An Introduction to Variable Frequency Drives

Here at Europa Components, we’ve created a video tutorial and accompanying written guide introducing variable frequency drives. In this tutorial, we’re exploring our three-phase variable frequency drive product range, available in two formats: the basic format of the unit-only VFD, and the machine install-ready format versions, where the VFDs are housed in a lockable IP55 steel enclosure, and unit operation is via start and stop buttons on the enclosure door.

Apart from the drive already having protection against overcurrent, overload and under and over-voltage, the three-phase input is connected to the drive via an MCB, and the enclosure is also thermostatically controlled with fan cooling when required. Connection of the motor is a simple matter of connecting the cables to the din rail terminals mounted next to the MCB.

In the video above, we’re using our FR 200 7.5kw version, and this unit already contains the basic set up program, so we just need to insert the motor parameters.

Note that, in this configuration, the master speed controller is the potentiometer on the keypad. On the motor, you will find the information you need to complete the program on the legend plate. In this case:

Three-phase

• kW rating
• Rated motor voltage
• Motor torque requirement
• Constant for motor
• Variable for fan or pump

Enter the motor parameters on the keypad. These can be found under step F08.01 for phase, kW and voltage, plus F00.03 for torque. Pressing the Start button on the enclosure front panel connects the power to the motor, which will speed up over a pre-set time. Also, adjusting the potentiometer on the keypad will vary the speed of the motor up or down.

If a fault condition occurs, the drive will stop and the front panel Error will illuminate. The unit can then be reset and restarted using the Stop, Reset and Start buttons. Our compact flash drive will copy and save the programmed parameters for transfer to other drives, quickly and efficiently. See the datasheet or instruction manual for further details.