14
08/06
Operation mode "101 – bipolar absolute value"
The operation mode "101 – bipolar absolute value“ maps the bipolar analog signal
onto a unipolar input characteristic. The formation of the absolute amount takes the
characteristic into account comparable to the "bipolar" operation mode, but the char-
acteristic 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:
Δ
X = 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
signal of -1.44 V with a tolerance band of
±0.20 V. The theoretical change of sign of
the reference value is used and leads to
the tolerance band stated.
There is no change of the direction of
rotation.
4.1.5
Scaling
The analog input signal is mapped to the freely configurable characteristic. The maxi-
mum admissible setting range of the drive mechanism is to be set according to the
configuration selected via the frequency limits or the percentage value limits. In the
parameterization of a bipolar characteristic, the minimum and maximum limit for both
directions of rotation are taken over. The percentage 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
The 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
percentage values supplement the scaling of the input characteristic according 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 %
