Operating instructions
54 06/05
Operation mode "101 – bipolar abs. value"
The operation mode "101 – bipolar abs. value“ maps the bipolar analo
g
si
g
nal onto a
unipolar input characteristic. The formation of the absolute value takes the character-
istic 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.
Characteristic point 1:
X1 = -70.00% · 10 V = -7.00 V
Y1 = -50.00% · 50.00 Hz = -25.00 Hz
Characteristic point 2:
X2 = 80.00% · 10 V = 8.00 V
Y2 = 85.00% · 50.00 Hz = 42.50 Hz
Tolerance band:
ΔX = 2.00% · 10 V = 0.20 V
(X2=80% / Y2=85%)
8V
Y
X
-25.00Hz
42.50Hz
(X1=-70% / Y1=-50%)
-7V
25.00Hz
In this example, the reference value is
again increased from an analog input sig-
nal of -1.44 V with a tolerance band o
f
±0.20 V. The theoretical change of sign o
f
the reference value is taken into account
and leads to the tolerance band stated.
T
here is no chan
g
e of the direction o
f
rotation.
5.1.5 Scaling
The analog input signal is mapped to the freely configurable characteristic. The maxi-
mum admissible settin
g
ran
g
e of the drive mechanism is to be set accordin
g
to the
confi
g
uration selected via the frequency limits or the percenta
g
e value limits. In the
parameterization of a bipolar characteristic, the minimum and maximum limit for both
directions of rotation are taken over. The percenta
g
e values of the characteristic
points are relative to the maximum limits selected.
Parameter Setting
No. Description Min. Max. Fact. sett.
418 Minimum Frequency 0.00 Hz 999.99 Hz 3.50 Hz
419 Maximum Frequency 0.00 Hz 999.99 Hz 50.00 Hz
T
he controls use the maximum value of the output frequency, which is calculated from
the
maximum frequency 419 and the compensated slip of the drive mechanism. The
frequency limits define the speed range of the drive mechanism and the reference
percenta
g
e values supplement the scalin
g
of the input characteristic accordin
g
to the
configured functions.
Parameter Setting
No. Description Min. Max. Fact. sett.
518 Minimum reference percentage 0.00 % 300.00 % 0.00 %
519 Maximum reference percentage 0.00 % 300.00 % 100.00 %