It's a transformerless design. A car stereo amp can run on DC and provide a 50Hz AC sine wave output if that's what's being played through its line inputs. Scale that up to six 6.67kVA amplifiers running in three pairs, with an input supply of 384 volts DC and three out-of-phase 50Hz sine waves feeding them, and suddenly the transformerless UPS design seems a lot more plausible.
wow!, that is a very modular system!, and interesting to see its Mosfet based, not IGBT, different animal to my one! big score on parts!, those yellow cylindrical polyfilm caps are apparently good for coil guns and other high energy projects the Semikron packs should all be good too, big Thyristors I think
Hi. There is an interesting malfunction. Input power 380V is. The UPS does not turn on, there is no indication. What could be the problem? Предложить исправление
Hello colleague. The power supply code not is the shown on screen. My comments came too much time after. I am trying to find the cause why a 20K VT don´t turn on. I suppose that is the power supply, but I did not find anything wrong in it. Can you give a hand with this please?
Hello dear, I have a SU SU VT with a fault where the batteries do not fully charge. Reviewing the module I found two loose capacitors. I don't have the team plans. Can you please help me?
Thanks for sharing the tear down of the power module. I wish you had put in the piece where you took out the fan module WAN-0044. I'm curious if you ever had to replace that module yourself and if so, how difficult it was to do so. Can it be pulled off and swapped in a live unit or does it have to be completely shutdown in order to do this? It is a complete metal panel with 3 fans and from my understanding only replaceable as an entire unit. Individual fans cannot be replaced in the field from my understanding.
Definitely a maintenance bypass and pull-the-module job. I suspect the individual fans are replaceable if you can get hold of the correct model. When the power module went bang we had it replaced and recommissioned by an APC approved engineer, we (me and my colleagues) only had to get it down the steps. I've done a battery swap on it though. Dead easy.
I assume it's just got damp and flashed over, but there's gubbins in the back of the UPS chassis itself as well, plus the batteries. The damaged board is the main one of the two, with all the extra bits down the middle. Too much of a fiddle and it might not work, I'd rather have it for bits :)
It'd be a hell of a job, with a lot of work done in consumers' homes too. AC breakers may not be able to break DC effectively (video /watch?v=Zez2r1RPpWY gives a really good example using a knife switch). Also, conventional transformers lurk everywhere, in clock radios, washing machines, plug-top transformers and most older consumer electronics. To avoid accidentally plugging these into a DC supply it may be prudent to introduce a new design of plug and socket so that they can't be plugged in.
HVDC is cheap when it comes to transferring energy over long distances. Over short distances the cost of the converter stations outweighs the cost of AC transmission. Also, the foil-hat brigade would have an (electromagnetic) field day if we all had multi-kilowatt switched mode power supplies supplying our streets.
Many datacentre servers, routers and switches are available with DC-input power supplies, usually running on -48V DC, the same as telecommunications kit. Unfortunately where I work the only -48V DC kit is a Siemens iSDX 3000 telephone switch, the rest is 240V AC.
It's the sub-basement (one level below the basement) of an office which was originally a hotel. None of this is going on eBay. I'm sure I'll find a use for it :)
Or perhaps a redesigned earth pin (for UK at least). A pin that's not quite as tall would fit conventional sockets, but sockets with a shorter earth pinhole wouldn't take old plugs.
For getting it down the stairs that's exactly what we did do, I was below it (steel toe and hard hat) to guide it down, with a couple of others lowering it by its nylon packing strap (not the sharp plastic ones, this was more like a tow-rope). The old power module was scrap so it was left down there to gather dust.
hi mate, holly sh*t thats a beast!!! im loving the insides of that!! mate id love stripping that thing down lol it what i realy enjoy doing is stripping circuits down, the more on them the better lol, id say that this video was one of my favorite mate ;-)) THANKYOU AGAIN FOR SHARING ;-) BIG THUMBS UP*
Big ups and heavy duty i ever seen.i have 1 APC 8kva res in wearhouse and one 3000kva still run backup sometime went grid out .apc best brand ups they made durable device and highly quality.
