88 EM-ABS-01 for ACU 03/12
Operation mode "101 – bipolar Amount"
The operation mode "101 – bipolar Amount“ maps the bipolar analo
si
nal onto a
unipolar input characteristic. The formation of the absolute amount takes the charac-
teristic into account comparable to the "bipolar" operation mode, but the characteristic
points are reflected on the X axis with a negative value for the Y axis.
(X2=80% / Y2=85%)
8V
Y
X
-25.00Hz
42.50Hz
(X1=-70% / Y1=-50%)
-7V
25.00Hz
Point 1:
X1 = -70.00% · 10 V = -7.00 V
1 = -50.00% · 50.00 Hz = -25.00 Hz
Point 2:
X2 = 80.00% · 10 V = 8.00 V
2 = 85.00% · 50.00 Hz = 42.50 Hz
Tolerance band:
ΔX = 2.00% · 10 V = 0.20 V
In this example, the reference value is
again increased from an analog input sig-
nal of -1.44 V with a tolerance band o
±0.20 V. The theoretical chan
e of si
n o
the reference value is taken into accoun
and leads to the tolerance band stated.
here is no chan
e of the direction o
rotation.
8.1.4 Scaling
The analog input signal is mapped to the freely configurable characteristic. The maxi-
mum admissible settin
ran
e of the drive mechanism is to be set via the frequency
limits or percenta
e limits accordin
to the confi
uration selected. In parameterization
of a bipolar characteristic, the minimum and maximum limits for both directions o
rotation are taken on. The percenta
e values of the points relate to the maximum
limits selected.
Parameters Settings
No. Description Min. Max. Factory set-
ting
418 Minimum frequency 0.00 Hz 999.99 Hz 3.50 Hz
419 Maximum frequency 0.00 Hz 999.99 Hz 50.00 Hz
The control system uses the maximum value of the output frequency, which is calcu-
lated from the
Maximum Frequency 419 and the compensated slip of the drive me-
chanism. The frequency limits define the speed ran
e of the drive, and the percenta
e
values supplement the scalin
of the analo
input characteristic in accordance with
the functions configured.
Parameters Settings
No. Description Min. Max. Factory set-
ting
518 Minimum percentage 0,00% 300,00% 0,00%
519 Maximum percentage 0,00% 300,00% 100,00%
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