I think there is a problem with the VFD Drive as it should be working around 8 to 10 for that machine
Because you Don't have and can not fit a Breaking Resistor to your VFD Drive you have to let it do it own controlled stop or you will burn up the IGBT's coasting to a stop won't help, you still can't use the brake until it has almost stopped
To use the Pot just change this Jumper JI to 1-2 Position
You will need to change some of those settings as they don't suit that motor what is the motor Rated Voltage