Electronics > Projects, Designs, and Technical Stuff
Seeking info on a giant battery charger
TerraHertz:
I'm looking for information on this:
L M Ericsson Pty Ltd. Melbourne Australia
Battery charger Type BMTP 244001 Mfg: 1985
Input 200-260V 50Hz
2400 VA Max (output up to around 40V 50A max)
The chassis wiring is mostly dead simple; what I'm after is an operating manual for the unit and most of all a schematic for the control board.
Can anyone suggest a source?
Perhaps not many of these were made. And being Australia possibly all documentation may be lost.
edpalmer42:
I don't have any specific info on that unit, but I doubt that it would go to 40V. It appears to be a 24V charger for lead-acid wet cell batteries that would be used in a rather small telco office. I wouldn't even call it a charger. It's actually intended as the primary 24V power source for the equipment. The batteries are across the output and are float charged while the equipment is operating. I'm not sure what Float 2 is for, but boost would be for occasional battery maintenance to ensure that they were fully charged and to remove any sulfate that might be accumulating. Units like this usually need some fairly significant batteries to meet their specified noise levels.
Ed
TerraHertz:
Maybe. I can't find my notes/photos of the battery string it was originally connected to.
The circuit is a bit surprising - huge transformer, with thyristor switching of the output rather than the input, then very beefy inductive chokes.
Since I guess I'll be tracing the circuit, I'll know soon enough. Also, will power it up soon.
You're right about the 'primary power'. But it was on telecoms stuff with a significant string of batteries.
I'm hoping to use it on a string of 15 single cell lead-acids. So in the 33V to 36V range. We shall see.
Oh, and I have two of them. Did have four, but dismantled two. They are very bulky and heavy.
BradC:
--- Quote from: TerraHertz on October 17, 2019, 09:38:47 am ---Maybe. I can't find my notes/photos of the battery string it was originally connected to.
--- End quote ---
The voltages stamped into the spec plate would be a bit of a giveaway.
beanflying:
Being 40V high current most likely it came out of a phone exchange and charged a bank of 2V cells. The 40V is not longer the normal but it used to be fairly sure we now run 50V :-//
So trawl Post Master General, PMG and not Telecom as your date is pre that I think.
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