Hello all! I started this post to discuss the specific experience "By users only please" That are useing Rotary Phase Converters in their shops to run Fadal (Newer Taiwan Built Machines)or any other manufacturer as well. I just installed a Northern Power PL30_30HP RPC in my shop to power a 2015 Fadal (Taiwan Built Series 1) I am running the RPC off od 240 volt single pahase residential power (200 amp service) On the output of the RPC I am getting between 240 to 255 volt 3 phase power. Machine requirement is between 208-235 Volt max. Because I was told by many CNC techs I could eventually burn out my Syntec spindle drive @ $5k (or even my Yaskawa axis drives)I decided to play it safe and now have set up a 240 to 208 step down 30KVa isolation transformer with "Taps" to adjust the range of power out out for my needs. Dadal 4020B VMC has a 23 KVa requirement as I have the high Torgue spinslr motor option.
It seems no matter what I tried there is approximately a 15 volt variance from the 3 legs coming out of the RPC. My understanding is the at the "Manufactured leg" by the RPC is the higher voltage leg and the RPC engineer from Northern Phase Converters is telling me that when the converter is under load from the machining that higher voltage will drop down closer to the others. My ? to all of you with a RPC experience what have you seen with your output voltages measuring "Leg to Leg" on your Three Phases? Such as T1-T2= T1-T3= T2-T3= Again I get around a 15 volt variance (unloaded). American Rotary claims to be closer to all 3 phases with their digital control. It would be nice to hear back from all you RPC users out there. It would be great to compare the numbers unloaded and then voltage measured under machine load. Thanks for all your input thus far!
It seems no matter what I tried there is approximately a 15 volt variance from the 3 legs coming out of the RPC. My understanding is the at the "Manufactured leg" by the RPC is the higher voltage leg and the RPC engineer from Northern Phase Converters is telling me that when the converter is under load from the machining that higher voltage will drop down closer to the others. My ? to all of you with a RPC experience what have you seen with your output voltages measuring "Leg to Leg" on your Three Phases? Such as T1-T2= T1-T3= T2-T3= Again I get around a 15 volt variance (unloaded). American Rotary claims to be closer to all 3 phases with their digital control. It would be nice to hear back from all you RPC users out there. It would be great to compare the numbers unloaded and then voltage measured under machine load. Thanks for all your input thus far!