Schneider Altivar 320 wiring / setup help needed

[Neale]

Quite a lot of BOBs just seem to have a simple opto-isolator output with floating connections, precisely to stop this kind of ground loop problem. The HDDB has an opto-isolator but then uses it to drive a MOSFET output stage for more switching capability (higher voltage/power than the typical opto-isolator). Clever idea but a bit of a pain in this situation!

[TadasM]

Gents,

Thank you for your help. I will do as advised - will use relays to control CW and CCW of spindle. I have ordered relay set from link provided by Lee Roberts. Will try and come back with results :)

One more idea I have, and I will risk to share it . UC300 have 2 analog outputs and those are without opto-isolator. Would this be a solution ? Or should I stick with opto-isolated outputs / relay confirguration ?


Another question I have regarding stopping spindle if e-stop is activated. At the testing VFD /spindle I had an issue that when UC300 gives message on screen that it has been disconnected - spindle is up and running anyway... I want to avoid that in the future. VFD has 2 relays that I could use for this purpose. Please see attached pic of the wiring I think to go with. I see that relays are 24v operated, can I use internal VFD +24V supply to drive the relays ?



Thank You

[Neale]

No, do not wire your VFD to BOB like that. That will put 24V on the output of the BOB which will probably destroy it. If the VFD has an estop input, you could take the output of the BOB to that so that it enables/disables with the stepper drivers, but this will need a relay between BOB and VFD, like the for/rev connections.