Operating instructions

Functions, monitoring, and protective functions
9.4 Extended functions
Drive converter cabinet units
Operating Instructions, 10/2008, A5E00288214A
343
If a PID controller has to be used for control reasons, the D component is switched to the
setpoint/actual value difference (p2263 = 1) unlike in the factory setting. This is always
necessary when the D component is to be effective, even if the reference variable changes.
The D component can only be activated when p2274 > 0.
Note
With the entry "0" sec. as power up time or ramp-down time for the ramp function generator
of the technology controller, the current values of the respective ramp function generator will
be frozen.
Commissioning
The "technology controller" function module can be activated by running the commissioning
Wizard. Parameter r0108.16 indicates whether the function module has been activated.
Function diagram
FD 7950 Technology controller – fixed values
FD 7954 Technology controller – motorized potentiometer
FD 7958 Technology controller – closed-loop controller
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.