Siemens SINAMICS G120 Instructions d'exploitation télécharger pdf (Page 220)

Functions

7.9 Application-specific functions

Inverter with CU240B-2 and CU240E-2 Control Units

218 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

Scaling examples

● Speed:

Reference speed p2000 = 3000 rpm, actual speed 2100 rpm. As a consequence, the

following applies to the scaled input quantity: 2,100 / 3,000 = 0.7.

● Temperature:

Reference quantity is 100 °C. For an actual temperature of 120 °C, the input value is

obtained from 120 °C / 100 °C = 1.2.

Note

Limits within the function blocks should be entered as scaled values. The scaled value

can be calculated as follows using the reference parameter: Scaled limit value = physical

limit value / value of the reference parameter.

The assignment to reference parameters is provided in the parameter list in the individual

parameter descriptions.

Example: Logic combination of two digital inputs

You want to switch on the motor via digital input 0 and also via digital input 1:

1. Activate a free OR block by assigning it to a runtime group, and define the run sequence.

2. Interconnect the status signals of the two digital inputs DI 0 and DI 1 via BICO to the two

inputs of the OR block.

3. Finally, interconnect the OR block output with the internal ON command (P0840).

Table 7- 50 Parameters for using the free function blocks

Parameter Description

P20048 = 1 Assignment of block OR 0 to runtime group 1 (factory setting: 9999)

The block OR 0 is calculated in the time slice with 8 ms

P20049 = 60 Definition of run sequence within runtime group 1 (factory setting: 60)

Within one runtime group, the block with the smallest value is calculated first.

P20046 [0] = 722.0 Interconnection of first OR 0 input (factory setting: 0)

The first OR 0 input is linked to digital input 0 (r0722.0)

P20046 [1] = 722.1 Interconnection of second OR 0 input (factory setting: 0)

The second OR 0 input is linked to digital input 1 (r0722.1)

P0840 = 20047 Interconnection of OR 0 output (factory setting: 0)

The OR 0 output (r20047) is connected with the motor's ON command

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Siemens SINAMICS G120 Instructions d'exploitation Page 220