What have you changed. How do you have it wired. The spindle you have seems to be a 2 pole motor

In the manual I don't see a parameter to change the number of poles
From the manual:-

13. About Applicable Motor
1) The standard motor used is the 4-pole squirrel cage asynchronous induction motor. If other kind of
motor is used, please be sure to select the applicable inverter according to the rated current of the motor,
and please consult us if the user wants the inverter to drive the permanent magnetic synchronized motor.