HY VFD DCM connection

[Neale]

Thanks for the comments. My main concern was about the isolation of DCM inside the VFD but overnight it occurred to me that if I just check volts between FOR and DCM (expecting 12-24v or so), then both to control box ground, I can get some idea whether or not they are isolated. And if all else fails, I stick a relay in there. I've just found that I need to get a 16-pin IDC connector to pick up the analogue output on the UC300 as they don't provide that as part of the kit so things are going to be a little delayed anyway.

I have a copy of the manual - it's good that they show a circuit diagram of the board's interfaces. Gives a bit more insight into what's going on under the covers!

[dazp1976]

Thanks for the comments. My main concern was about the isolation of DCM inside the VFD but overnight it occurred to me that if I just check volts between FOR and DCM (expecting 12-24v or so), then both to control box ground, I can get some idea whether or not they are isolated. And if all else fails, I stick a relay in there. I've just found that I need to get a 16-pin IDC connector to pick up the analogue output on the UC300 as they don't provide that as part of the kit so things are going to be a little delayed anyway.

I have a copy of the manual - it's good that they show a circuit diagram of the board's interfaces. Gives a bit more insight into what's going on under the covers!

You can use Dupont 2.54mm wires/ connectors directly on the UC300eth IDC pins.
VFD FOR - DCM is just a ground sinking line.
External relay (or opto module) is needed to control it, COM/NC to make or break that single line (on/off).

See my posts of this cncdrive thread:
http://www.forum.cncdrive.com/viewto...=3780&start=30

There are some wiring diagrams on page3 and images on page4

Diagram here too:
http://www.forum.cncdrive.com/viewtopic.php?f=19&t=3829

Shows connecting relay via Bob and also dupont uc300 direct.
Has AO1 wires too.

(your vfd may differ slightly)