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*Eng-Tips's functionality depends on members receiving e-mail. 99% of modern VFDs now on the market provide a feature called Sensorless Vector Control and although that feature lacks official definition and can be done in many not so honest ways, even the cheapest of them require very accurate current measurement inside of the VFD to make it happen, and it's a very simple internal process to place that information in reach to the user either through a prorrammable analog output, or via a communications port like Ethernet or some other Field Bus protocol. Ha-ha, that made me chuckle. Current THD will be much lower. Then the unreasonable requirement becomes legally binding in the contract. We are measuring the current at the input of the VFD, so it is not an issue of trying to measure the output side currents. Could you please give some more details on the output specifications of the VFD?
Open circuit CTs are VERY dangerous. Rapidly explore innovative design options to reduce development time and expense, all within the Creo design environment. For something a little more 'industrial' and ready-mounted -. With Creo 7.0, you will be able to design the most innovative products faster than ever before, keeping you on the cutting edge of product design and ahead of your competition. And, we're trying to tell you that, specifically, that is bad idea that will be not very accurate. kcress - http://www.flaminsystems.com, "I have not failed. Settings, 1995 - 2020 Analog Devices, Inc. All Rights Reserved.
Thomas Alva Edison (1847-1931). On the input side we would probably see the opposite. See how the Generative Topology Optimization extension automatically delivers high-quality, lower-cost, manufacturable designs. Both of these are used only on very large machines like more than 1000 hp. Join your peers on the Internet's largest technical engineering professional community.It's easy to join and it's free.
You might try slowing it down to under 4 khz to see if that helps. I have tried all mitigation techniques normally associated with typical VFD failures. Click Here to join Eng-Tips and talk with other members! I think the file format is correct (because the extension is .doc), but I get an error message: Thanks for posting that Aditya. At 400V 50Hz the OP is likely closer to your world than mine... That sounds like a pretty good way forward. The VFD may also be able to provide a signal that is proportional to torque. I have installed load reactors at the VFD output to attenuate the fast voltage rise times seen with PWM VFDs. events? Promoting, selling, recruiting, coursework and thesis posting is forbidden. Close this window and log in. to mobile view, Analog Most of the drives I've taken apart actually have LEM transducers in them so I suspect they may have gotten them sorted Scotty. Interested in the latest news and articles about ADI products, design tools, training and When the blower is operating at its low speed, we seem to be measuring the current correctly and these measurements correspond pretty well with other metering equipment. Already a member? Room, Quality
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