Siemens CU240B-2 - Page 183

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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Parameters p0777 … p0780 are assigned to an analog output via their index, e.g.
parameters p0777[0] … p0770[0] belong to analog output 0.
Table 6- 4 Parameters for the scaling characteristic
Parameter
Description
p0777
x coordinate of the 1st Characteristic point [% of p200x]
p200x are the parameters of the reference variables, e.g. p2000 is the reference
speed.
p0778
y coordinate of the 1st Characteristic point [V or mA]
p0779
x coordinate of the 2nd Characteristic point [% of p200x]
p0780
y coordinate of the 2nd Characteristic point [V or mA]
Setting the characteristic
You must define your own characteristic if none of the default types match your particular
application.
Example:
Via analog output 0, the inverter should convert a signal in the value range 0 % … 100 %
into an output signal 6 mA … 12 mA.
Procedure
Set the following parameters to set the characteristic to
match the example:
1.
Set p0776[0] = 2
This defines analog output 0 as a current output.
2.
Set p0777[0] = 0.0 (x1)
3.
Set p0778[0] = 6.0 (y1)
4.
Set p0779[0] = 100.0 (x2)
5.
Set p0780[0] = 12.0 (y2)
Defining the function of an analog output
You define the analog output function by interconnecting parameter p0771 with a connector
output of your choice. Parameter p0771 is assigned to the particular analog output via its
index, e.g. parameter p0771[0] is assigned to analog output 0.
Table 6- 5 Connector outputs (CO) of the inverter (selection)
CO
Meaning
CO
Meaning
r0021
Actual frequency
r0026
Actual DC-link voltage
r0024
Output actual frequency
r0027
Output current
r0025
Output actual frequency
A complete list of the connector outputs is provided in the List Manual.