Those stairs are steep, you work in an old converted mill or something? That is an awesome amount of goodies in there! Nice supply of cap screws too lol. Any plans for all this or is a lot going to be tested and eBayed?
hi mate, thanks for all your reply's ;-) im going to have to keep my fingers crossed for something like that to come in at the scrap yard lol, mate those boards were so beautiful ;-)))) and you had 3 !! you lucky bugger ha-ha ;-) take care mate and thanx anthony, high1voltage1rules
That's a beast of a UPS/Power Module. Can you tell us what the power module and UPS was for? Obviously backing up some serious equipment being so big and juicy. ;) You mention in your vid about two or three phase, so are these units three-phase? An amazing amount of electronics inside the thing.
yeah I have all of my networking equipment (switches, DSL modem, pfSense router, and my NAS) in my basement, but I wouldn't do that if there wasn't a dehumidifier running constantly to take the damp out of the air.
Nooooooo! Don't U even dare ! Now I'm going to find U wherever in UK U're hiding ! I am about to build a nice SPWM inverter, and honestly, these inverter boards w'd do most of the job for me... as at this stage I've got the driver board finished... Any chance to recycle anything ?
am I understanding that a car stereo can be con figured to drive the mosfets in my country at 60 hertzs to reach the power levels I want? surely not as simple as an mp3 recording of a pure sine-wave at 60 hertzs and an amplifier ?or an analog recording?
i have same model UPS and the UPS module is damaged. some body find that PSU -Nanna is damaged and they remove the chips beside the fuses so i cant repair it any more because of this missing components . i hope some body help me by send me pictures for the PSU - Nanna card or tell me where to buy it from?
It'd run pretty big house. A three phase supply in the UK with a 60 amp fuse for each phase would weigh in at 43kVA. My house has a single phase 60 amp supply.
Yep, and in all humbleness I was the program manager back in 2002-2004. Code name was "nanna", a Nordic goddess, that's why some boards still have Nanna silk screen
Hi, I pickef up a 8000watt model on auction which is 670lbs/300kg. I need to try and transport horizontally in a cargo van and will possibly be loading it myself. Besides removing the batteries and power module, which is half the width of the one in your video, is there any other parts that can be easily removed with use of a cordless drill that can lighten the unit up to make loading easier? My concern is lifting the bottom end up and pushing it in once I get it leaned up on the back of the van. Besides the batery (50lbs) and power module (180lbs), where is the rest of the weight, in the steel rack? Thanks
HomeValue Glass The batteries and power module are the only easily-removed things from one of these. The battery sounds very light though, they're typically 50lbs per battery slab, and there'll be several slabs in there as I'm pretty sure they're used in banks of 4 (one SYBT4 replacement battery pack is made up of four SYBTU1 battery slabs). Pull the power module (an 8kW/10kVA should be a fraction of the weight of the 40kVA one seen here) and pull the batteries, the chassis is then little more than a big steel box that's probably a two-man job. Three of us shifted the 40kVA without the batteries, I'm pretty sure we left the module in it.
I'm still learning about UPS, so please excuse me for such silly question. From what I've learned so far is that online UPS still use a "switch" to switch between AC-to-DC rectified current (direct from the mains) and the battery supply. Both of these are fed into some kind of DC-DC converters before going to the inverter. What kind of "switch" used in your UPS to do this switchover? I always wonder how fast the switch is, and (if it is not that fast) how the UPS maintains the continuity of the output supply in the switchover period? capacitors? how big for that huge load?
Think of a battery charger, a car battery and a mains inverter (one of those ones that plugs into a cigarette lighter, for example), all connected together. Plug the charger into the mains, plug a lamp into the inverter, switch everything on. Now the charger is charging the battery while the inverter is discharging it. Got it? Now switch off the charger. What happens?
