You have a motor with a base speed of 1500 rpm @ nominal AC Volts of 220VAC - all good. It looks like it also has a continuous power rating of 2.2kW all the way to 8000 rpm (which means it has a very high break down torque rating = also good).
The encoder wiring would suggest that you have A, B and C channels (common quadrature encoder type signals) and that the voltage levels are 5VDC (TTL or RS422) . . . either are compatible with 95% of the drives on the market.
I did a little more sleuthing on the internet related to the encoder documentation you referenced - on page 110 and 122 of SIE-S626-2H.pdf there is a clear reference to the PG Encoder w/1024/counts per revolution and also references channels A and B to be used for position information (2-phase quadrature) and the C-phase being used as a once/rev reference signal. This is about the most common plain vanilla interface possible and is very easy to interface with.
Motor Rated Current:
Continuous = 3HP @ 23Amps
30 Minute = 5HP @ 32Amps
1 Minute = 6HP @ 38.4Amps (calculated as 120% of 30 minute rating)
Given all of the above information I would recommend the following . . .
For operation that is generally equivalent the Yaskawa Vector drive.
SP2203-LED Used at the Heavy Duty Rating provides:
* 22.5 Amps Continuous Current at 8kHz switching frequency
* 33.8 Amps @ 1-minute rating at 8kHz switching frequency
Alternately you could set it up for 6kHz switching frequency and get . .
* 24.2 Amps Continuous Current
* 36.3 Amps @ 1-minute rating
This is going to get you very close to the Yaskawa specifications and everything will be plug and play in closed loop vector mode. I doubt you will have to change more than 8 - 10 drive parameters from the factory settings in order to set this up. Also - vector technology has come a long way since the Yaskawa drive was designed and I wouldn't be surprised if you got considerably better performance from the SP-UniDrive