0-10V analog output voltage not constant (Resolved)

[HoY]

Did you get this resolved?

I would disconnect the analog wires from Acorn and do this test.
Go into the Wizard, set the max spindle RPM to 1000
Set the min RPM to 0

Connect ONLY a DC volt meter to Acorn Spindle Analog outputs.
Go into MDI
Command M3S100 do you get 1 volt?
Command M3S500 do you get 5 Volts?
Command MCS1000 do you get 10 Volts?

If so, get a 2 conductor cable, wire it from Acorn spindle analog outputs DIRECTLY to you VFD Analog Input Terminals, bypassing your ethernet cable.

Test your VFD again (don't forget to set your min/max spindle speeds back correctly in the Wizard. Write the settings AND RESTART CNC12! You must restart CNC12 for the spindle speed settings to take effect and Acorn to output the correct voltages based on the new speed set.

Let us know how you make out.
Marty

I do believe it is resolved, thank you. The heavier gauge wire seemingly corrected the issue. Previous to that, I had run the 0-10v directly to the volt meter and it output the voltage I was expecting without fluctuation. Only dipping while being plugged into the VFD.

[martyscncgarage]

Ok. Will mark resolved.

[eng199]

I do believe it is resolved, thank you. The heavier gauge wire seemingly corrected the issue.

The "heavier gauge wire" was actually shielded cable, correct?
I think the solution was to change unshielded cable to shielded cable.
The change from 23 ga to 18 ga is much less likely to have made an improvement.

I know of no reason you should have to use 18ga. Every installation I know of (Oak, All-in-one DC, GPIO4D and predecessors; not Acorn) uses 22ga or 24ga shielded.

18 ga was probably recommended at some point because it is easy to work with and durable. Carelessly striping half the strands off along with the insulation still leaves enough wire. I agree that there is no electrical reason for it.

[HoY]

It is apparently unresolved. I have just finished installing the board in the enclosure and wiring everything up to it and tested the spindle again for the same issue, and it has returned. The shielding is grounded with everything else, to the ground (earth) that the AC line come into the enclosure on.
Exactly the same issue as what was shown in the video I posted, and described. Except this time using 18ga shielded wire. I just disconnected the second pair of wires in the 4 wire bundle from the VFD, as they led nowhere in the acorn anyway (no vfd alarm input?) so the like is only carrying the 0-10v signal.

I attempted to disconnect the shielding from said cable, but then the acorn did something all together different. The voltage output while the shielding wire is disconnected goes up to around 1.2v and remains there.

I’m at a bit of a loss for now..

[HoY]

I think shielding was my issue again. I had grounded the shield wire on the ground lug inside the VFD as well as the ground bus bar in the cabinet, which should all be the exact same ground line in from the mains panel, but when I removed the ground from inside the vfd and reconnected it inside the control box, everything seemed to act normally again.


Edit: I think it might possibly have something to do with the type of 220v wiring we use in residential single phase. It’s 2 hot and 1 neutral, so the vfd would be grounding through the neutral. Even though, the neutral is still connected to ground in the panel, the extra noise from the 220v probably didn’t play nicely. (3 phase and several 1 phase filters on order)

[martyscncgarage]

If you are in US. 240 single phase is 2 hots, and one ground period.
Yes, there is a neutral and it and the ground are supposed to be tied together at the service entrance point and is used for 120VAC from Phase to neutral.

If your control is ALL 240VAC, you have two hots and one ground coming into your cabinet.
Where the ground is landed is where ALL shield drain wires and equipment grounds should come back to. You only ground ONE end of the cable drain wire and that's back to the equipment ground point.

There are VFD cables and I use them. I do not use an unshielded cable between the VFD and the motor. They are heavily shielded. My personal recommendation is to ground the shield at BOTH the VFD AND the motor along with the ground wire within the VFD cable. Belden wire and cable makes this recommendation and I personally follow it and have had no issues. Others may disagree.

[HoY]

If you are in US. 240 single phase is 2 hots, and one ground period.
Yes, there is a neutral and it and the ground are supposed to be tied together at the service entrance point and is used for 120VAC from Phase to neutral.

If your control is ALL 240VAC, you have two hots and one ground coming into your cabinet.
Where the ground is landed is where ALL shield drain wires and equipment grounds should come back to. You only ground ONE end of the cable drain wire and that's back to the equipment ground point.

There are VFD cables and I use them. I do not use an unshielded cable between the VFD and the motor. They are heavily shielded. My personal recommendation is to ground the shield at BOTH the VFD AND the motor along with the ground wire within the VFD cable. Belden wire and cable makes this recommendation and I personally follow it and have had no issues. Others may disagree.

Electronics are 110v while vfd is 220v. 220v is the same here in Canada. I do use shielded wire from the VFD to the spindle, and it is grounded as well. back when I got my first spindle upgrade from a router, the emi made the machine unusable until i got the proper wire. (16/3 shielded) https://www.digikey.ca/product-detail/e ... ND/1970762

with this issue dealt with, its on to the many many others. cant get the acorn to accept the tool clamp down sensor from my JGL-100
http://www.jian-ken.com/automatic-pneum ... motor.html

the acorn sends +24v from its input ports, and from what I understand about the proximity sensors inside the spindle, its trying to send the same 24v back to the board, so its not grounding it out its connecting positive to positive when the sensor is tripped. Again, I didnt have this issue with my previous board because the inputs on it were ground, rather than +24v, but its just another issue to work out.

[martyscncgarage]

You need NPN proximity sensors or you need to drive a small opto relay to ground the Acorn input.
Search Amazon for 24vdc opto relay

[martyscncgarage]

Many power supplies, Acorn included, will take 240vac. Even computer power supplies. Did you check them?

[HoY]

Many power supplies, Acorn included, will take 240vac. Even computer power supplies. Did you check them?

I know all of my power supplies will take 240vac. the primary reason I dont run them at 240vac is the VFD is not in the electronics cabinet but seperated by a few feet. Also, I had purchased a 250v AC LCD power meter to wire the cabinet through, but it is not compatible with our 240vac. just 2 wire 220v. so I just kept the setup the way it was. When I eventually find a supplier for a proper nema cabinet that I dont spend 400$ on shipping for I will revisit adding the vfd into the same enclosure and switching everything over to the single power input.

You need NPN proximity sensors or you need to drive a small opto relay to ground the Acorn input.
Search Amazon for 24vdc opto relay

I had come to that conclusion as well. Thank you for confirming it for me!