Hi Mactec54,

i have set the bridge between SEL and 24 volts again.

Result:
It works now.

But there is one more problem:
The voltage at the frequency converter is always around 10 volts when it is switched on. If I increase the spindle speed, the voltage becomes lower.

It seems like the 10Volt signal has to be reversed? You start from 0 to 10 volts from bottom to top.

This means that when the parallel port is connected to the USB adapter, the spindle starts immediately. Only after the start of the CNC program is it deactivated with the start button of the spindle.

Hi here i found a better Manual via Google:
https://www.google.com/url?sa=t&rct=...kcL9Wh98paCfWF

Can you set something in the frequency converter?

P.S: Every day one step further to the goal

Thanks Raini