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DickDV, great job to summarize our efforts in this endless post! Thanks, NNG.

On main questions from this forum: “…In the water and wastewater treatment world, we encounter some owners (and consultants) who want to establish specific requirements for AFDs based on hp size.” My opinion in general without harmonic study: 1. 1 HP up to 10HP 6 p VFD (Individual) & 6p VFD + DC...

I support Jraef’s views for generalization with harmonic mitigation on drive’s applications in industries. It’s up to customer to choose their applicable drive configuration (cost, size, and manufacturer). As many drive’s manufacturers (ABB, AB, SquireD and etc.) offer now a preliminary harmonic...

Dear Iceman, You are correct. Our tests were done on generic Passive Harmonic Filters including a Lineator. All of those filters have the same components as L & C but their design arrangement was different. The notes (1 & 2) from the test report in Australia have a valid information regarding a...

Dear Iceman, Why you try to convince me that I am against Matrix and Lineator filters using for drive applications from my view point? I am the same as you as end-user of those products and make my own comments. Those filters are a chip and simple product and should be used by engineers as they...

Dear Iceman, No doubt that those filters are the simplest and affordable topologies but we have a right question about them: Performance of Matrix Harmonic Filters - for the eyes of Drive Experts As a passive harmonic filters the “Lineator” and “Matrix” have a similar configuration called a...

Thank you, ScottyUK. Your reference book is a good help! The standard abbreviation seems easy for their users in UK but for others as in US it is a puzzle. Sincerely, NNG

Hy everyone, please, help with reference regarding the new codes for transformers such as DD and DY and so on. Those codes show the major configuration, phase-shift and grounding on Transformers. Thanks, NNG.

Hi WheelerTI, here is additional info for your comparison Drive Isolation phase-shifting XFMR vs Passive Harmonic Filters: 1. Shorts on filters: a)they have a leading power factor when they unloaded, b)the presence of the Cap Bank boosts the input voltage of the Drive when the Drive in stand-by...

Hi Shenyee, you have to convert your *.csv file first. To make it easy follow by these steps: 1. Open your *.csv file in Excel (MS office program). 2. On top of spreadsheet you will see in first 2 colomns designation for your measured data [DB].Data.Waveforms.CH 1 S Volts -0.02048 0 -0.020476 0...

Hi Shenyee, looks you can do it with your scope TDS3054B because I've checked one of the scopes in our lab - TDS3014B. It has the same functions as yours and it's from the same Tektronix family: TDS3000. Here is what you want to do: 1- Select the Ch.(Voltage or Current) on your scope, 2- Push...

Hi, Shenyee. I have checked the Tektronix site for information about hard copy capabilty (saving the data in *.CSV format)on your scope TDS3054B and could find any reference to this option, call to Tekt-x for support or otherwise: 1- try to look through the scope menu ("Save/Recall&quot...

Please, take 4 steps: 1- load a free software "Top-the output process" from electrotec web site: http://www.pqsoft.com/top/ 2- save the current or voltage waveforms on your scope in *.CSV format file 3- open this file in above application "Top-process..." 4- you will be...

Thanks, JBartos and cuky2000, for your references. It was a good insight about this terminology.

Here is my problem; "The Customer spec calls for Harmonic Analysis of input current for operation at 50%, 75%, 100% output current at 60Hz and 5% commutating reactance". With the first part of this item is not a problem, but the second part "5% commutating reactance" is odd...

Please, I need clear explanation of this term : "commutating reactance". I've walked through some sources but could not fine a good one. Thanks.

I've to add just in Jraef's comments. The 1336 AB Drives have a different Front-Ends, depending on size: Low HP with Diode Bridges and the Pre-Charge with SCR, while High HP with SCR Bridges and Pre-charge Control, so it's mean that Jraif's idea about pre-charging DC Bus works correctly. They...