The Shop > Electronics & IC Programing

Transformer in reverse

<< < (3/3)

John Rudd:
Phil,
After reading your post( while I typing my previous reply ) I 've had a light bul mome.... :scr

Oh dammit....

But just another thought....the majority of inverters I've repaired/ tested have undervolts lockout on them....if the dc bus isnt high enough they wont run....

philf:
John,

To quote HopefulDave:

.....older inverters (ABB ACS300 series, for example) have two banks of reservoir capacitors, a little rewiring to put the neutral between the banks and live to two of the rectifier's three phase inputs and it thinks it has 480v in when you feed it 240... Again, derating by about a third is in order!

So, no undervoltage problems.

When I modded mine I ran it up via a Variac and an internal relay clicked in at 190v input.

Phil.

John Rudd:
Phil,
Yup you are right....what was I thinking! :Doh:

I can cobble up a bridge rectifier and a couple of largish caps to double the juice....connect this lot across the existing caps and away we go..... :zap:

Ok, seems a bit safer than the transformer route.....mebbe :coffee: :smart:

I'll sleep on it....

Navigation

[0] Message Index

[*] Previous page