Installing Huanyung VFD on Heiz Zero3 Controller

[Boyan Silyavski]

Its very simple.

First- you dont connect the VFD 0-10vdc input to the LPT port.

You connect it via separate cable to the breakout board of the machine which has to have dedicated output for spindle speed control with a trimmer to adjust voltage. if board is good, that would need a separate small 12vdc 0.2A transformer to be connected to board.

On the VFd side typically VI is +, so are you sure about that schematics? Typically on any VFD i have seen VI is + and from diagram ACM must be the common, so double check that. Read manual cause may be depends if you have changed somewhere parameter "sinking" and "sourcing" and that changes. Depending on what region is set the VFD i mean that could change and be oposite, so take care and set it for EU. Cause maybe line HZ and voltage input is also not set right.


So question is:

what breakout board you have on your machine. In breakout board manual it is clearly stated how to connect to VFD.

If the breakout board lacks 0-10VDC output for spindle, then you will need a separate small board to do that. I will tell you from where and model, if thats the case.

[artmin]

Thank you Boyan,

The controller is a complete unit so it incorporates the breakout board as such, LPT1 input. I know that they have added an analogue 0-10V output for the VFD somewhere in the other 2 ports (LPT2 & 0-10V) but I don't understand what to connect. To me it looked like LPT2 is for a second command cable from the PC, but then there are no pin diagrams for the 0-10V port. Heiz have told me to 'connect the Inverter to the Port 0-10V and to the LPT2 port'. Am I just being stupid?

The VI is a +ve voltage okay and I have the VFD running on it's own by jumping FOR & DCM and a 10k pot on ACM, VI & +10V. It's just the control from the controller that's causing me a headache.

Many thanks,

Gavin

[Boyan Silyavski]

I read again what they say. So it seems from LPT2 pin 18 is the +10VDC, but you have to ask them again , where to take the - from.

That can not be right the breakout board and spindle control to have same common ground and power supply. But maybe they made it like that.

[artmin]

Thanks Boyan,

That was my worry. They are two separate units and don't have a common ground. Added to that one is a digital common ground for the start forward and one is an analogue ground for speed, so different I presume?

I haven't received the CNC controller yet so I can't probe any ports at the moment. I'm still trying to figure out what the lower 25 pin 0-10V port is for

Gavin

[Boyan Silyavski]

That was my worry. They are two separate units and don't have a common ground. Added to that one is a digital common ground for the start forward and one is an analogue ground for speed, so different I presume?


Gavin

Hey, i missed that. They must not have a common ground or connections to current from other circuits. They must be isolated. I speak for the 0-10VDC. Not for the ground of the box and the VFD ground. Thats why usually they are on separate PSU, the spindle speed control i mean. Assuming that they have that integrated, you only need to know wher to take + and - from. Nothing more.

In fact you must measure with multimeter to check continuity between spindle control - / 0-10VDC/ and VFD - input/ for the speed control/. There must be none.




Start forward on spindle, typically is implemented on VFD by closing a contact. usually the VFD provides the 24VDC and from breakout board side just a relay has to be closed, then the VFD knows to start. Once the relay is off, the VFD stops the motor. Look at the picture of your VFD schematics and you will see it. Anything different from that would be very strange.

[artmin]

Thanks Boyan,

You have answered the question whether I can join the digital & analogue earths within the VFD. I tested for continuity between them and they are certainly separate.

I hope to receive the new controller this week, but with the backlog of work I'm not going to have time to play with it, so I'll run it with the old Kress spindle in the meantime. As soon as I get a moment I'll probe the ports and see what I am getting from them. I was thinking that to get the speed control that I could maybe use pins 18 & 19 and connect those to VI & ACM of the VFD, but maybe that's mixing grounds between different machines again. If I'm stuck, to switch the spindle on & off, I can use the 240V spindle output to power a relay to operate contact between FOR & DCM and I have a 10k pot to operate the speed.

I'll update this as soon as I get any further.

Thank you,

Gavin

[Boyan Silyavski]

To me its definitely best to control spindle speed from software not pot. Cause there are certain moments when same tool will need different speeds for different tool paths.

And so a mistake could not happen if you forget to change speed manually.