ATO 3 hp 2.2kW 10A VFD, Single Phase 120V Input, 1phase/3phase 220V Output Variable Frequency Drive Motor Control

Tips: Choose a VFD base on motor rated current

When a motor power is stated, it is always the mechanical power, shaft power i.e. NOT the input electrical power. Variable frequency drives (VFD) are also (mostly) rated in terms of kW albeit it's wrong. Because VFD output is electrical (not mechanical). Mechanical power (i.e. motor shaft power) is always "active" power, where in electricity we also have reactive (doing nothing but losses) power. The apparent (total) power (stated in terms of kVA) is vectorial sum of active and reactive power components. For all those facts above, ATO highly recommend to select a VFD by matching motor current. This is the right way. Despite mathematically correct, we wouldn't select a VFD for partial load of motor. We would simply go for motor nominal (rated) current.

Finally the answer is: choose a VFD output current ? motor rated current.

Control mode: V/F control; vector controlCommunication? Offer RS485 communication interface, support MODBUS-RTU communication protocolInterior PID controller: Be convenient to make closed-loop systemAutomatic energy save running: Optimize V/F curve automatically based on the load to realize power save runningAutomatic voltage regulation (AVR): Can keep constant output voltage when power source voltage varies.Automatic current limiting: Limit running current automatically to avoid frequent over-current which will cause trip1* Variable Frequency Drive1*User manual