Fixed Speed As Setpoint Source - Siemens SINAMICS G120 CU240B-2 Operating Instructions Manual

Example of parameterization of the motorized potentiometer
Table 7- 6
Parameter
P0700 = 2
P0701 = 1
P0702 = 13
P0703 = 14
P1000 = 1
P1040 = 10
P1047 = 5
P1048 = 5
7.4.4

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
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 P1020 to
P1023.
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 07/2010, FW 4.3.2, A5E02299792B AA
Implementing a motorized potentiometer using digital inputs
Description
Command source Digital inputs
Pre-assignment for digital input 0
The motor is switched on and off via digital input 0
Pre-assignment for digital input 1
The MOP setpoint is increased via digital input 1
Pre-assignment for digital input 2
The MOP setpoint is reduced via digital input 2
Setpoint selection: MOP setpoint
MOP start value
Each time the motor is switched on a setpoint corresponding to 10 rpm is specified
MOP ramp-up time:
The MOP setpoint is increased from zero to maximum (p1082) in 5 seconds
MOP ramp-down time:
The MOP setpoint is reduced from maximum (p1082) to zero in 5 seconds
wheel.
Functions
7.4 Setpoint sources
163