The CTs are Hall effect and so DC and pulsed measurements, the last ones I pulled had 150khz bandwidth 300A plus minus 150A , worth salvaging 😁👍, shame it didn't work. Will you bother looking at it or just salvage the parts??
The blue ones are in the DC circuit and the black ones in the AC circuit. Unfortunately, the blue ones are made with multiply smaller pins, some 11 pins to de-solder, actually hard to do, without melting it. I took it apart and saved the expensive components :) I really dislike SKiiP modules, as you can maybe see from the pictures, there is goo on the PCB. Two of the modules had leaked its goo'ee'ness everywhere.
@@KaizerPowerElectronicsDk yeah it was the blue ones I was referring to, the ones I have salvaged in the past usually have 4pins ..... anything I want from a board with multiple small pins I usually just cut the part out of the pcb without desoldering it😅 , and yeah I don't like those type bricks, scr's rectifiers etc .. better to cut the board and just tac the wires onto the solder points
When you say a simple unit, to me it seems complicated for what Is essentially a battery, an inverter and a microcontroller. Why do they need all those FPGAs? Thanks for the teardown though, interesting.
I see what you mean, I should properly have shown the function block diagram while saying that :) It was a reference to the design of a double-conversion inverter UPS! The Altera FPGAs are sampling all the analog measurements, like voltages, currents and frequencies in the system.
@@KaizerPowerElectronicsDk Mostly to handle the cycle by cycle current limiting, and also to handle the high frequency PWM used to keep the output voltage ultra stable over a wide range of load currents and power factors. Normally those do need a battery connected, as that massive input power surge will trip breakers, but with the battery bank (and the appropriate precharge resistors to keep the breaker contacts from disintegrating on power application) the power on inrush is a lot smaller, and the PFC is able to operate to keep it that way, riding the input voltage rise. Yes maintained similar size single phase ones, and the battery appetite is large, plus they are not really happy with poor mains quality. the bang on energising the bus from the battery banks can be rather disconcerting, so the easiest way to change batteries was to remove the one string, by disconnecting the fuses, then pull out the tray and swap the 72 total 7Ah SLA units (I made a lot of new wire links the first time, they had a lot of corroded ones, so on looking I put the bank back, and went to make 100 short links instead for the rest of the day) per bank, then connect the fuses when done to bring each half of the bank into play, and wait for a few minutes for the batteries to charge up, then do the other bank. That way you had smaller scorch marks on the HRC fuses. At least the older ferroresonant types used lower battery voltage, 36 or 48V, though a fault anywhere meant you either were buying a very expensive power darlington power block, or were going to be busy for a few hours changing out a tray of 2N3773 transistors, not bothering to see if any survived, because few did. 55W headlamp bulbs in the leads to them at least meant you could run it with no output, so you could see if the fault had been fixed without needing trays of transistors, or those $1k transistor blocks. Ordering TO3 transistors by the box of 900, because that way you got 6 trays of 150, so got matched batches. Only $2 each at that time as well, in bulk. Did enquire about another transistor, and got the reply that they could make them, but MOQ was 100k units, and they required a confirmed order with upfront payment, and 6 months lead time, at $40 per unit. A nothing special transistor, so in went the better spec 2N3773 in place of it.
It seems almost like ancients times, that repairs on component level was done. Now I see UPS systems discarded, unfit for repair, as a newer unit with warranty is a better choice over more expensive repairs, than buying new.
I find UPS systems often enough to try again another time :) One of the SKiiP modules had leaked its goo out, so most likely some kind of damage around that. But due to time constraints and working on the basement, out it went!
Eaton PowerWare 60 kVA UPS Teardown: ua-cam.com/video/DEqbqmqB7Rs/v-deo.html
Eaton PowerWare 30 kVA UPS Teardown: ua-cam.com/video/8efFFIwhKuA/v-deo.html
Eaton PowerWare 20 kVA UPS Teardown: ua-cam.com/video/UILLbEnZ4QU/v-deo.html
Good work, thanks 👍!
