Installing Huanyung VFD on Heiz Zero3 Controller

[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.