GSK928TEII Spindle Speed Problem

Bolton Tools Lathe with GSK928TEII User:

I have a lathe that has a GSK928TEII controller.

The lathe is imported through Bolton Tools.

I need technical help.

I am using the controller to set spindle speed.

When I set the spindle speed to 2000 rpm, the actual speed will be 1020 rpm about half of what it is set at.

I have looked through the parameters P11 and P12 I believe everything is set right.

What would change the spindle speed to be off by half?

CNCmakers Support:

You can set the maximum frequency of the spindle inverter to match.