Confusion on dimensioning power supply and fuse for a motor
In the link:http://www.jvl.dk/default.asp?Action=Details&amp;Item=579 says you need 10A for single drive. 
If you have 3 motors, then it depends if they are spinning all of them at the same time or they interleave. The peak current will come into a play when accelerating, while in deceleration phase you get the regenerative power back. Therefore the most suitable PSU would have a large capacitor at the output. Some SMPSs have specified max capacitance they can handle, for countinous duty 6A is enough but you need a margin for peak load. 
For 3 drives you can use  something like 30A. You can DIY a PSU with a transformer, diode rectifier and large electolytic cap, you would need also inrush current limiter device at turn on. Or buy a SMPS with such overload characteristics that can accept large cap at the output, therefore you add a large elec. cap at the output (let say minimum 10 mili farad).
The fuses are nominal current, manual says 10Afor each drive.

EDIT: if you read the manual is writen everything: