Electronics > Repair
Xantrex/Sorensen XHR 40-25 schematic?
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coppercone2:
ok so if the relay is clicking on and off what does that mean.. how to recreate the problem


q215 is a low side driver for the relay. when it closes it energizes. something is causing that to open.u228a.

this is labeled overcurrent

the non inverting input is the input to this relay, the other shit is tied to rail. if rails are fine, so it has some shit going to ground, but the signal comes from r221 475k, which is tied to dc negative master, so the 18V rail goes through 1k1 to opamp input.

that op amp looks like its going into a rC delay for Q215.

so is this just a timer here? i think its also wired to the over voltage or whatever from the chip that connects to the shunt and the PSU

r294 to 297 is maybe a shunt for measuring current, goes into Isense on the chip

yeah idk its getting really complicated.'

But that is a clue, if its going over current protection, that might mean a shorted transistor some where I think... that chip might be measuring fine, and bad transistors are really common on power supply.


you can turn it on and probe that chip to see if its doing what its supposed to be doing. like measuring current and voltage

I think maybe just testing those transistors after the relay might be a good start, to look for damaged power transistors, possibly past the transformer. possibly at the output. i have seen more bad power supplies with just damaged power transistors then damaged control circuits, but I have seen power supplies that have damaged transistors and also control circuits. but the first one is more likely. and its likely if you find a bad transistor the control circuit for it might be damaged not some irrelevant one.

like sorensen has a good name, its considered reliable and high end, more then likely you don't have some deep control fault

it might be a transistor that is also connected to ground.like q114 h bridge


Q166 is like a crowbar or whatever, that abruptly sinks power if there is a fault to protect the output. this is the one you can disconnect and have a functional circuit still. r146 is like the front panel adjuster for the trip point.

test everything semiconductor in the top 1/5 of schematic page 95
coromonadalix:
Since its driven by u228a   

you may have some overcurrent situation / something is current consuming at some point  OR
its friend with the under voltage ic u228B  .... meaning you seem to / may have a triggering condition ???

Not sure about r317 r318,  if they act as a slight inrush current limitter or "voltage dropper"  and all of it is before the current sense resistors ... for the primary section

You have r221  who goes near r317 and goes to this ic u228a,  for sure its a sense line return ...

-----

yeah  its a tough cookie  psu  loll,  you have some pre-regulation circuit  and the power circuit

you have 3 power supply sections,  you have the small one (u64) who seems to give gives some clock to U21 ???,  and you have its output line who goes on U287 opto isolator,  who goes to U250

U287 must act as an ok supply to start U250 ???  or some clock pulse is driven ??   maybe the 50-60hz detection ??  but it seems autonomous ??       man  |O

you have to decypher circuit parts and try to figure out how they inter connect,  in some cases say :  you isolate 1 section and subs it with another dc source and try to see where it fails

you have p301  test points ? this is the dc voltage of the 1st power section  ...

and the  ususals checks for all the small voltages in this psu .. when its possible ...   there could be a domino effect,  one affect the other ....  |O
factory:
These are known as the Glassman LVP series over here, they are 1kW not kV.
We had about a dozen rack mount version at 150V 7A at work, can't remember any dying, the fan packed up in one.

There was however a very nasty fault with one of them, the voltage set pot would jump the output to maximum, when it got to a dead spot on the ten turn pot.  :o

There is a bigger 150V 20A version & a newer 300V 9A unit at work, those can burn stuff very nicely, if you have a fault on the unit under test.  :-DD

David
Chris56000:
Hi!

Update to my previous post – Manuals on k04bb now available for download!

Chris Williams
NikiG:
Hello, you maybe have problem in two components in corner?
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