APC BACKUPS-RS550 not charging battery

[redwire]

Start a new repair thread, your model is different.
Mods, I would move it

[elbass7]

I have the APC BACKUPS 650 with a similar problem...however, it won't turn on the battery backup outlets, even with the unit connected to good 120VAC power. Just makes a ringing noise, which sounds like an inverter, but no power comes to the outlets. Only 3.45 volts are trying to charge a 12 volt battery. I took the battery out and charged it on my car charger on the slowest setting and it seems to hold a charge. After charging I can connect it to the UPS and with the unit unpluged from the wall, it make the same ringing noise. The green power light comes on, but pushing the on button does nothing.
Any help would be appreciated on next steps.

Eddy B

[theone111]

Re: APC BACKUPS-RS550 not charging battery

does anyone have a schematic drawing on 640-1172A-Z-REV05 printed circuit board an a APC Back-UPS PRO550?

Mine isn't charging the Batteries properly

cu Thorsten

Any luck finding and fixing? I have the same model and problem.

[theone111]

Re: APC BACKUPS-RS550 not charging battery

I have a similar problem with an APC BR550GI Pro UPS
https://www.se.com/il/en/product/BR5...ckups-pro-550/

[redwire]

Re: APC BACKUPS-RS550 not charging battery

For your 550, I only find bits pieces here: https://www.elektroda.pl/rtvforum/topic3529704.html
I have this schematic for APC 640-0259_REV05 which is I think is Back-UPS RS500, BR500i. No charging - electrolytic capacitor C7 22uF 16V usually bad. Check R28 runs very hot.

It is unfortunately different, 550 using IC2 TYN278PN and some add-on TL4 board with two 22uF 400V for C12. IC2 does not need the usual 22-47uF cap there on pin 2 BP/M.

[Thorsten Freak]

Re: APC BACKUPS-RS550 not charging battery

does anyone have a schematic drawing on 640-1172A-Z-REV05 printed circuit board an a APC Back-UPS PRO550?

Mine isn't charging the Batteries properly

cu Thorsten

[clearchris]

Re: APC BACKUPS-RS550 not charging battery

Did you check the date code on the "new" battery? Depending on where you get them from (don't get from amazon or ebay) they might not turn over quickly. Lead acid batteries go fast when they aren't hooked up to power...

[jinu_j]

Re: APC BACKUPS-RS550 not charging battery

If you left this idle for a year, it's likely your batteries are dead. Lead acid batteries do not take well to being left idle, just like in your car. I have a UPS that I'm not using at the moment, but I leave it plugged in. Best case is these batteries last 2-5 years when plugged in all the time. Dead UPS are always avaliable because the batteries go so quickly.

I had swapped the old battery with a new battery. But the problem continued.

[Curious.George]

Re: APC BACKUPS-RS550 not charging battery

If you left this idle for a year, it's likely your batteries are dead. Lead acid batteries do not take well to being left idle, just like in your car. I have a UPS that I'm not using at the moment, but I leave it plugged in. Best case is these batteries last 2-5 years when plugged in all the time. Dead UPS are always avaliable because the batteries go so quickly.

Note that "leaving it plugged in" can result in the battery being cooked by the UPS (many UPSs don't flat the batteries properly) so that, when you actually NEED it, you find the battery is toast (and, likely "bulging" -- often to the point where you can't easily get it out of the case!)

UPSs try to recharge batteries too quickly (and too cheaply!) on the premise that they may be "needed, again" in short order. It would be nice if the UPS could NOTICE the line conditions (i.e., how often there ARE outages and what their durations are) and adjust this policy accordingly.

For example, if you encounter brief "power flickers", then the battery is carrying the load for really short periods so charging it "more gently" is likely not going to increase your risk of it being insufficiently charged to handle the NEXT flicker (this of course depends on the average interarrival times of those events -- but the UPS can determine that empirically!)

Similarly, if the battery is deeply discharged by prolonged outages -- but they are infrequent -- then it can still opt for a gentler recharge (or, perhaps a quick influx of charge when power first returns but then switching to a slower charge rate to let the battery cool)

[clearchris]

Re: APC BACKUPS-RS550 not charging battery

If you left this idle for a year, it's likely your batteries are dead. Lead acid batteries do not take well to being left idle, just like in your car. I have a UPS that I'm not using at the moment, but I leave it plugged in. Best case is these batteries last 2-5 years when plugged in all the time. Dead UPS are always avaliable because the batteries go so quickly.