AintBigAintClever Actually there are different kinds of UPS that have different modes of operation: Offline/ Standby-UPS: when the mains do supply their nominal voltage the inverter is not active and the loads (for example your PC) is directly connected to the mains, while the only circuit that is active inside the UPS is the charger witch simply maintains the charging voltage across the batteries. Once the nominal voltage at the input of the UPS becomes too low or even zero the inverter circuit is instantaneously kicking in and is only then being connected to the load (which is disconnected from the mains at the same time) This is normally done by a normal electromechanical relay). The Output voltage delivered by the inverter is not instantaneously rising to the nominal voltage of 110/120/230 or 240 V ( depending on the type of your grid) but take a fraction of a second.All PC power supplies however have big input capacitors that can act as a buffer for that fraction of a second. Online-UPS: The Inverter is active all the time and the load is actually never directly connected to the mains. The charger circuit is also working all the time. Online-UPS are much more expensive than offline-UPS.The common PC-UPS are almost always of the offline/standby -type and all of them I ever saw used a normal relay to switch the load from the mains to the output of the inverter. They normally use following topologies: Mains - Input Filter- Relays - Charger (flyback-converter) - Batteries - Inverter (push pull converter either with half bridge or full bridge configuration, switched with a normal PWM with duty cycle = 50 %) - Output Transformer (stepping up the switched battery voltage to 110/120 or 230/240 V while shaping the waveform from square wave to near sinusoidal )
I was looking at an Eaton Powerware UPS today. Didn't have a schematic so I started off by tracing where power goes and testing for power. When I apply power to the rectifier it isn't getting power. I got to the static switch and it is getting 480V in. There is a bus that shorts the other two terminals and goes to a fuse. The phase to phase voltage is 480V on the cable terminal and 280V phase to phase on the bus side. When I test from the cable to the bus the is a voltage drop of 50V. Wondering what anyone's thoughts are on this. First time troubleshooting a UPS I usually work on generators. I think the thyristor is a powerex.
Not my field but I'd check the phase-to-ground voltages on both sides of the static switches. 280V phase-to-ground would equate to 480V phase-to-phase so I'm wondering if you've lost two phases on the bus side. On the other hand should you be poking about in there without a service manual? If the UPS ends up in a worse state than before you looked at it, regardless of whether it's due to something you've done, then you'll be the one getting the blame for it; do someone a favour and get a shitload of hassle in return. Unless it's your own UPS that you're having a go at then it may be better to tell the owners to get it looked at by a UPS maintenance company, but of course to come back to you if they need a damned good generator guy. Mind you, I wouldn't be surprised if the UPS company say the entire UPS is knackered and they don't do board- or component-level repairs. If such repairs aren't available I doubt there'll even be service manuals out there, at least not ones with schematics that'd help nail the problem. Whatever happens, good luck with the damned thing. :)
AintBigAintClever it is one of 55 UPS's we maintain on our base. It's been down for 6 months (I just came in last week) and in external bypass. Figured because nobody complains when we lose power it would be a good unit to train the guys on. Just sticking to the basics, check for power the techs should be good enough to put anything back together that they take apart. The more I think of it the more I wonder why a contractor wouldn't be in-between. I think I need to take a better look at how I traced the conductors to see if I missed something... The UPS itself is a mess of wires (where the contactors and SS are), I would expect better off a high quality manufacturer but maybe I am to used to modular devices... If we can't do it I will be calling in a contractor in the next week.
It'd be good to see what the engineer does and maybe pick up some tips. It was interesting for example to see the engineer commission one of our APC Silcons a few years back (the one I scrapped in another video). Working near the AC connections his knuckles were probably half inch away from the terminals, no bother. Battery side? Rubber gloves on, no messing with a 400 volt DC bus! He told me one of the other guys he worked with made contact with the DC on an 800 volt system and the sudden contraction caused him to headbutt the UPS. If you have other identical UPSes that can be freed up then some trial by substitution might be a good idea, also you can compare readings between good and bad UPSes in their operational (if possible), on-battery, shutdown and in-bypass states in case what appears to be a fault might turn out to be normal behaviour for that part of the system and the real fault lies elsewhere.
AintBigAintClever I totally agree, the best part of the job is working with techs that have been in their field for over 10 years. We do have another model in an adjacent building. Plan is to swap a part if I feel with 90% certainty that it is the issue and none of the solid state devices show any signs of discoloration or stress. We fixed a 250kVA frequency converter yesterday, output filter had a loose wire short and fry three other capacitor common conductors. It is hard to believe the filters can vibrate that much with harmonics... Anyway I'll let you know how we make out since you were kind enough to respond so quickly. I will try the three phases to ground tomorrow and see if it cuts in half. 1-3 read 277, 1-2 read 278 and 2-3 read 281. Same phases read 483-485 on the first terminal of the thyristor/scr.
