https://www.automationdirect.com/drives/ac-drives (VID-DR-0003)
How to select the right AC Drive, Part 2 of 4
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three steps to selecting the right AC drive this is step one selecting the right model in order to select the right model of AC drive for your application you must determine the motor horsepower voltage and full load amperage this information can be found on the motor name plate for this scenario we are using a 1 horsepower 460 volt AC motor with a full load rating of 2.6 amps controlling a blower fan there are several application types to choose from conveyors pumps fans shop tools Material Handling HVAC mixing compressors extruders Grinders and web handling although the gs1 supports our application type it does not meet our voltage requirements of 460 volts ac since the GS2 durapulse and sj300 AC Drive models are all capable of handling our application let's look at the control modes there are three control modes available volts Hertz which is open loop control takes a speed reference from an external source and varies the voltage and frequency to control the speed of the motor sensorless Vector although similar to Voltz Hertz has internal feedback that monitors Reflections from the motor to determin speed and Clos Loop which uses encoder feedback volt Hertz will support our control mode which still leaves the GS2 Dura pulse and sj300 series as possible solutions let's look at the iio configurations of the different modules digital inputs are used to interface a AC drive with devices such as push buttons selector switches and PLC digital output signals these signals are typically used for functions such as start stop forward reverse external fault and fault reset digital outputs are used to connect the AC Drive to pilot lights alarms auxiliary relays solenoids and PLC digital input signals transistor outputs are rated for DC voltages whereas relay outputs work with both AC and DC voltages the analog input is used to interface the AC drive with an external 0 to 10vt DC or 4 to 20 milliamp signal this signal can represent a speed set point or if available PID feedback an analog output signal of 0 to 10 volts DC at 2 milliamps is available on some of the AC drives this signal is intended for use with a panel volt meter and may require a potentiometer for certain types of meters our application only requires two digital inputs one relay output and one analog input signal the keypads of the GS2 durapulse and sj300 are removable and can be remotely mounted for easy operator access and carry a nemo1 rating the durul keypad can store up to three separate drives configurations we will Mount the keypad on the drives enclosure door remote mounting requires the purchase of a keypad cable for the GS2 and durapulse drives available in 1 3 and 5 m lengths a standard UTP Category 5 ethernet cable up to 3 m in length can be used for the sj300 keypad a Serial Communications interface can be used to connect the AC drive to other devices that have the capability to function as a master the master device can control the AC drive with the serial interface instead of using the digital and analog IO the master can also use the interface to monitor the status of various AC Drive parameters such as speed current and fault status the gs1 GS2 and durapulse AC drives have a standard modbus rs485 serial interface the sj300 requires an optional s C Op e3i with a built-in serial Communications interface the gs1 GS2 urop pulse AC drives also have the capability to communicate through an optional ethernet interface by utilizing the GSE Drive interface board this board receives the ethernet connection from the master and sends out an rs485 serial modbus communication to the AC drive we'll be using ethernet to communicate with a PLC based on all the facts we have determined that the most cost-effective AC Drive series that fits our application is the GS2 AC Micro Drive we're now ready for step two selecting the proper rating
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