When we ran the generator we connected the 3 hots as usual and I don't recall if we grounded it or not. I only had 3 connectors large enough for the leads coming out of the generator so I'm sure we didn't connect the ground to the neutral of the generator.
http://cache.automation.siemens.com/dnl_iis/DA/DA0NDQzAAAA_59401543_HB/PJU_0212_en.pdf In that manual after a fault I have 4 status LED's lit up. On page 6-143 the bottom 4 LED's are lit. Which one caused the fault I can't tell. The machine schematic does not show a neutral connected at the stepup transformer and the infeed unit doesn't even have a neutral connection and neither does the machine. From the tone of the tech's voice he hears this problem a lot with 611 drive and rotary phase converters. John On 5/30/2012 1:12 PM, Jon Elson wrote: > John Thornton wrote: >> I just got off the phone with Siemens tech support and "Our systems >> don't run well on phase converters." > Well, given the way this system works, I'm not surprised by his comment. > But, it is fairly close. You need to get into it and see WHICH trip it is > getting. There probably are several different sensing circuits > (over-voltage, > under-voltage, lost phase, etc.) and knowing which one is the source of the > trip should be VERY helpful. Right now you are flying blind, not > knowing whether > it needs more or less voltage, etc. >> was the main theme of the >> conversation as well as we can't run on a Delta system because we need >> the ground reference I think he said. >> > But, does the machine bring out the neutral? I think you said it does > not, so > his comment does not make sense. Well, given the way this system works, I'm > not surprised by >> Additionally he suggested a Delta to WYE step up transformer with >> grounded secondaries between the RPC and the 611 > Well, if there's no neutral brought out, that doesn't make sense. If it > is SUPPOSED > to have the neutral connected, and the wire has been removed when it was > supposed to be connected, then suddenly, a LOT of things start to make > sense. > > If it needs a neutral connection, it may be possible to connect it to a > balance > transformer, which is three windings on one core, with all the wires at one > end connected together as the neutral. > > When you used the Diesel generator, did you hook the neutral to something? > You said you used the 208 V taps, was this generator a 120-208 Wye > unit? If it worked fine on the Diesel with NO neutral connection, then > this has no bearing on the problem. If you DID hook the neutral to > something in the machine, then this may be the most important piece of > data. > > Jon > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
