The converter output voltages are all about equal (230-235 volts) but the pump draws 13 amps on L1 & L2 and 7 amps on L3, which is the "manufactured" phase.
Definitely looks like a Capacitive Reactance Tweek is needed here!
I bet the 22µF Capacitor brings the load levels on L1 and L2 down to the 10 - 11 Amps range, and the "Pseudo-Phase" L3 may drift around the 8 - 9 Amp level, which would mean it might actually start doing some work!!!
As it is now, only L1 and L2 are doing any work - L3 is kind of slacking off (insufficient KVA available).
With additional XC (Capacitive Reactance), the "Pseudo Phase" L3 can contribute more work, therefore bringing the polyphase loads more into a balance.
Just do not expect a completely balanced load value here!
The polyphase motor is being driven more from 1 phase apparent power, than polyphase apparent power.
The "Pseudo Phase" L3 does not follow the same power curves & all that silly E-lecktricul Injunearring type stuff, as the lines derived from the Transformer - and the real disappointing thing: they are still only a Single Phase!
This setup really should have been specified to use a 1 Phase 3 or 5 HP Motor - a Capacitor Start-Run type would have been a good choice too!
I realize the design and ordering of the pump equipment was in the hands of others, so maybe some "constructive critsism" should be delivered to the specifying party(s).
Something like:
"I feel sorry for that poor Motor, being subjected to that crappy power quality from the Phase Converter"
Scott35