Out out voltage of 3 phase inverter

looking at the nameplate,


I think 380-420V from 50Hz


or 440-480 from 60Hz.


However, far more seriously, given the mention of 660-725V in the star or delta box, it might be that the windings expect to see 400 volts or so between the winding ends,

There are some variations on 690V supplies, options are 

3 phases of 690v to ground (1k2 between phases),   (to be fair only seen this sort of 3 phases supply in German factory)  for that you will need a transformer, but that  is not a likely inverter output to be fair.

or

3 phases of 400v to ground (690 phase to phase) you wire it as a star, and it draws 6.18 amps per line (only see this sort of 3 phase this on large sites in the UK)

finally , not 690 at all but most common (more like the UK street 3 phase standard).

3 phases of 230v to ground, 400v between phases you wire as a delta and it draws 10.7 amps per line


This sort of  marries up with the  5.5kw shaft power if we allow for some losses and power factors.


3 lots of 400V at 6A is 400*6 *3 = 7.2kVA, more like 6kw  when you allow for the power factor.


3 lots of 230V at 10.7A is 3_10*230 = 6.9kW, more like 5 and a bit with power factor.

Mike

looking at the nameplate,


I think 380-420V from 50Hz


or 440-480 from 60Hz.


However, far more seriously, given the mention of 660-725V in the star or delta box, it might be that the windings expect to see 400 volts or so between the winding ends,

There are some variations on 690V supplies, options are 

3 phases of 690v to ground (1k2 between phases),   (to be fair only seen this sort of 3 phases supply in German factory)  for that you will need a transformer, but that  is not a likely inverter output to be fair.

or

3 phases of 400v to ground (690 phase to phase) you wire it as a star, and it draws 6.18 amps per line (only see this sort of 3 phase this on large sites in the UK)

finally , not 690 at all but most common (more like the UK street 3 phase standard).

3 phases of 230v to ground, 400v between phases you wire as a delta and it draws 10.7 amps per line


This sort of  marries up with the  5.5kw shaft power if we allow for some losses and power factors.


3 lots of 400V at 6A is 400*6 *3 = 7.2kVA, more like 6kw  when you allow for the power factor.


3 lots of 230V at 10.7A is 3_10*230 = 6.9kW, more like 5 and a bit with power factor.

Mike