The traces on that control PCB are beautiful 😍
It's a great layout with digital on one side and analog on the other :)
The CTs are Hall effect and so DC and pulsed measurements, the last ones I pulled had 150khz bandwidth 300A plus minus 150A , worth salvaging 😁👍, shame it didn't work. Will you bother looking at it or just salvage the parts??
The blue ones are in the DC circuit and the black ones in the AC circuit. Unfortunately, the blue ones are made with multiply smaller pins, some 11 pins to de-solder, actually hard to do, without melting it.
I took it apart and saved the expensive components :) I really dislike SKiiP modules, as you can maybe see from the pictures, there is goo on the PCB. Two of the modules had leaked its goo'ee'ness everywhere.
@@KaizerPowerElectronicsDk yeah it was the blue ones I was referring to, the ones I have salvaged in the past usually have 4pins ..... anything I want from a board with multiple small pins I usually just cut the part out of the pcb without desoldering it😅 , and yeah I don't like those type bricks, scr's rectifiers etc .. better to cut the board and just tac the wires onto the solder points
Many double conversion UPSes will not power on without a working battery connected.
When you say a simple unit, to me it seems complicated for what Is essentially a battery, an inverter and a microcontroller. Why do they need all those FPGAs? Thanks for the teardown though, interesting.
I see what you mean, I should properly have shown the function block diagram while saying that :) It was a reference to the design of a double-conversion inverter UPS! The Altera FPGAs are sampling all the analog measurements, like voltages, currents and frequencies in the system.
@@KaizerPowerElectronicsDk Mostly to handle the cycle by cycle current limiting, and also to handle the high frequency PWM used to keep the output voltage ultra stable over a wide range of load currents and power factors. Normally those do need a battery connected, as that massive input power surge will trip breakers, but with the battery bank (and the appropriate precharge resistors to keep the breaker contacts from disintegrating on power application) the power on inrush is a lot smaller, and the PFC is able to operate to keep it that way, riding the input voltage rise.
Yes maintained similar size single phase ones, and the battery appetite is large, plus they are not really happy with poor mains quality. the bang on energising the bus from the battery banks can be rather disconcerting, so the easiest way to change batteries was to remove the one string, by disconnecting the fuses, then pull out the tray and swap the 72 total 7Ah SLA units (I made a lot of new wire links the first time, they had a lot of corroded ones, so on looking I put the bank back, and went to make 100 short links instead for the rest of the day) per bank, then connect the fuses when done to bring each half of the bank into play, and wait for a few minutes for the batteries to charge up, then do the other bank. That way you had smaller scorch marks on the HRC fuses.
At least the older ferroresonant types used lower battery voltage, 36 or 48V, though a fault anywhere meant you either were buying a very expensive power darlington power block, or were going to be busy for a few hours changing out a tray of 2N3773 transistors, not bothering to see if any survived, because few did. 55W headlamp bulbs in the leads to them at least meant you could run it with no output, so you could see if the fault had been fixed without needing trays of transistors, or those $1k transistor blocks. Ordering TO3 transistors by the box of 900, because that way you got 6 trays of 150, so got matched batches. Only $2 each at that time as well, in bulk.
Did enquire about another transistor, and got the reply that they could make them, but MOQ was 100k units, and they required a confirmed order with upfront payment, and 6 months lead time, at $40 per unit. A nothing special transistor, so in went the better spec 2N3773 in place of it.
It seems almost like ancients times, that repairs on component level was done. Now I see UPS systems discarded, unfit for repair, as a newer unit with warranty is a better choice over more expensive repairs, than buying new.
@@KaizerPowerElectronicsDk yeah consumerism in action, they don't want people repairing them🤷♂️
Try to repair it at least - As long as the magic smoke hasn't escaped it should be fixable.
I find UPS systems often enough to try again another time :) One of the SKiiP modules had leaked its goo out, so most likely some kind of damage around that. But due to time constraints and working on the basement, out it went!