Variable frequency drive can be used to control the speed of a machine. There can be significant energy reduction if the machine is slowed down when it does not need to operate at full speed. For example, pumps operated so that they run at a speed dependent on the flow requirements will reduce the cavitation losses in the pump. If the pump is required to run at constant full speed, the addition of a VFD will actually waste another 5% of energy.

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Electric motors convert electrical energy into rotational mechanical energy. Motors may drive pumps, fans, compressors, or any other number of loads that may be found in a typical building. The concept seems simple, but a review of motor basics is necessary to understand how VFDs operate and also how they can destroy a motor.

When the inverter drives motor or other inductive load during stop time, generally adopts dynamic braking, means consume the kinetic energy and the magnetic energy of the motor in the coil inside through a level of energy consumption components, in order to achieve fast stop function. When the power supply is off, the inverter circuit of the variable frequency AC drive reverses connection, and conducting these surplus energy feed back to the inverter DC bus, the DC bus voltage will be increased, and when it goes up to a certain value, the braking resistor will be put into operation, so this part of the electrical energy will be consumed by heating mode, and maintaining the voltage on the DC bus to a normal value.

10hp VFD blows one of the fuses on the line side of the drive and then continues to operate on single phase supply. The fuse size that keeps blowing is a 6A fuse. This motor is a 9-lead motor which originally was wired incorrectly, which we thought was the problem, however now we have confirmed that the motor is wired correctly and it is still blowing this same phase fuse every time. I wouldn’t suspect the fuses are too small because after the fuse blows and the drive is running on single phase supply we would expect the current on the two remaining phases to increase and thus blow the other two fuses if they were marginal.

The idler motor starts and comes to speed immediately. The only three-phase I have on line is the 1hp Bridgeport and it starts right up also. I probably should not have buried my question in the middle of the post because I was just commenting about the amp draw. The question was: What does it cost to run the converter? Should I turn it off if I'm not going to be running the Bridgeport for a while or just let it run? I do like the color emphasis ability of this software.