I think you have 3 phase and a Neutral there 1 phase + neutral = 240Vac 1 phase + 1 phase = 400 Vac Accepting some fluctuation between the phase and some measurement fault, will explain the 422Vac.
As far as I can see from here in Belgium, there is a phase failure problem. Giedo Belgium -----Oorspronkelijk bericht----- Van: [email protected] [mailto:[email protected]] Namens Matthew J. Willis Verzonden: 2009-08-26 17:59 Aan: [email protected] Onderwerp: 3 from 1 I need some education of Phase Converters. A 300 gpm Fire Pump (Tank fed), is supplied by one of these things. Single phase only is available, so one of these has been installed to make it work. Installed in '06-07ish, just replaced main board in controller. I was there to do test following part replace. 240vac, dropped to 106-108 across the 3 as indicated on panel. Middle leg showed 422vac in event log, as high peak. When started, pump shaft (vertical) jumped up and down repeatedly. We red tagged it and are waiting on word from electricians. Pump Motor checked out fine. I know they are not allowed, but it was approved, so., I just test it. R/ Matt Matthew J. Willis, CET Automatic Fire Sprinklers Norred Fire Systems L.L.C. 318-387-1134 Voice 318-387-1163 Facsimile [email protected] _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
