The manual includes a troubleshooting section addressing common failures:

0-10V analog output for spindle speed (connects to VFD AVI pin). Analog ground for the spindle speed control.

If you want, provide the manufacturer name, a link, or upload the actual manual and I will extract exact specs, wiring diagrams, pinouts, Modbus maps, and step-by-step commissioning instructions.

Here’s what you can do to locate the correct manual, followed by a for interpreting such codes and finding obscure technical manuals.