A frequency converter controls the motor speed by enabling the controller and setting the speed. The process is modelled in the logic layer and the zones are inserted in the system layer and the parameters are set according to the steps.
Logic layer:
The frequency converter is a device used to control an electric motor's speed. Two critical steps are required to operate the frequency converter effectively: controller enablement and speed specification. A processing step is inserted between these two steps to achieve the desired performance.
Controller enablement is the process of activating the frequency converter and enabling communication between the controller and the frequency converter. This step ensures the frequency converter is ready to receive the required control signals and act accordingly.
The speed setting is the step in which the desired speed for the electric motor is set. This can be done by selecting a specific value via a user interface or an external controller. The speed specification is crucial for setting the electric motor to the desired speed.
The processing step between the controller enable and the speed specification makes it possible to adjust various parameters and meet the desired performance requirements.
In the system layer:
Specific InOut zones effectively handle the controller enable and speed specification. An InOut zone enables the input and output of relevant signals for controlling the system. In this case, two InOut zones are required: one for the controller enable and one for the speed setting.
The InOut zone for the controller enables the controller to be activated and communication between the controller and the system. The control signals required to activate the controller and control the system accordingly are transmitted here.
The InOut zone for speed specification defines the desired speed for the system. Settings can be made via this zone to adjust the system's speed. For example, this can be done via a user interface or an external controller.
An inverted In zone is used to deactivate the controller enable. This zone ensures that the controller enablement signal is inverted so that the controller is deactivated. This way, the controller can be switched off at the desired moment.
At the same time, an inverted in-zone is also used to deactivate the speed specification. The speed setting is deactivated by inverting the signal, and the system stops.
Two Mem zones are used for the releases, one for the controller release and one for the speed setting.
The following CMZs are required for a standard frequency converter:
