Re: How to Set up a Huanyang VFD and 2.2KW Air Cooled Spindle
Originally Posted by
john_m0ers
Hi, after reading so many frustrating ( and confusing comments ), I and I'm sure many other people simply aren't sure about connections. Here in the uk we have 240v single phase, with brown live, blue neutral and gren/yellow earth (ground). To make matters worse there are several grounding methods. Our house was re-wired as p.m.e, and as such the incoming ground and neutral wires are joined where they enter the house. Looking at the schematic for the vfd, the mains input 2 or three phase goes through a bridge rectifier. So I assume live goes to R neutral to S or T, and earth to earth/ground. It is very confusing to here that you have two lives and ground, surely this would not work into a bridge rectifier. But hey, after reading all the different supply types and voltages I'm amazed anything but three phase works.
Regards john
Way back in the last century, I obtained my UK Industrial Electricians license, at that time it was a no-no for an installer to allow the Neutral and Earth to come in contact Anywhere in the installation, Earth was connected at the star point only.
I believe now, things have changed a lot.
In the UK you have 240v single phase which consists of one phase and a star point earth grounded neutral of a 3ph transformer, here in N.A. the domestic supply is a 240v 1phase transformer with centre tapped secondary, the C.T. being the earthed neutral for 120v-0-120v , as far as the input to the VFD which usually consists of a 3phase rectifer that is either fed with 3ph or 2 conductors of a 240v supply, it can tell no difference on the nature of the 240v 1ph supply.
One section of the 3ph rectifier is used as a 1ph bridge
Al..
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CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.