I went back down there today and retrieved the rest of the metalwork chassis. The fan grilles were held in with rivets, so I drilled those out and grabbed the grilles which can go with the fans, unbolted the insulating standoffs then threw the steelwork into our recycling skip. They're 24 volt fans but will run on 12 volts quite happily (and relatively quietly). I may have a use lined up for those, they won't be going anywhere near the variac :)
![[TH] FS vs BME - VCT Ascension Pacific - Lower Bracket Final](http://i.ytimg.com/vi/wnygqsR2Fig/mqdefault.jpg)
It's a transformerless design. A car stereo amp can run on DC and provide a 50Hz AC sine wave output if that's what's being played through its line inputs. Scale that up to six 6.67kVA amplifiers running in three pairs, with an input supply of 384 volts DC and three out-of-phase 50Hz sine waves feeding them, and suddenly the transformerless UPS design seems a lot more plausible.
wow!, that is a very modular system!, and interesting to see its Mosfet based, not IGBT, different animal to my one!
big score on parts!, those yellow cylindrical polyfilm caps are apparently good for coil guns and other high energy projects
the Semikron packs should all be good too, big Thyristors I think
Had to strip it apart to get it out, you should've seen us getting the replacement down those stairs!
Hehe, square-wave inverters go from being the cheapest shittiest inverters you can get to national standard :)
I work about 250 miles away from Andy.
Hi. There is an interesting malfunction. Input power 380V is. The UPS does not turn on, there is no indication. What could be the problem?
Предложить исправление
Will it cold-start with no input? www.apc.com/us/en/faqs/FA156611/
A small call centre and an IT comms room (20 48-port network switches and an IP telephone system).
Aha! I guessed there'd be optocouplers in there somewhere, thanks very much for the info!
Three-phase in, three-phase out. This one feeds a contact centre plus the server room for the whole building.
(although like you said most of the servers could also run on 300V DC).
Hello colleague. The power supply code not is the shown on screen. My comments came too much time after. I am trying to find the cause why a 20K VT don´t turn on. I suppose that is the power supply, but I did not find anything wrong in it. Can you give a hand with this please?
Hello dear, I have a SU SU VT with a fault where the batteries do not fully charge. Reviewing the module I found two loose capacitors. I don't have the team plans. Can you please help me?
And hear i was thinking my Smart UPS 2200 was heavy :P
1500 too (with 2batteries of 100A)))
Thanks for sharing the tear down of the power module. I wish you had put in the piece where you took out the fan module WAN-0044. I'm curious if you ever had to replace that module yourself and if so, how difficult it was to do so. Can it be pulled off and swapped in a live unit or does it have to be completely shutdown in order to do this? It is a complete metal panel with 3 fans and from my understanding only replaceable as an entire unit. Individual fans cannot be replaced in the field from my understanding.
Definitely a maintenance bypass and pull-the-module job. I suspect the individual fans are replaceable if you can get hold of the correct model.
When the power module went bang we had it replaced and recommissioned by an APC approved engineer, we (me and my colleagues) only had to get it down the steps.
I've done a battery swap on it though. Dead easy.
According to APC's website: 84.10 KG
I assume it's just got damp and flashed over, but there's gubbins in the back of the UPS chassis itself as well, plus the batteries. The damaged board is the main one of the two, with all the extra bits down the middle. Too much of a fiddle and it might not work, I'd rather have it for bits :)
I need help
Any one have apc ups tuner software
I need it to reinstall firmware in the smart VT model
It'd be a hell of a job, with a lot of work done in consumers' homes too. AC breakers may not be able to break DC effectively (video /watch?v=Zez2r1RPpWY gives a really good example using a knife switch). Also, conventional transformers lurk everywhere, in clock radios, washing machines, plug-top transformers and most older consumer electronics. To avoid accidentally plugging these into a DC supply it may be prudent to introduce a new design of plug and socket so that they can't be plugged in.
HVDC is cheap when it comes to transferring energy over long distances. Over short distances the cost of the converter stations outweighs the cost of AC transmission.
Also, the foil-hat brigade would have an (electromagnetic) field day if we all had multi-kilowatt switched mode power supplies supplying our streets.
Many datacentre servers, routers and switches are available with DC-input power supplies, usually running on -48V DC, the same as telecommunications kit. Unfortunately where I work the only -48V DC kit is a Siemens iSDX 3000 telephone switch, the rest is 240V AC.
