[isu19151@verizo]

Thank You for your response.I have reconfigured the transformers for 230-240v input and now am thinking about adding a 3 phase line monitor as added protection for the 208v motor.According to the description it will balance the phases at 2-4-6-8 or 10 % per a selector switch.I was also thinking that it would keep the DC voltage in the drive and controller circuit within specs if the AC voltage was as it should be then DC voltage would be also.???? Any Thoughts.Jim

[awright]

I'm trying to understand what you are describing regading the 3 phase line monitor. It sounds like you believe that the monitor will influence and control the phase balance. If it is what I have seen as line monitors, I believe that what it will do is give an alarm if the phase balance exceeds the setting you have selected. It will not do anything to modify or control the phase balance.

Still a good idea, but since they are primarily intended to monitor solid three phase lines coming in from the utility, the balance of which may be influenced by the loads placed on the various phases throughout the plant, I fear that the softer and erratic phases supplied by a phase converter may give you alarms fairly regularly to the point that you ignore it or disconnect it. Have you heard from other users of phase converters that phase monitors are useful?

Don't forget that two phases are being supplied directly from the line, but the third is being artificially generated by the idler motor ond the run capacitors. That third phase is pretty squirrilly and subject to fluctuation with loading, depending upon the size and design of the phase converter.

awright

I also do not believe that a phase monitor will do anything to maintain your DC voltage at a desired level.