Siemens SINAMICS G120 Instructions d'exploitation télécharger pdf (Page 161)

Functions

7.4 Setpoint sources

Inverter with CU240B-2 and CU240E-2 Control Units

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

159

7.4 Setpoint sources

The setpoint source is the interface via which the inverter receives its setpoint. The following

options are available:

● Motorized potentiometer simulated in the inverter.

● Inverter analog input.

● Setpoints saved in the inverter:

– Fixed setpoints

– Jog

● Inverter fieldbus interface.

Depending on the parameterization, the setpoint in the inverter has one of the following

meanings:

● Speed setpoint for the motor.

● Torque setpoint for the motor.

● Setpoint for a process variable.

The inverter receives a setpoint for a process variable, e.g. the level of liquid in a

container, and calculates its speed setpoint using the internal technology controller.

7.4.1 Analog input as setpoint source

If you use an analog input as setpoint source, then you must adapt this analog input to the

type of connected signal (± 10 V, 4 … 20 mA, …). Additional information is available in

Section Analog inputs (Page 94).

Procedure

You have two options for interconnecting the setpoint source with an analog input:

1. Using p0015, select a configuration that is suitable for your application.

Please refer to the section titled Select interface assignments (Page 46) to find out which

config

urations are available for your inverter.

2. Interconnect main setpoint p1070 with an analog input of your choice.

Table 7- 15 Analog inputs as setpoint source

Parameter Setpoint source

r0755[0] Analog input 0

r0755[1] Analog input 1

Example: You interconnect analog input 0 as the setpoint source with p1070 = 755[0].

1 2 ... 156 157 158 159 160 161 162 163 164 165 166 ... 303 304

Pas de commentaire

Siemens SINAMICS G120 Instructions d'exploitation Page 161