Quote Originally Posted by Ricardoco View Post
Ok im going mad,, will someone take a look at these two items and tell me how they interface and how they connect to the bob please ive tried for two hours and when it gets to that my experience tell me im doing something wrong...

there are only three connections to the lenze 534 to the speed interface and although it only shows 1 connection to the breakout board there is also an rtn connection.....:confused:

Lenze534 vfd
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cncdoctor speed controler
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0-10v on speedcontroller TB2 to pin 8 on Lenze
0v on speed controller TB2 to pin 7 on Lenze
+ve on speed controller TB2 not connected


STEP on speedcontroller TB1 to BOB Output (typically pin 8)
RTN on speedcontroller TB1 to BOB Ground associated with the chosen output

Do NOT share the grounds... they may not be the same ground level...