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Pan... see Control.Com Archive: Http://www.Control.com/thread/1026232240 Regards, Phil Corso

Amin... is this a commissioning problem, or is it something new in an existing unit? Regards, Phil Corso

Kani... are you referring to an existing transformer, or one being proposed for a new project? Regards, Phil Corso

Fetian... Did the unit experience a "Loss-of-Load" event? Regards, Phil Corso

Joe E... cepsicon[at]aol[dot]com Phil

Engineer... you can buy a commercial hand-held tester, or I can send you a schematic to build one! Let me know! Phil Corso

Sounak Nandi... there is no right or wrong answer. Your question can not be properly answered unless you provide a specific goal: 1) To minimize Short-Circuit Duty? (Hardly a concern for typical switchgear capability) 2) To minimize Voltage Regulation, that is to reduce the voltage-drop...

Riaz... the location of UV-relay(s) is (are) not clear. Are there two, one on each incomer feeding the ATS? Or is there only one, connected to the output to the pump? Regards, Phil Corso

Engineer... further to my earlier post about Y-connected motors being more susceptible to problems, see: http://www.control.com/thread/1325318215 Regards, Phil

Engineer... I ask again, "How does the problem manifest itself?" Phil

Engineer… First, your test question: I presume it was one of conjecture! What would, should, could happen if...? But, conjecture alone is meaningless without detail. For example, how does the problem manifest itself? How do you know the VFD is OK? Why test the motor alone without first...

Engineer... looks like you misunderstood me. If the connection,when connected to the VFD, is a Star, then test it with the same connection. But, if I misunderstood you and you want to know the what connection to use to achieve the highest reliability, then that's another story.

Engineer... use the connection being used when it is connected to the VFD! Regards, Phil Corso

Sayan... the following archived Control.Com threads contain formulas you can use. One of them also discusses using slip-measurement: http://www.control.com/thread/1026163908 http://www.control.com/thread/1026164342 http://www.control.com/thread/1026185658 Regards, Phil Corso...

Sayan... measure its temperature-rise above ambient. Then compute its output power, kWout, which will be proportional to temp-rise divided by its rated-rise over a specified ambient, say 40 Deg C! Finally, divide kWout by the input power you already have, kWin. A second method to...

Santanu... while you may have ruled out a short-circuited rotor-windng, there is always concern about slot-wedge dislodgement. Have you any noticed measurements of the coolant temperature that could point to rotor damage? Regards, Phil Corso

AK... can you provide the 3 phase-to-phase voltages as well as the 3 line-currents? Also you might want o substitute a fan made of alumininum, for the plasic fans! Regards, Phil Corso

Kbob... the 240Vac source, represents only a 5% over-voltage above typical design values! The motor, when connected in delta should tolerate it! More significant, however, is your observation about the contactor "clanging!" It suggests a starter problem. How is the motor started, DOL...

Andrew... are the units in question equipped with braking modules? Regards, Phil Corso ([email protected])

Neeraj Bathija... The L.M. Photonics Website has Step-Resistance Calculator for WIRM applications! Regards, Phil Corso