Siemens SINAMICS S150 Operating Instructions Manual page 340

Functions, monitoring, and protective functions
9.4 Extended functions
Example: liquid level control
The objective here is to maintain a constant level in the container.
This is carried out by means of a variable-speed pump in conjunction with a sensor for
measuring the level.
The level is determined via an analog input (e.g. AI0 TM31) and sent to the technology
controller. The level setpoint is defined in a fixed setpoint. The resulting controlled variable is
used as the setpoint for the speed controller.
In this example, a Terminal Module (TM31) is used.
Figure 9-7
Figure 9-8
Key control parameters
• p1155 = r2294
• p2253 = r2224
• p2263 = 1
• p2264 = r4055
• p2280 = Kp
• p2285 = Tn
• p2200 = 1
340
Level control: Application
Level control: Controller structure
n_setp1 downstream of RFG [FD 3080]
Technology controller setpoint effective via fixed setpoint [FD 7950]
D component in fault signal [FD 7958]
Actual value signal X
Calculate P gain by means of optimization
Calculate integral time by means of optimization
Technology controller enabled
via AI0 of TM31 [FP 9566]
actual
Operating Instructions, 07/07, A5E00288214A
Drive converter cabinet units