UPS and inverter questions

[starfury1]

Re: UPS and inverter questions

if you are intending to put this thing into service..yeah new batteries wouldn't go astray.
Id make sure its charging correctly .....stating the obvious they say

good luck with it and keep us posted andrew77
(wish I could have been of more help)

Cheers all

[andrew77]

Re: UPS and inverter questions

Well, I guess the charging circuit is working normally. When I first plugged in the UPS the current across F1 started at 330mA and gradually went down to 3mA. When I turned on the power it went up to 100mA and then it started it's self diagnostics on the inverter. It was 300mA on the inverter and when it went to normal operation it was at 600mA and gradually went back down to 4mA.

So the battery is probably just showing it's age after being out of use for a year.

Apparently the microcontroller does some kind of test on the battery because I was seeing the current reverse every few seconds.

The microcontroller seems to be pretty powerful for being used like it is. It's ST72F324J6T5 datasheet. 8-bit, 32K of flash for program storage, 1K of RAM, 4 timers, 10-bit ADC, ...etc.

I guess I'll just run these batteries till they die, new replacements looked to be about $40 with shipping included.

I know Davmax gave me some pointers on the parts, but I'm still having problems. Do you have some more suggestions about a good place to get all the parts I need, so I don't have to order from all over the place? I'm thinking about replacing all of the MOSFET's on the broken UPS and have enough spares left to do it again if needed.

STP19NB20 is supposed to be a direct fit, I guess. IRF540NSTRL is another equivalent and this one has to be D2PAK. The last one I'm not sure about, but I saw this one mentioned on a Russian forum IRFZ44N .

I think that just about covers it for now.

[davmax]

Re: UPS and inverter questions

Andrew, You talk of replacing all MOSFETs. Really all?

that is 11 MOSFETs I believe. Please confirm.

[andrew77]

Re: UPS and inverter questions

Andrew, You talk of replacing all MOSFETs. Really all?

that is 11 MOSFETs I believe. Please confirm.

That's my plan.

But, only on the one that is missing parts at the moment.

[davmax]

Re: UPS and inverter questions

Right I have great replacements for you . All at Mouser.com

94-2358 replace with FQB33N10TM @ 99c ea (D2PAK)
IRF3205 replace with NTE2991 @ $4.51 ea (TO220)
IRF630 replace with FQP32N20C @ $1.70 ea (TO220)

Note that IRF540NL (94-2358) is not logic level gate.

When searching at Mouser or DigiKey use format
MOSFET 100V 33A

to bring up required devices

[andrew77]

Re: UPS and inverter questions

Right I have great replacements for you . All at Mouser.com

94-2358 replace with FQB33N10TM @ 99c ea (D2PAK)
IRF3205 replace with NTE2991 @ $4.51 ea (TO220)
IRF630 replace with FQP32N20C @ $1.70 ea (TO220)

Note that IRF540NL (94-2358) is not logic level gate.

When searching at Mouser or DigiKey use format
MOSFET 100V 33A

to bring up required devices

Thank you! That's exactly what I was looking for.

[davmax]

Re: UPS and inverter questions

On further consideration replace 94-2358 with FQB33N10LTM a logic level gate device. This is because we are not too certain about the original device and a logic level device will make absolutely sure all possibilities are covered.

[aquaman8]

Re: UPS and inverter questions

I know that it has been a while, but just wondering if the photos and attachments from this thread are available somewhere, as they don't come up when I read the thread? Reference to photos, drawings and attachments, but no images!

I am in process of repairing the same unit and the photos and schematics would be very very useful!

Thanks,

Mitch

[sengh]

Re: UPS and inverter questions

hello ,
I ve an APC RT 10000 , it display "" Internal Fault ""
What is the solution for this problem ,

[cb92]

Re: UPS and inverter questions

Welcome, Aquaman and Seng, to the site most likely to help you repair your units. I've looked a lot elsewhere, this is the best.
Nontheless, UPS repair is a real tough one. I have gotten lucky a couple of times finding a loose connection on a battery, and a blown diode on another unit. Blown diodes are easy, they split down the middle! Everything else hides.....
There are some APC schematics available, but little else. The manufacturers don't want these units fixed, they want to sell new ones. As far as I'm concerned, anything below 500 watts is disposable. I'll look at one for an easy fix, but will not waste time on a small unit.
Personally, I would love to find a shop manual for some units, especially APC, which is the most common one I see. I'm expecting a shop manual to direct the repairman to the most likely parts to go bad, give clues, etc. It would be absolutely super if there were a diagnostic program and a serial hookup to a computer!

[Per Hansson]

Re: UPS and inverter questions

sengh: Oh wow, that's a really nice UPS!
Tell you what, create a new dedicated thread for it.
And Welcome to Badcaps

btw, we wont be able to help much without some internal pictures and a longer description, what happened, did it work before etc?
Oh, and be sure to be very careful when doing the disassembly, those batteries contain a very big charge and could damage the UPS if shorted (or kill you for that matter)

[sengh]

Re: UPS and inverter questions

yes it works before ( 9 month ) and stop and display " internal fault'

[chhoton]

Re: UPS and inverter questions

In One SUKAM Falcon i Home UPS, the problem is that when I select the UPS mode, the inverter runs ok but when the mains AC supply comes back, the inverter does not run on MAINS, and it continues to run in inverters. plz help me out. I am a newbie here.........

thanks in advance

[Tariq4402]

Re: UPS and inverter questions

Thanks for all

[shovenose]

Re: UPS and inverter questions

In One SUKAM Falcon i Home UPS, the problem is that when I select the UPS mode, the inverter runs ok but when the mains AC supply comes back, the inverter does not run on MAINS, and it continues to run in inverters. plz help me out. I am a newbie here.........

thanks in advance

Hi, please create a new dedicated thread for your problems.

However, maybe this is helpful:

One of my three cyberpower ups's was suddently not noticing it was being plugged in. It would always run on battery. I realized it has a little red button on the back. Pressed it, and now it's fine. Might want to check if yours has this feature too!

[budm]

Re: UPS and inverter questions

That is the push to reset Thremal circuit breaker for the Main AC input.

[bandici]

Re: UPS and inverter questions

hi
please help me with a APC Smart UPS 750 or 500 schematic!
thanks

[cb92]

Re: UPS and inverter questions

The Rooskies have schematics, just Google your item.This is an example, I think it's the 500 Smart UPS.

[BurnInMyLight]

Re: UPS and inverter questions

Right I have great replacements for you . All at Mouser.com

94-2358 replace with FQB33N10TM @ 99c ea (D2PAK)
IRF3205 replace with NTE2991 @ $4.51 ea (TO220)
IRF630 replace with FQP32N20C @ $1.70 ea (TO220)

Note that IRF540NL (94-2358) is not logic level gate.

When searching at Mouser or DigiKey use format
MOSFET 100V 33A

to bring up required devices

Thank you! That's exactly what I was looking for.

Hello, I replaced the 94-2358 with the FQB33N10TM and doesn't work.
I have to search another problem or may be is not compatible this Mosfet? I bought 2 from a Chinese shop, so may be these are poor quality but i tested 2.

FQB33N10TM has worked to someone instead of 94-2358?
Thanks for reply