Variable Speed Drives

Danfoss Variable Speed Drives (also known as Frequency Inverters) can be used to speed control conventional motors by varying the frequency of the electrical supply to the motor.

Varying the speed of a motor based on the variable demand of an application can dramatically reduce energy consumption and improve the total system efficiency. Other reasons for adjusting the speed of a motor may include matching the speed, torque or power of the drive to the process requirements, reducing mechanical stress on machines, or lowering noise levels.

Danfoss Variable Speed Drives can operate as standalone devices using built in PID / PLC functionality or can be integrated into external control systems/networks such as Direct Digital Control (DDC) and Building Management Systems (BMS). They are able to receive low level interface (LLI) analogue & digital signals and common high level interface (HLI) protocols to satisfy these requirements.

Danfoss Sine-Wave Filters can be used in conjunction with Danfoss Variable Speed Drives to smooth phase-to-phase output voltage. This results in reduced acoustic noise of switching frequencies, reduced motor insulation stress and bearing currents, and allows the speed control of older motors, external rotor motors, or motors in applications where the length of the motor cables exceed standard limitations.

* Only for motors that are 415V star/240V delta, the motors are then connected in delta