It's the sub-basement (one level below the basement) of an office which was originally a hotel. None of this is going on eBay. I'm sure I'll find a use for it :)
Or perhaps a redesigned earth pin (for UK at least). A pin that's not quite as tall would fit conventional sockets, but sockets with a shorter earth pinhole wouldn't take old plugs.
Quite a few chunky busbars, but they're only 1.3kg in total. A lot of the weight was just steel.
For getting it down the stairs that's exactly what we did do, I was below it (steel toe and hard hat) to guide it down, with a couple of others lowering it by its nylon packing strap (not the sharp plastic ones, this was more like a tow-rope). The old power module was scrap so it was left down there to gather dust.
It's one of American Power Conversion's UPS ranges, although APC are now part of Schneider Electric.
dear bro i have also problem in board no output?
If you can find a 6-speaker, 6600 watt-per-channel car stereo that runs on 384 volts then yes.
Would have to roll out Power Line Ethernet at the same time. In for a penny...
Nice video, Thanks for sharing
hi mate,
holly sh*t thats a beast!!! im loving the insides of that!!
mate id love stripping that thing down lol it what i realy enjoy doing is stripping circuits down, the more on them the better lol,
id say that this video was one of my favorite mate ;-))
THANKYOU AGAIN FOR SHARING ;-)
BIG THUMBS UP*
Big ups and heavy duty i ever seen.i have 1 APC 8kva res in wearhouse and one 3000kva still run backup sometime went grid out .apc best brand ups they made durable device and highly quality.
hello how are you, have you repaired the SRT10KXLI APC models ?. Especially those with error code P.05?
Those stairs are steep, you work in an old converted mill or something?
That is an awesome amount of goodies in there! Nice supply of cap screws too lol. Any plans for all this or is a lot going to be tested and eBayed?
hi mate, thanks for all your reply's ;-)
im going to have to keep my fingers crossed for something like that to come in at the scrap yard lol, mate those boards were so beautiful ;-)))) and you had 3 !! you lucky bugger ha-ha ;-)
take care mate and thanx
anthony,
high1voltage1rules
Fans would b usefull.. Plenty parts
I'm jealous 😄 This would make 6 hi-fi mosfet power amplifiers and you dont even need to remove the mosfets or the heatsinks !
That's a beast of a UPS/Power Module. Can you tell us what the power module and UPS was for? Obviously backing up some serious equipment being so big and juicy. ;) You mention in your vid about two or three phase, so are these units three-phase? An amazing amount of electronics inside the thing.
yeah I have all of my networking equipment (switches, DSL modem, pfSense router, and my NAS) in my basement, but I wouldn't do that if there wasn't a dehumidifier running constantly to take the damp out of the air.
Nooooooo! Don't U even dare ! Now I'm going to find U wherever in UK U're hiding ! I am about to build a nice SPWM inverter, and honestly, these inverter boards w'd do most of the job for me... as at this stage I've got the driver board finished... Any chance to recycle anything ?
Good Evening , I have a UPS that of 40kVA that does not care, you could help me? & how to download Sofware of SUVT
All butchered for bits I'm afraid.
am I understanding that a car stereo can be con figured to drive the mosfets in my country at 60 hertzs to reach the power levels I want?
surely not as simple as an mp3 recording of a pure sine-wave at 60 hertzs and an amplifier ?or an analog recording?
Plenty copper... Ov..other.
Sir how to solution for system failure detected by surveillance fault...
i have same model UPS and the UPS module is damaged. some body find that PSU -Nanna is damaged and they remove the chips beside the fuses so i cant repair it any more because of this missing components .
i hope some body help me by send me pictures for the PSU - Nanna card or tell me where to buy it from?
where is the transformer(s) for dc to AC? I didn't see anything near big enough for that. even smart UPS 1500 had 2 that weigh about 20LB per.
Looks like you'd have all the parts,except output transformer to make a very good solid state audio amplifier
40kVA could probably power a small/medium size house on its own I would imagine.
It'd run pretty big house. A three phase supply in the UK with a 60 amp fuse for each phase would weigh in at 43kVA.
My house has a single phase 60 amp supply.
WOW! You can build a damn beasty switching HV PSU with these MOSFET modules!
usually big (high quality) UPSs have bleed resistors to discharge the caps when the equipment is off.
