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For industrial purpose the power is to be delivered for larger distance hence AC power supply is required to drive the motors. The rectifier in a VFD is used to convert incoming ac power into direct current (dc) power. There are 3 pair of rectifier combination is used for converting 3 phase AC into DC Normally 6,12 or 18 diodes will be used to serve this purpose. Rectifiers can be built using diodes, silicon controlled rectifiers (SCR), or transistors to rectify power. After the power flows through the rectifiers it is stored on a dc bus. The dc bus contains capacitors to accept power from the rectifier and stores it and finally delivers that power through the inverter section.

VFDS LLC is a leader among variable frequency drive suppliers. Our company concentrates on VFD design and VFD manufacture. VFDS LLC is china VFDS Company located in Shenzhen. Our main focus is creating the highest quality products. The main products single phase to three phase VFD, three Phases to three Phase VFD and so on.

A variable frequency drive controls alternating current torque and motor speed in electro-mechanical drive systems. In layman`s terms, it is an adjustable speed drive that regulates the frequency and voltage to the motor. You can find variable frequency drives, or VFDs, in everything from small appliances to giant compressors.

Variable frequency drive - VFDs 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.

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.

1hp 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.