Help! why my feedrate is so high? 4500000mm display in gmoccapy!

I build a cnc using linuxcnc ethercat, it seems work nice, but the feedrate is very high, in gmoccapy display 4500000mm and in fact the machine run very fast! what did i do wrong things?

Lower MAX_VELOCITY in the ini file, both in the display section and TRAJ section.
Those numbers should be in mm/s, so 100 means 100mm/s or 6M/minute.

I found that the high feedrate is made by "#<fscale>=10000" in linuxcnc sample ngc file. thanks