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  1. amptramp

    Why not Ethernet vs. RS-485?

    I'm not sure I agree with the "proprietary" part of the comment "Ethernet IP used in Allen Bradley processors is a propritary "language"." At one time, this statement may have been true; however, today Ethernet/IP is an open standard (this does not mean the specification is free) managed by ODVA...
  2. amptramp

    NEC or IEC Standards and Indicator Lights

    Hello all, I am investigating the application of a "power on" indicator lamp for machine control. I am interested in any code references in any standard that explicity discusses the application. Specifically: 1) Is a "power on" indicator light required for machine control? 2) Is a "power...
  3. amptramp

    EU, UK Distribution Systems TT or TN

    Thanks Gunnar! I appreciate the detail. amp
  4. amptramp

    NFPA 79

    Fundamentally NFPA standards including NFPA 79 are national in scope. The interpretation of the standard does not depend on the locale - the code is the code and the intent is the intent; however, jurisdictions may modify the standards (typically by adding regulation) at their discretion. This...
  5. amptramp

    EU, UK Distribution Systems TT or TN

    Cheers All, Please forgive my lack of world travel! Is 230V 1[Φ] the most common distribution system for commercial/residential applications within the EU and UK? What is the prevalence of type TN and TT distribution systems in the EU and UK with respect to industrial, commercial, and...
  6. amptramp

    Multiple VFD's on Single Iso Transformer w/ GFCI

    Thanks for all the comments so far. Don't quit on me yet though. How about the multiple VFD's on one isolation transformer and related questions? Also, another aspect of the machine installation is the hatchery often has GFCI (RCD) protection for the receptacle powering the machine, so it is...
  7. amptramp

    Multiple VFD's on Single Iso Transformer w/ GFCI

    Also, the machines are portable and are plug and cord connected.
  8. amptramp

    Multiple VFD's on Single Iso Transformer w/ GFCI

    The machines serve both markets (US and Europe) and as such a one size fits all design is being implemented. It is possible the GFCI tripping issue is in the US only. The history of the machines is new for me. The machines are used in hatcheries. I find it interesting that RCD's in Europe trip...
  9. amptramp

    Multiple VFD's on Single Iso Transformer w/ GFCI

    [b]DickDV:{/b] My thoughts exactly on the carrier frequency. However, a Fluke 360 Leakage Current Clamp was used to measure the current in the PE (ground) conductor at the different carrier frequencies. At the high carrier freq, the current in the PE (ground) conductor decreased! I don't quite...
  10. amptramp

    Multiple VFD's on Single Iso Transformer w/ GFCI

    Hello all, The application consists of four 1/2HP 115V 1[Φ] In / 230V 3[Φ] Out VFD's powering 1/2HP gearmotors that drive simple conveyors. The conveyors are dual narrow urethane V-belts riding on steel guides carrying egg flats. The VFD's will be loaded at approximately 75%. The...
  11. amptramp

    belt driven fan alignment

    Synchronous (Timing) belts require proper "engineering" for a successful installation. For example, some belt manufacturer's offerings such as the Gates PowerGrip GT2 have proprietary tooth profiles requiring matched pulleys. The Gates website has "design manuals" available for download. The...
  12. amptramp

    Thoughts on "SmartGrid" Implementation

    The following article briefly discusses smart grid security and mentions a NIST document that is highly relevant to the security discussion. The article: http://electronicdesign.com/article/power/smart_grid_design_opportunities_extend_from_the_meter_to_the_mercantile_exchange.aspx The NIST...
  13. amptramp

    Phase loss on a lightly loaded motor

    I have seen a small knitting plant (6 - 8 machines) being supplied by a phase converter (can't remember if it was static or rotary) keep running when the entire plant was single phased (due to a failure in the wiring to the phase converter). All the machines kept running until the machine with...
  14. amptramp

    Transformer manufacturer

    Yes, thanks everyone for the enlightening discussion, and especially to rbulsara and prc. The information presented has diminished my cynicism as usually happens when factual information testifies against hearsay anecdotal evidence (I am assuming everyone is being truthful). Also, I regret my...
  15. amptramp

    smoke puff out of 13.2kv motor, but no trip

    pete: Thanks for the info.
  16. amptramp

    smoke puff out of 13.2kv motor, but no trip

    pete: Forgive my ignorance, but what procedure is indicated by "Cracking performed to bring core hotspots in spec." Thanks, amp.
  17. amptramp

    Transformer manufacturer

    Thank you, Rafiq. I would tend to agree; however, are Crompton-Greaves, Siemens, and L&T examples of companies whose mothership is in India? Do you know of examples of "first world" companies that produce inferior products because they are "Made in India"? Some familiar with my rants will...
  18. amptramp

    Transformer manufacturer

    Muthu: Are you saying quality from Indian manufacturers is "third world". I find this interesting since you are obviously in India, and would seemingly present an unbiased opinion.
  19. amptramp

    Thoughts on "SmartGrid" Implementation

    In a manner similar to Richard Feynman's famous rubber band experiment, maybe a wifi setup being blitzed by a bluetooth enabled cellphone might have some impact on the IT guy and all the non-technical bean counters involved in the decision making process.
  20. amptramp

    Thoughts on "SmartGrid" Implementation

    Only Pringles cans that come with a set of instructions (found in the Anarchist's Cookbook)... But seriously, shouldn't RF Denial of Service be considered as a viable security risk. I found the info at the link below interesting...

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