All the boards have "engineered in Denmark" stamped on them.
Yep, and in all humbleness I was the program manager back in 2002-2004. Code name was "nanna", a Nordic goddess, that's why some boards still have Nanna silk screen
Hi m8 !
Any of the power modules remaining at all ? Any of them for sale ?
Cheers
mark
Your unknown chips on the control board are HCPL-2631 10Mbps optocouplers
Thank you for the video! So what are you going to do with it now?
Wow. I yesterday received my new APC 1kVA Smart-UPS unit for private use at home, and thought it was a hefty piece of equipment :-o
Check out my Silcon DP320E video, that thing's a touch bigger (despite having half the power output).
Make an induction heater with it >:]
Hi, I pickef up a 8000watt model on auction which is 670lbs/300kg. I need to try and transport horizontally in a cargo van and will possibly be loading it myself. Besides removing the batteries and power module, which is half the width of the one in your video, is there any other parts that can be easily removed with use of a cordless drill that can lighten the unit up to make loading easier? My concern is lifting the bottom end up and pushing it in once I get it leaned up on the back of the van. Besides the batery (50lbs) and power module (180lbs), where is the rest of the weight, in the steel rack? Thanks
HomeValue Glass The batteries and power module are the only easily-removed things from one of these. The battery sounds very light though, they're typically 50lbs per battery slab, and there'll be several slabs in there as I'm pretty sure they're used in banks of 4 (one SYBT4 replacement battery pack is made up of four SYBTU1 battery slabs).
Pull the power module (an 8kW/10kVA should be a fraction of the weight of the 40kVA one seen here) and pull the batteries, the chassis is then little more than a big steel box that's probably a two-man job. Three of us shifted the 40kVA without the batteries, I'm pretty sure we left the module in it.
40kVa... Wow.. Damn thing is almost a work of art.. I want one! shame i don't have 6 grand just for the main module.. bloody hell.
I want just a one brick out of this device))
Good morning, I have a UPS that of 30kVA that does not care, you could help me?
Batteries are ok
internal fuses ok
Dear sir
Do you have apc ups tuner software
Interesting, thanks :-D
Amazing. The quality looks really good too. Off course it's made in the U.S.A., Isn't it?
Designed in USA made in poor asian countries.
What equipment does that UPS support?
I'm still learning about UPS, so please excuse me for such silly question.
From what I've learned so far is that online UPS still use a "switch" to switch between AC-to-DC rectified current (direct from the mains) and the battery supply. Both of these are fed into some kind of DC-DC converters before going to the inverter. What kind of "switch" used in your UPS to do this switchover?
I always wonder how fast the switch is, and (if it is not that fast) how the UPS maintains the continuity of the output supply in the switchover period? capacitors? how big for that huge load?
Think of a battery charger, a car battery and a mains inverter (one of those ones that plugs into a cigarette lighter, for example), all connected together. Plug the charger into the mains, plug a lamp into the inverter, switch everything on. Now the charger is charging the battery while the inverter is discharging it.
Got it?
Now switch off the charger. What happens?
AintBigAintClever
Actually there are different kinds of UPS that have different modes of operation:
Offline/ Standby-UPS: when the mains do supply their nominal voltage the inverter is not active and the loads (for example your PC) is directly connected to the mains, while the only circuit that is active inside the UPS is the charger witch simply maintains the charging voltage across the batteries. Once the nominal voltage at the input of the UPS becomes too low or even zero the inverter circuit is instantaneously kicking in and is only then being connected to the load (which is disconnected from the mains at the same time) This is normally done by a normal electromechanical relay). The Output voltage delivered by the inverter is not instantaneously rising to the nominal voltage of 110/120/230 or 240 V ( depending on the type of your grid) but take a fraction of a second.All PC power supplies however have big input capacitors that can act as a buffer for that fraction of a second.
Online-UPS: The Inverter is active all the time and the load is actually never directly connected to the mains. The charger circuit is also working all the time.
Online-UPS are much more expensive than offline-UPS.The common PC-UPS are almost always of the offline/standby -type and all of them I ever saw used a normal relay to switch the load from the mains to the output of the inverter.
