That’s the controller manual. You’re more likely to find an explanation in the RDWorks software manual, if you can comprehend it:

For cutting processing, the actual power is followed with cutting speed, lowers peed, lower energy, high speed high energy, so that we can guarantee the whole process of cutting energy evenly. So the minimum power corresponding to the energy at minimum speed, generally the minimum speed is 0, but if set takeoff speed, so the minimum speed is takeoff speed; the maximum power corresponds to the layer speed.