Recent content by Farkel

Trying to locate fast acting contactors size 1 through 6, open type with 230VAC coil

I would select a vector drive, rather than a volt/Hz. drive to replace the DC Drive, and would watch the breakaway torque as previously mentioned.

In the U.S.A. NEMA MG-1 defines the Efficiencys that motors need to meet EPACT. Any efficiencys above EPACT are considered Premium Efficiencys, due to better green steel laminations in the stator core, and rotor cage, smaller air gap between the two, use of AFBMA bearings, copper windings, and...

NEMA MG-1 describes what an Open and TEFC motor Service factor by definition is, eg. ODP is 1.15S.F., and a TEFC is 1.0S.F.; however, many manufacturers make a 1.15S.F. TEFC motor. The motor can produce the 15% more horsepower using the service factor area of increased amperage, heat, and...

Why not use the regenerative drive, and share a common DC bus, and there by save energy on both drive systems. The savings perhaps would pay for the increased costs of the drive vs using dynamic braking. Also, U.S. Drives out of Niagara Falls N.Y. makes such an animal. See www.usdrivesinc.com.

What is the application? Otherwise, what Division, Class and Group of Explosion Proof motor do you need? And is it made in an electrical motor or an air motor?

Maybe, just maybe the slip rings feed some other device as a secondary circuit like in a transformer.

Premium could be any value over that of EPACT.

Your reactors have current lag, whereas the capacitors in the VFD's lead. So you limit the inrush with the reactors, so the fuses don't blow.

U.S. Drives in Niagara Falls, N.Y. makes units up to 3500HP, which use step down and step up transformers. See their white paper on the subject by going to www.usdrivesinc.com. Regards,

Reuland makes such an animal, and they are found in California. Regards,

Suggest a closed loop vector drive, where you could control the cut to length, and the speed, plus torque.

Oh I forgot about the lights. There should be three of them lit, and that is a good thing, for it tells you have all three phases of power coming in.

IEEE841 only covers low voltage and it is a TEFC servere duty cast iron motor. The spec covers inverter duty, so maybe your medium voltage motor that the customer is after, he wants as inverter duty. WPII is an open motor with screens, so I would peg him down as to his exact requirements and...

The dial multiplier is equal to the reading times the transformer factor, which comprises the potential transformer ratio times the current transformer ratio. The 288 multiplier figure would be for the potential transformers going from 288 volts to 120volts, for you have a 480/277 volt circuit...