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Sadly I am still a little confused with what you mean. What I have done is to try and illustrate how the wiring is working - see link. MVI 6727 - YouTube

Umm please remember I am not that experienced in these CNC stuff more specifically the trouble shooting.

I have had the CNC machine running for about 5 mins so far thanks to you guys.
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Thanks guys for both your responses. Indeed I have purchased the Huanyang Inverter (HYA07D543B) and thanks to your advice below I have got the issue resolved.

My conclusion so far regarding the...

I recently had to purchase a new 1.5k VDF as my old one (photo attached) burnt out. I was recommend this particular VDF (photo attached) but when installed it I am unable to slow the spindel speed...