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I bought a 6040 with a 1.5kw spindle and a bad controller with the plans of replacing the electronics. I ended up going with a uc300eth and gecko g540 setup and am now getting everything back together and need some help determining how the old vfd should be connected. The VFD is connected as it was in terms of power/spindle/display/manual-pc switch, but there are 4 wires which were previously running to either the old controller or breakout boards that im not sure what to do with.

I have yellow +10V, a red AVI, a block COM, and a white FWD wires coming off the VFD terminal and basically just need to know what each are, and how I would reconnect them or if they are needed. From what I have found it sounds like the +10v can be connected to an analog pin on the uc300eth and is used to control the spindle speed setting? Thinking maybe the FWD wire might toggle forward or reverse?

I am new to this and this is my first CNC machine, I dont have great eletronics/wiring experience so im not familiar with every term. Any help would be greatly appreciated!

I think it might be easier to wire those to the G540 speed control circuit. See the G540 manual.

The 10v+ is to send power to a manual potentiometer and is not needed. Your controller effectively becomes the 10v pot power when using analog from it instead of pot.
The AVI is your 0-10v+ analog connection (or manual pot wiper).
The COM as it suggests would be the GND analog connection. (or pot GND).
The FWD would normally be wired trough a relay NC contacts and the relay then controlled via your controller: So.... FWD> relay NC> relayCOM> back to vfd COM.


Some vfd have either a shared COM connection for both the control part and the analog part.
Others have a separate COM for them.
Example is... COM= for control part, ACOM= for analog part.
Double check yours.

There's a couple of diagrams in the linked topic below that give you an idea of how it works. Bear in mind the vfd is not the same (one that has separate COM connections).

viewtopic.php?f=19&t=3829


It may also be useful to look around in the 'Hardware' and 'Mach3' sections of this forum.

Dazp1976 wrote:The 10v+ is to send power to a manual potentiometer and is not needed. Your controller effectively becomes the 10v pot power when using analog from it instead of pot.
The AVI is your 0-10v+ analog connection (or manual pot wiper).
The COM as it suggests would be the GND analog connection. (or pot GND).
The FWD would normally be wired trough a relay NC contacts and the relay then controlled via your controller: So.... FWD> relay NC> relayCOM> back to vfd COM.


Some vfd have either a shared COM connection for both the control part and the analog part.
Others have a separate COM for them.
Example is... COM= for control part, ACOM= for analog part.
Double check yours.

There's a couple of diagrams in the linked topic below that give you an idea of how it works. Bear in mind the vfd is not the same (one that has separate COM connections).

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


It may also be useful to look around in the 'Hardware' and 'Mach3' sections of this forum.

I have attached a couple of pictures. Since I posted last I have verified my power was all set up correctly and fired up the uc300 and got it connected, all good there. I have my G540 wired up and ready to go. All that is really left to figure out is this vfd connection. I havent had the spindle connected when ive had the box powered on, but when I switch the control to manual the RPM control seems to be working. I assumed due to how this was previously connected and how the manual controls were set up (dont see a relay?) that I would be able to just hook this right to the uc300? I have seen a couple of places mention something about a relay setup. Would a chinese breakout board have a relay on it? because thats the only other thing I have removed from the box that the vfd may have connected to (I think it was only to old control board). I will keep looking, but would love any feedback. As I said, this is basically the last thing holding me up from firing everything up and getting started.

Spiral_RC wrote:

Dazp1976 wrote:viewtopic.php?f=19&t=3829

I have attached a couple of pictures. Since I posted last I have verified my power was all set up correctly and fired up the uc300 and got it connected, all good there. I have my G540 wired up and ready to go. All that is really left to figure out is this vfd connection. I havent had the spindle connected when ive had the box powered on, but when I switch the control to manual the RPM control seems to be working. I assumed due to how this was previously connected and how the manual controls were set up (dont see a relay?) that I would be able to just hook this right to the uc300? I have seen a couple of places mention something about a relay setup. Would a chinese breakout board have a relay on it? because thats the only other thing I have removed from the box that the vfd may have connected to (I think it was only to old control board). I will keep looking, but would love any feedback. As I said, this is basically the last thing holding me up from firing everything up and getting started.

So you have one with a 'SHARED' GND connection.
This means your switches and your Analog grounds both go there. I have attached a diagram showing the difference between how a manual pot and a cnc controller use the AVI and GND connections.

So look at the diagram showing the wiring and I done that one using the shared ground. And use the other diagrams I've added here from the other thread as well. (different vfd but the only change is how the GND works on yours) .
It is strongly advised to use a relay because of the shared ground. It is entirely possible previous board had a relay fitted.

Dazp1976 wrote:So you have one with a 'SHARED' GND connection.
This means your switches and your Analog grounds both go there. I have attached a diagram showing the difference between how a manual pot and a cnc controller use the AVI and GND connections.

So look at the diagram showing the wiring and I done that one using the shared ground. And use the other diagrams I've added here from the other thread as well. (different vfd but the only change is how the GND works on yours) .
It is strongly advised to use a relay because of the shared ground. It is entirely possible previous board had a relay fitted.

