Nicklas may be on to something here. Have you entered the nameplate data from the motor into the drive?
If the drive thinks it is a 230V 50Hz motor, but it is really a 230V 200Hz motor, you have a problem. The drive will apply four times the proper voltage to the motor, which will make the motor draw a lot more current than it should. Then the drive current limit will try to prevent overcurrent by slowing down - which is why you don't get over 8Hz. Slowing down to reduce load is a perfectly reasonable thing for the drive to do, but if the problem is that the V/Hz curve is wrong, then it won't help. Can you point us at an online manual for the drive? I thougth you posted info for both the drive and the motor but I'm not seeing it when I read back in the thread. John Kasunich On Wed, Nov 26, 2014, at 04:26 PM, Viesturs Lācis wrote: > 2014-11-26 23:11 GMT+02:00 Karlsson & Wang <nicklas.karls...@karlssonwang.se>: > > A higher frequency motor will need either lower voltage or higher frequency > > otherwise it will overheat. If the 2kW motor is a 50Hz motor while the > > larger is 200kW it need a different V/F curve. > > > > Ok, thanks, I think I understood, what you mean. I will try to RTFM to > lower to voltage curve and then do some tests. > > Viesturs > ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
