Rectifier Transformers

[Shadow]

Here are a couple more pictures of the transformers in the rectifier I disassembled.The large one has 11.0A,other two have 8.0A and 7.7A. I presume this means amps, but at what voltage? Pictured is the capacitor that was wired to the large transformer, I take it that is the oil filled AC capacitor mentioned?

were learning as we go here, but what are the items in the bottom picture? I think they are resistors,as they have 1k and the ohm sign, some have 100 etc.If they are can I use them to test my meter to see how accurate it is? And I believe the piece laying down is a blocking diode?

So the large transformer reduces the power from 120/240 down to 50-75 volts ac? Then it is recttified to Dc and further reduced via the other transformers to 48 volt DC? Or am I figuring this out wrong?

Editors Note:

Why spread this out over multiple stories rather than continue the discussion in the original posting on these units? Multiple stories makes it tougher for folks to follow the discussion.

Editor

[DanG]

Best guess is three discreet supplies (or 2 1/2) with main load transformer, controls power circut or isolation circut and interface power. The AC-DC part would be interesting to look at w/ oscilloscope, there may be synthesized AC waveforms created before DC rectifacation end - is source phase listed anywhere?

[drdongle]

The two smaller transformers are for control circuitry, the stud mount rectifier is a SCR. Yes "A" generally stands for AMPS when on a transformer.

Generally the AC in will be either 120 or 240 VAC the transformer secondary will be 60 V AC ( or there abouts) and the regulator converts it to about 52 V DC. The SCR is part of the DC conversion and regulation process often there are two of them used in conjunction with 2 regular stud mount rectifiers. The 4 devices make up a bridge rectifier that is phase switched to control the output voltage.

[Nando]

YOU ARE AN ELECTRONIC EQUIPMENT ASSASSIN !!!

Don't you dare to dismantle the others you have.!!!

SELL them in Ebay.

There are people that need them -- badly.

These are about 80-85 % efficient, very low noise and very good battery chargers -- mostly set for FLOAT CHARGE Mode.

See the photo of the transformer, the metal between the upper and the lower windings, and the 3 vertical sections of the core, you may be able to remove it and you may have a regular transformer.

Via direct mail send to me all the information about the unit, we may be able to get the schematic of it.

Like voltage and current capabilities, name of the company, model etc etc etc.

Regards

Nando

[Shadow]

Sorry Editor, I realize after I posted what I should have done. In fact this maybe should even be in my Diary.

           Nando, LOL I've been called alot of things but never an Electronics Assassin! I do understand tho where youre coming from, I realize these are a valuable piece of equipment to the right people. I guess after seeing them being dumped off at the scrap yard, their value diminished. But after taking one apart and seeing the inventory of parts in it,it gives me a whole new perspective on things.As for the transformer the front center section seems magnetic(small blue magnet sticks to it) but on the back side non of the red area is magnetic,(magnet stuck on laminates)

Not sure if any of this helps or not,Want me to take it apart?..lol kidding

I'm gonna weigh it tomorrow, its gotta be 100 lbs.

[Nando]

Shadow:

Where are you located, I may need one !!

Nando

[Shadow]

I'm in southern Saskatchewan, Canada. about 100 miles north of Montana border.

[Nando]

Heck!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I am in Texas !!!!!!

Darn it

Nando

[richhagen]

Nando, I figure it would be more than worth the shipping even if it is a couple of hundred pounds.  I built a 48V system and something like this would integrate into it well.  Probably lots of other folks thinking the same thing.  Rich

[mlz]

Howdy neighbor, I'm just south of the Canada/Montana Border (about 200 miles...)

[Shadow]

Howdy, I get down to Billings every so often, Are you near there?

          I'll try to get a weight and rough shipping cost  on these sometime in the next few days.

[healerenergy]

The foundry I work in has many cranes and some of them have equipment that looks just like the one pictured here and others are even bigger. If I can find a set of drawing Ill post them when I can get them scanned into a computer with some pictures I hope.

[marvin]

I've repaired those Lorain chargers before. From what I remember regulation (voltage and current) is achieved by firing an SCR across one winding to reduce the voltage on the winding with the rectifier bridge.  They are brutes, some rated at 200A @ 52VDC which is typical at telephone switch facilities. Bell/ATT still uses these at older sites and many are paralleled for 1000 - 2000A capacity. Not sure if I have drawings but could probably locate if anyone really needed them.

marv