
Calculating the diameter
Displaying the diameter
Maintaining/saving the
current value
Setting/displaying the
diameter