Frequency inverter

Drive control & motor control systems

In the areas of power electronics and drive technology, we offer small, compact frequency converters for your individual application. Below you will find some completed development projects. For you we also design customized frequency inverters according to your individual requirements.

Safety Frequency converter control

Performance Level e certified control with frequency inverter

The project goal was the development and production of a frequency converter-based machine control. In order to enable its use in machines that pose a danger to people, the core requirement was to achieve safety level PL e. As soon as a hazardous area protection, such as a light barrier, is interrupted, the motor control must be stopped. In this case, the objective was for the motor to rotate in the opposite direction in order to be able to free a trapped person, for example. Two CPU’s and a special algorithm, combined with monitoring methods, realize these requirements and make it possible to reach the highest safety level! For a worldwide use there are assembly variants for the 230V or 110V voltage network. Tolerances also cover the use in other networks, such as Japan (100V). Pushbuttons, light barriers, temperature sensors can be connected and evaluated directly on the board. For extended operation, the machine control communicates with an external HMI. The connection option to an edge controller and the KNESTEL cloud platform is pioneering.

 

Facts &
Highlights

areas of application

areas of application

Compact mini fc with phase detection

The project objective was the development and production of a frequency innverter for the drive unit of a ventilation flap control system.
The drive train consists of the FI and an asynchronous machine (ASM) without rotor position feedback.
The electronics are located in a modified “terminal box” of the motor. The direction of rotation is determined by which terminal the mains voltage is applied to ensure downward compatibility with previous types.
The end position detection is carried out by external mechanical or electronic limit switches, which can be connected directly to the frequency inverter.
Furthermore, a digital input is available for a fast run function. A programming interface is provided for software updates, via which the logic section of the frequency inverter can alternatively be supplied with voltage without the power section being active.

frequency converter, customized electronics

Facts &
Highlights

areas of application

areas of application

KNESTEL resistance control

The project objective was the highly dynamic torque control of a permanently excited synchronous motor in fitness equipment for circuit training (e.g. rowing, back trainer, etc.).
The frequency inverter is equipped with a CAN-BUS interface, a STO function (Safe Torque Off), an onboard 24 V/3 A switching power supply for supplying external electronics and also offers the possibility of connecting a braking resistor.

Frequenzumrichter, kundenspezifische Elektronik

Facts &
Highlights

areas of application

areas of application

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