GSK980TDb CNC Controller User

Hi, we have a lathe machine with GSK980TDb CNC system, the spindle speed is controlled by an external frequency inverter, now there is situation that the spindle speeds on the screen is not matching with the real speed,  the speed on frequency inverter is the same with GSK980TDb, what could be wrong?

CNCmakers Support:

If the parameters remain not change, then it could be the spindle encoder issue, please check the spindle encoder.