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

Functions
7.4 Setpoint sources
Example of parameterization of the motorized potentiometer
Table 7- 18
Parameter Description
p0015 = 9
p1040 = 1
0
p1047 = 5
p1048 = 5
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
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.
162
Implementing a motorized potentiometer using digital inputs
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.
•
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.
Inverter with CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB