Siemens SINAMICS G120 Instructions d'exploitation télécharger pdf (Page 164)

Functions

7.4 Setpoint sources

Inverter with CU240B-2 and CU240E-2 Control Units

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

Example of parameterization of the motorized potentiometer

Table 7- 18 Implementing a motorized potentiometer using digital inputs

Parameter Description

p0015 = 9 Macro drive unit: Configure inverter on MOP as the setpoint source

• The motor is switched on and off via digital input 0.

• The MOP setpoint is increased via digital input 1.

• The MOP setpoint is decreased via digital input 2.

p1040 = 1

MOP start value

Each time the motor is switched on a setpoint corresponding to 10 rpm is specified

p1047 = 5 MOP ramp-up time:

The MOP setpoint is increased from zero to maximum (p1082) in 5 seconds

p1048 = 5 MOP ramp-down time:

The MOP setpoint is reduced from maximum (p1082) to zero in 5 seconds

7.4.3 Fixed speed as setpoint source

In many applications after switching on the motor, all that is needed is to run the motor at a

constant speed or to switch between different speeds. Examples of this simplified

specification of speed setpoint are:

● Conveyor belt with two different speeds.

● Grinding machine with different speeds corresponding to the diameter of the grinding

wheel.

If you use the technology controller in the inverter, then you can enter process variables that

remain constant over time using a fixed setpoint, e.g.:

● Closed-loop control of a constant flow with a pump.

● Closed-loop control of a constant temperature using a fan.

Procedure

You can set up to 16 various fixed setpoints and select these either via digital inputs or the

fieldbus. The fixed setpoints are defined using parameters p1001 to p1004 and can be

assigned to the corresponding command sources (e.g. the digital inputs) using parameters

p1020 to p1023.

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Siemens SINAMICS G120 Instructions d'exploitation Page 164