240volt motor 3 phase

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Meisenburg

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Hey guys have a 240 volt 3 phase motor. My commercial power into building is 208. Should I be fine with 208 or should I install a transformer???? Second question this is a sewer lift station. Are vfd is giving us a low voltage code stopping the motor because are main power into building is 208 but we're only getting 200volts. So I was thinking of installing and three phase transformer to get 240 and be done with it. Will this solve my problem.. thanks
 
If the VFD is programmed to look for and put out 230V, that's the problem. You can add a buck-boost transformer, but you can also just reprogram the drive to tell it you have a 208V supply and motor. The motor will run at higher than normal current, but in a submersible (assuming it is on a lift station) that shouldn't cause any significant loss of service life. It will only make a difference at full speed, and that is usually for short durations on lift stations.
 
<<have a 240 volt 3 phase motor. My commercial power into building is 208. Should I be fine with 208 or should I install a transformer?>>... I'd say you need a step-up transformer with a suitable power matching your requirements, otherwise the motor would be subjected to overheating, and this in turn causes a deterioration in its insulation in the long run..
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Hope this helps!!

Ali
 
You could install a buck-boost, or reprogram the VFD per jraef. Or get a 208V motor. Or, if there are xfmrs feeding that panel, lower the primary taps to overdrive the secondary side (could be dicey depending on what other loads originate from that panel).

A lift station pump could run considerable amounts of time during rainstorms, even w/o a combined sewer system (I/I is the devil). Whatever solution you choose, make sure the pump is capable of continuous operation. Does that pump station have generator back-up as well?
 
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