After we have selected a suitable Variable-frequency Drive (VFD), we also need to consider whether we need to equip other peripheral equipment according to the actual situation of the site. The peripheral equipment selected by VFD mainly includes circuit breakers, reactors, contactors, braking resistors, etc.
1. Circuit breaker
This circuit breaker can conveniently control the power off and closing of the circuit. It is mainly used to actively block the power supply when the frequency conversion system presents reverse current, overcurrent, short circuit and undervoltage, so as to have a blocking effect and maintain the power supply.
2. Electric disturbance equipment
Reactor is a common peripheral device in frequency conversion selection. When the VFD is too far away from the motor or the VFD is too close to the power supply, in order to improve the power factor and minimize the inrush current at the input end, it is necessary to add a DC reactor or AC reactor when selecting the VFD.
3. Current contactor
Contactors are divided into input contactors and output contactors. When a part of the frequency conversion system fails, it will actively block the power supply to prevent the equipment from burning out from a distance.
4. Braking resistance
When VFD is applied to inertial loads such as CNC machine tools and elevators, the selection of VFD requires the use of braking resistors to dissipate the excess energy generated in the frequency conversion system.
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