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 nameplate for this scenario we are using a one horsepower 460 volt AC motor with a full load rating of two point six 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 GS 2 dura pulse and SJ 300 a C 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 the speed reference from an external source in various voltage and frequency to control the speed of the motor sensorless vector although similar to volts Hertz has internal feedback that monitors reflections from the motor to determine speed and closed loop which uses encoder feedback volts Hertz will support our control mode which still leaves the GS 2 dura Paulsen s J 300 series as possible solutions let's look at the i/o 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 the see voltages the analog input is used to interface the AC drive with an external at zero to 10 volt 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 voltmeter and may require a potentiometer for certain types of meters our application only requires 2 digital inputs 1 relay output and 1 analog input signal the keypads of the GS 2 dura pulse and SJ 300 are removable and can be remotely mounted for easy operator access and carry a NEMA 1 rating the dura pulse keypad can store up to 3 separate drives configurations we will mount the keypad on the drives enclosure door remote mounting requires the purchase of a keypad cable for the GS 2 Endura pulse drives available in 1 3 & 5 meter lengths a standard UTP category-five Ethernet cable up to 3 meters in length can be used for the SJ 300 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 i/o the master can also use the interface to monitor the status of various AC drive parameters such as speed current and fault status the g s1 g s2 indoor pulse AC drives have a standard Modbus rs-485 serial interface the SJ 300 requires an optional Scop III i with a built-in serial communications interface the g s1 g s2 indoor 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 rs-485 serial Modbus communication to the AC Drive will be using Ethernet 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 GS to AC micro drive we're now ready for step 2 selecting the proper rating
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