The bypass contactor depending on the phase could be used to reverse the rotation of the motor depending on the controller in charge of the isolation contactor on the VFD output.Water pump motor...and its running backwards.
The bypass contactor depending on the phase could be used to reverse the rotation of the motor depending on the controller in charge of the isolation contactor on the VFD output.Water pump motor...and its running backwards.
I wouldn’t do that. Not sure if it’s ever ok.
The bypass contactor depending on the phase could be used to reverse the rotation of the motor depending on the controller in charge of the isolation contactor on the VFD output.
You lose efficiency. A 5 hp motor will not produce 5 hp through an inverter or rotary converter. but some equipment designed for 3 phase needs to run on it for control reasons. A person could do a complete controls, motor upgrade but it would likely cost more than buying an inverter.Do you lose the efficiency? Would it make more sense to swap the motor?
Yes, there are several possibilities. My example would be for the VFD to drive a conveyor at a controlled speed to meter the material on the conveyor, while the controller in charge of the entire system may have a safety built in to prevent a jam or stall by opening the isolating contactor and closing the bypass contactor with phases reversed to provide an automatic reversal of the conveyor belt. The controller in charge would have a timer that would only back up the conveyor belt for a pre-determined length of time then open both the isolation contactor and the main contactor to shut everything down, waiting on an operator reset.Changing the incoming wires to the drive will change both the drive contactor and the bypass contactor. Changing just the leaving on the drive contactor will still have the motor running the wrong way on the bypass or vise-versa. (Probably should have went more in-depth with the question)
Yes, there are several possibilities. My example would be for the VFD to drive a conveyor at a controlled speed to meter the material on the conveyor, while the controller in charge of the entire system may have a safety built in to prevent a jam or stall by opening the isolating contactor and closing the bypass contactor with phases reversed to provide an automatic reversal of the conveyor belt. The controller in charge would have a timer that would only back up the conveyor belt for a pre-determined length of time then open both the isolation contactor and the main contactor to shut everything down, waiting on an operator reset.
Would be cheaper to replace the motor.You and me both... Local electricians won't even call me back about 3phase in residential. I need it in my shop to run a 70 year old 14" tablesaw
You would need to have three phase brought to the house via transmission lines which would be different and separate from the single phase you already have. Terribly expensive for a residential installation.
You can run 3 phase equipment a couple of ways from 230v residential power by using a VFD (variable frequency drive), an inverter, or a rotary phase converter.
By controlling generator speed. A 2 pole generator requires 3600 rpm to generate 60 hz. A 4 pole generator requires half that speed.With multiple power plants located at different distances around the country all tied into the "grid" how do they keep them all in phase?
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