To resolve this issue, you have to oversize the VFD to account for larger ampacities. This does raise a few problems that you have to factor in.īecause you are now concentrating the same amperage on two phases instead of three, failure of your VFD’s input diodes is likely to happen. This is done by putting the two hot wires for single phase on the AC input for the VFD and leaving one input terminal open and unused. If your motor is too large for VFDs built for phase conversion, it is possible to use a standard VFD for your single-phase power supply. These VFDs tend to be cheaper than most, but it still is a shame to throw them out if they become obsolete. Although the cost of switching the entire system to three-phase power makes it unlikely to happen very often, if it does happen then these VFDs are not able to function on a three-phase system. Both the Galt and Mitsubishi lines mentioned above only go up to 3 horsepower when set up for single-phase input, which limits the applications they can be used on.Īnother problem is if the site ever updates to three-phase power. One drawback to VFDs that are set up this way is that they typically only run smaller motors. These VFDs are rated and sized based on the output three-phase current rating of your motor, making them simple to size correctly and easier to install. If what you need is a VFD that is ready off the shelf to convert single-phase to three-phase, this is often a great option for you. (Above) Mitsubishi D700 Series Single Phase Drive, Notice the third terminal (from the left) is blocked. (Above) Galt Electric G200 Series Single Phase VFD without the 3rd input terminal. This is because the AC power input only has two available terminals for the hot wires and therefore can’t take the additional wire required for three-phase input. In fact, the VFDs that are designed this way aren’t able to input three-phase power at all. For example, the Galt G200 series and Mitsubishi D700 & E700 series all have VFDs that come from the factory ready to operate on single-phase input power and create three-phase output power to run an induction motor. Many manufacturers have lines of VFDs built to input single-phase power and output three-phase power. In this article we will dig in to VFDs that are built to convert single-phase to three-phase, how to use a regular VFD when custom VFDs are not an option, and other options for phase conversion when VFDs are not the best choice. Yes, a VFD can power a three-phase motor with a single-phase input power supply, but phase conversion introduces many considerations that normally don’t factor in to buying a VFD. Many people run in to problems with phase conversion when they get a new or used motor and find that the three-phase motor doesn’t play well with their single-phase power. There are some instances where up to 600 VAC systems are used as well. Three-phase power in the United States is typically 240 and 480 VAC systems. Three-phase supplies have three phases (L1, L2, & 元). It is common to see single-phase power for 120, 240, and occasionally 480 VAC systems. It typically will only have two phases (L1 & L2) and possibly a neutral. Single-phase AC power is common in many residential and agricultural settings, although it can also be seen in some industrial locations. Like most things, however, there is not a simple answer to this question. One of the most common calls we receive at is asking about phase conversion: Can a Variable Frequency Drive (VFD) convert my single-phase power supply to run a three-phase motor? Many who call us are looking at the ability to combine phase conversion and speed control in one device and like the potential to save money, hassle, and space. Using VFDs To Convert Single-Phase To Three-Phase
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