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Huanyang Vfd Programming Explained3/22/2021
For example, a fan needs less torque when running at 50 speed than it does when running at full speed.
Huanyang Vfd Programming Explained Upgrade To APlease upgrade to a newer version or try a different browser.However, below are some helpful tips and suggestions to help you select the right drive.Hopefully, the mystery becomes less complex as you understand what your application needs are. The Big Picture Before you get too far into the process of looking at VFDs, it is a good idea to gather the basic motor and system information that will help you in selecting the proper VFD. Huanyang Vfd Programming Explained Full Load AmpsMost of this information can be found on your motor nameplate such as: Horsepower Full Load Amps (FLA) Voltage RPM Service Factor It is also helpful to know if the motor is inverter duty rated Other information will be specific to the needs of your system and application such as: Type of Load (Constant Torque or Variable Torque) Speed Range and Control Method Special Enclosure Needs Some of this information may seem silly to look for; however, by gathering more information now, it will be easier to find and compare different drives and ultimately easier to pick the best Variable Frequency Drive for your needs. Now that you have that information, it is time to look at some of the important specifications on each drive that will assist you in deciding what will work best for you. Horsepower (HP) Although it is important to size the VFD with the FLA of the motor(s) being controlled, knowing the horsepower of the load is a great way to search for drives that may fit your application to be further narrowed down by other variables. Full Load Amps (FLA) This is perhaps one of the most critical pieces of information to gather. Using the FLA rather than horsepower ratings is the proper way to size a VFD. You will want to compare the FLA of the motor with the amp ratings of each VFD you are considering. This is an area in which being conservative pays off and you will want to give your application a little bit of a cushion with matching the amp rating. This is especially important if you have a constant torque load or a load that is difficult to get started. Although it may cost slightly more to purchase a drive with a higher amp rating in the beginning, it will likely pay off over time in reliability and functionality. It is crucial to match the voltage of the VFD and motor to your available voltage on site. For the US low voltage application, this is usually either 208 VAC, 230240 VAC, or 460480 VAC. For medium voltage or other applications it would be a good idea to call into one of our application specialists or engineers to assist you in establishing your needs. ![]() If the load is 3 HP (roughly a 230 VAC motor with an FLA below 10 amps) or below it is likely that we have a drive built for single phase input in stock for you to hook up and run with. If your needs are greater than 3 HP, then it is possible to use a drive built for three phase input, however the drive must be properly sized for your application. This is because the diode bridge is meant to carry current through all three legs. Thus, the rule of thumb for sizing the single phase input on a three-phase drive is to use a VFD rated for 2 times the FLA of the motor. For example if your motor is a 10 HP motor with a FLA of 28 amps, then you would need to select a VFD with an amp rating of 56 amps which ends up being around 20 HP. In addition, if continuous operation is a must, then the following should be specified: - 10 voltage fluctuation - 3 frequency variation Type of Load (Constant Torque or Variable Torque) Does your variable frequency drive application require a variable torque or constant torque drive If the equipment being driven is centrifugal, such as a fan or pump, then a variable torque drive will be more appropriate. ![]()
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