Siemens CU240B-2 - Page 179

Advanced commissioning
6.2 Inverter control
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
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Characteristics
If you change the analog input type using p0756, then the inverter automatically selects the
appropriate scaling of the analog input. The linear scaling characteristic is defined using two
points (p0757, p0758) and (p0759, p0760). Parameters p0757 … p0760 are assigned to an
analog input via their index, e.g. parameters p0757[0] … p0760[0] belong to analog input 0.
Image 6-4 Examples for scaling characteristics
Parameter
Description
p0757
x coordinate of the 1st Characteristic point [V or mA]
p0758
y coordinate of the 1st Characteristic point [% of p200x]
p200x are the parameters of reference variables, e.g. p2000 is the reference speed
p0759
x coordinate of the 2nd Characteristic point [V or mA]
p0760
y coordinate of the 2nd Characteristic point [% of p200x]
p0761
Wire breakage monitoring response threshold
Adapting the characteristic
You must define your own characteristic if none of the default types match your particular
application.
Example
The inverter should convert a 6 mA … 12 mA signal into the value range -100 % … 100 %
via analog input 0. The wire break monitoring of the inverter should respond when 6 mA is
fallen below.
Precondition
You have set analog input 0 as a cu
rrent input ("I") via the DIP switch on the
Control Unit.