They normally use following topologies:
Mains - Input Filter- Relays - Charger (flyback-converter) - Batteries - Inverter (push pull converter either with half bridge or full bridge configuration, switched with a normal PWM with duty cycle = 50 %) - Output Transformer (stepping up the switched battery voltage to 110/120 or 230/240 V while shaping the waveform from square wave to near sinusoidal )
Micro UPS is best
What does a smartUPS do?
I was looking at an Eaton Powerware UPS today. Didn't have a schematic so I started off by tracing where power goes and testing for power. When I apply power to the rectifier it isn't getting power. I got to the static switch and it is getting 480V in. There is a bus that shorts the other two terminals and goes to a fuse. The phase to phase voltage is 480V on the cable terminal and 280V phase to phase on the bus side. When I test from the cable to the bus the is a voltage drop of 50V. Wondering what anyone's thoughts are on this. First time troubleshooting a UPS I usually work on generators. I think the thyristor is a powerex.
I'm thinking the thyristor is bad, but I don't like to jump to conclusions
Not my field but I'd check the phase-to-ground voltages on both sides of the static switches. 280V phase-to-ground would equate to 480V phase-to-phase so I'm wondering if you've lost two phases on the bus side.
On the other hand should you be poking about in there without a service manual? If the UPS ends up in a worse state than before you looked at it, regardless of whether it's due to something you've done, then you'll be the one getting the blame for it; do someone a favour and get a shitload of hassle in return.
Unless it's your own UPS that you're having a go at then it may be better to tell the owners to get it looked at by a UPS maintenance company, but of course to come back to you if they need a damned good generator guy.
Mind you, I wouldn't be surprised if the UPS company say the entire UPS is knackered and they don't do board- or component-level repairs. If such repairs aren't available I doubt there'll even be service manuals out there, at least not ones with schematics that'd help nail the problem.
Whatever happens, good luck with the damned thing. :)
AintBigAintClever it is one of 55 UPS's we maintain on our base. It's been down for 6 months (I just came in last week) and in external bypass. Figured because nobody complains when we lose power it would be a good unit to train the guys on. Just sticking to the basics, check for power the techs should be good enough to put anything back together that they take apart. The more I think of it the more I wonder why a contractor wouldn't be in-between. I think I need to take a better look at how I traced the conductors to see if I missed something... The UPS itself is a mess of wires (where the contactors and SS are), I would expect better off a high quality manufacturer but maybe I am to used to modular devices... If we can't do it I will be calling in a contractor in the next week.
It'd be good to see what the engineer does and maybe pick up some tips. It was interesting for example to see the engineer commission one of our APC Silcons a few years back (the one I scrapped in another video). Working near the AC connections his knuckles were probably half inch away from the terminals, no bother. Battery side? Rubber gloves on, no messing with a 400 volt DC bus! He told me one of the other guys he worked with made contact with the DC on an 800 volt system and the sudden contraction caused him to headbutt the UPS.
If you have other identical UPSes that can be freed up then some trial by substitution might be a good idea, also you can compare readings between good and bad UPSes in their operational (if possible), on-battery, shutdown and in-bypass states in case what appears to be a fault might turn out to be normal behaviour for that part of the system and the real fault lies elsewhere.
AintBigAintClever I totally agree, the best part of the job is working with techs that have been in their field for over 10 years. We do have another model in an adjacent building. Plan is to swap a part if I feel with 90% certainty that it is the issue and none of the solid state devices show any signs of discoloration or stress. We fixed a 250kVA frequency converter yesterday, output filter had a loose wire short and fry three other capacitor common conductors. It is hard to believe the filters can vibrate that much with harmonics... Anyway I'll let you know how we make out since you were kind enough to respond so quickly. I will try the three phases to ground tomorrow and see if it cuts in half. 1-3 read 277, 1-2 read 278 and 2-3 read 281. Same phases read 483-485 on the first terminal of the thyristor/scr.
I went back down there today and retrieved the rest of the metalwork chassis. The fan grilles were held in with rivets, so I drilled those out and grabbed the grilles which can go with the fans, unbolted the insulating standoffs then threw the steelwork into our recycling skip.
They're 24 volt fans but will run on 12 volts quite happily (and relatively quietly). I may have a use lined up for those, they won't be going anywhere near the variac :)
can u help me
please I have prloblem in this model
if you have the circuit diagram for the device we can help you to fix any problem.