If it means I can just follow the diagram and hook it up, I will order a relay.

I looked at this page https://community.carbide3d.com/t/my-ge ... tory/23938 and he says he used a 48V 20A SPST relay? His setup seemed essentially the same as mine, so im assuming this would also be the same?

Sorry for what are likely dumb questions, im newer to the electrical stuff and am just trying to get through it without burning anything out. Im hoping I can just get it right, close the case up, and not have to worry about it again.

Would something like this work?

https://www.amazon.com/uxcell-Automotiv ... C97&sr=8-3

Dazp1976 wrote:The 10v+ is to send power to a manual potentiometer and is not needed. Your controller effectively becomes the 10v pot power when using analog from it instead of pot.
The AVI is your 0-10v+ analog connection (or manual pot wiper).
The COM as it suggests would be the GND analog connection. (or pot GND).
The FWD would normally be wired trough a relay NC contacts and the relay then controlled via your controller: So.... FWD> relay NC> relayCOM> back to vfd COM.


Some vfd have either a shared COM connection for both the control part and the analog part.
Others have a separate COM for them.
Example is... COM= for control part, ACOM= for analog part.
Double check yours.

There's a couple of diagrams in the linked topic below that give you an idea of how it works. Bear in mind the vfd is not the same (one that has separate COM connections).

viewtopic.php?f=19&t=3829


It may also be useful to look around in the 'Hardware' and 'Mach3' sections of this forum.

I am hoping I can get some follow up on this as its the last part needed before my machine is up and running. My spindle is functional if I change it to manual control and use the controls on the front of my case, so I know that part is good. I assume I have something either wired incorrectly or not set up right in UCCNC.

I purchased a solid state relay similar to this (https://www.amazon.com/Lexiesxue-G3MB-2 ... 82&sr=8-11)

I tried following the wiring diagram above marked "relay connected to uc300 direct" as I believe thats how I need it. I believe I have it set up as shown except it shows common from the relay going to ground on the VFD, and another from uc300eth analog ground to a separate ground on the VFD. I only have one ground on the VFD as seen in images above, so I have both the ground from P5 analog on uc300 and com from relay going to the same ground on VFD.

Based on the images of my VFD connections above, and the relay in link with pins 1-4, could somebody explain how this should be wired? In simple "pin 1 on relay to X, pin 2 on relay to Y" format?

As far as UCCNC configuration is concerned, I had the + from relay running to port 5 pin 1, and - to port 5 pin 25 (if I recall correctly, im at work atm). So in the UCCNC config theres a spindle PWM, which I set to port 5 pin 1. I also saw a section for relay setup in the config? But the only other pins im using on the UC300 are analog ports 5/6 coming from VHD.

I feel like I have everything ready to work, I just need some guidance on connecting the relay, uc300, and VFD correctly and the corresponding settings in UCCNC. Any help would be greatly appreciated.

I am still having no luck and hope somebody finds this and can help. I know the answer is probably easy but nothing I have tried has worked.In my researching a solution I found a person having a similar problem with the same VFD. The problem is he was using a different control board with a BOB, so it wasnt apples to apples and I need a translation to UCCNC and verification my relay is correct.

This post references the same VFD and helps answer some questions https://www.cnczone.com/forums/chinese- ... rrect.html

But theres a couple differences, my relay is a SSR g3mb-202p 5 volt, so it has 4 pins +, -, and what in the specsheet shows as load for the other 2 pins. His has a no/com/nc and a+-. But in looking around ive found people reference 4 pin relays as well, so I guess thats the first thing, will this relay work.

Currently I have it connected like this:
VFD AVI to uc300 analog 6
VFD COM to uc300 analog 5

relay load1 to VFD COM
relay load2 to VFD FWD

relay + to uc300 port 5 pin 1
relay - to uc300 port 5 pin 25

then in UCCNC on config>spindle I have PWM spindle checked and PWN pin set to 1 port 5. in config>I/O setup I have spindle PWM analog channel set to 1 (pin 6 on uccnc analog port)

Since I only have COM and not a ACM and DCM I have both the relay and analog pin 5 ground going to COM, is that the issue?

My spindle works on manual control so I know that part of it is good, but when I put in a s12000 nothing happens. At this point im not sure if its a wiring or software configuration problem, but im hopeful theres an easy solution and somebody can help me understand.

Hello Spirial

This is my " take away " from when I set up my VFD.

UCCNC will send two outputs to the VFD, the analog, via the 10Volt analog port will give you your speed, so if you see a change in the frequency displayed ON the VFD, you can change this on the PWM screen, when you hit the accept the VFD display should change.

If you see this then you know you have a signal coming out to the VFD, the second thing you need is a FWD command, this is what starts the spindle, when you have both your spindle will work.

Are you changing the VFD to accept external commands, on some VFD's you also need to set PD70 to 1 - check your VFD manual.

Hope this helps.

Ed