I have my Y axis set to 400 in/min as a max speed in motor turning. Acceleration is set to 5.

When I jog the y axis will run at close to 800 in/min.
The motors run this fast (Belt is disconnected, but motor RPM is high). The Y Axis position readout moves at this speed which is how I'm calculating the actual speed. I ran it for a minute and it went from Y=0 to Y=800 in 60 seconds.

The speed readout will say 400ipm, or some times lower like 166ipm but its going faster.

When I change the acceleration to 2, the jogging speed increase to over 1200 ipm.

When I change the acceleration to 20 the jogging speed will run correctly at 400 ipm