[jinu_j]

Re: APC BACKUPS-RS550 not charging battery

I am finally giving up on this repair. The Opto was a surface mounted device. Its placed right next to the transformer which has a lot of plastic on it. In my speed to remove the Opto from the board before causing damage to the transformer from the hot air gun, I succeeded in ripping up the pads and track from the PCB for one of the legs. There does not seem to be a way to salvage the situation. :-)

[budm]

Re: APC BACKUPS-RS550 not charging battery

Look at page 3 of spec sheet, the rank code marking is on the bottom right of the body.
You have A817V so body code is HCPL-817-06xE
If the rank code is '0' then the CTR is 50 ~ 600%. = HCPL-817-060E
If is marked an rank A = HCPL-817-06AE for CTR of 80 ~ 160%.
BTW, did you remove the opto and then check resistance of the Photo transistor side and the Emitter side?

[jinu_j]

Re: APC BACKUPS-RS550 not charging battery

Same problem here searching for the schematic. I came across the Russian page when i was searching for the schematic. The only difference between the board mentioned on that page and my board is the REV number. Mine is REV 06, on the page it is REV 07

Thanks. i will try replacing the Opto-Isolator. But I cant seem to the find the exact replacement part (A817V). Search for this leads to an equivalent HCPL-817.

But there are so many variants of it, i dont know which one to pick. They differ primarily on the CTR value ranging between 50% to 300%. Not sure which one is compatible to the one on the board

[budm]

Re: APC BACKUPS-RS550 not charging battery

No. It does not have a display panel. It is the RS-550 on my panel, but the circuit board is the same. Please see attachment for photo of front panel

That is strange that your RS-550 does not have LCD diSplay: https://www.youtube.com/watch?v=hGR-JkgiN3I.

From my research, the RS-550 uses PCB 640-1172A REV 05.

But put that aside, I cannot find the schematic of the PCB 640-1115A_REV 06 used in the UPS that you have.
I still suspect that opto-isolator is damaged when that TNY blew up.

[jinu_j]

Re: APC BACKUPS-RS550 not charging battery

So it is RS500 as shown in Russian link? not RS550?
RS550 has display panel, but your board does not have any connector that goes to the display panel.

No. It does not have a display panel. It is the RS-550 on my panel, but the circuit board is the same. Please see attachment for photo of front panel

[budm]

Re: APC BACKUPS-RS550 not charging battery

So it is RS500 as shown in Russian link? not RS550?
RS550 has display panel, but your board does not have any connector that goes to the display panel.


Show us the pictures of YOUR unit.
Your unit uses PCB 640-1115A REV. 06 as shown in your pictures and in Russian link.

[jinu_j]

Re: APC BACKUPS-RS550 not charging battery

Voltage across U1-OptoCoupler

Battery connected - With Mains power on but ups off
- Across pins 1 and 2 - zero
- Across pins 3 and 4 - 0.186V

Battery connected - With Mains power on but ups on
- Across pins 1 and 2 - 0.008V
- Across pins 3 and 4 - 0.186V

Battery connected - With Mains power off but ups on backup power
- Across pins 1 and 2 - 1.157V
- Across pins 3 and 4 - 0V

The unit i have is described here. Its in Russian i think but google translate to convert to english

[budm]

Re: APC BACKUPS-RS550 not charging battery

Is this the actual model you have?
https://www.apc.com/shop/il/en/produ...rentSite=false
Can we the rest of the unit and the transformers?
I wonder if opto U1 is damaged when the TNY blew up.

[sam_sam_sam]

Re: APC BACKUPS-RS550 not charging battery

Do you have any voltage on U1 on the input side of it

[jinu_j]

Re: APC BACKUPS-RS550 not charging battery

Yes the UPS has a separate transformer in the case. The transformer input is J3 and J4. The output goes to J2. When the UPS is on backup (battery) power, the transformer kicks in and voltage at J3 j4 is about 8V as battery is weak (about 10V) and the voltage at J5 is 210V.

When on main power all the voltages at the transformer at zero.

The UPS works fine and switches to battery power when mains power is switched off and switches back to main power when main power returns.