CyberPower PR1500 rackmount UPS - no response

[ran]

Hi all,

First, if this is beyond the purvey of this site, my apologies - let me know and I'll move on.

I've got a Cyberpower PR1500 rackmount UPS which now fails to turn on. No obvious damage, not dropped, no bad noises, smoke or anything. It was working fine, disconnected for a week, when plugged back in, it fails to turn on. No lights, no nothing. I can't figure out what may have caused this.

Things I've checked/tried:
- different outlets (different circuits, including original outlet)
- push reset buttons on back
- opened up to check for any fuses - there are 2 F30AHF30/250V ceramic fuses inside, but I checked for continuity, got the beep, so they seem ok.
- no obvious cap leakage or burn marks
- all connections seem secure
- let it sit plugged in overnight
- swapped out battery pack

I don't know what else to do. Could it be something as simple as a broken on/off switch? Any ideas that don't involve too much tinkering are welcome (I'm not an engineer.... )

[cashkennedy]

Re: CyberPower PR1500 rackmount UPS - no response

Most of these will charge the batteries when plugged in regardless of whether they are turned on or not. So a good place to start is reading the dc voltage going to the batteries when not plugged in and when plugged in. You could check the manual to confirm that it recommends / supports charging with the unit off. If its not even trying to up the voltage to the batteries when plugged in then your problem isn't the on off switch.

you should take the readings with the battery connected, which means you might need to take the readings of the battery close to the board, the positive (red) connects right next to the ceramic fuses and most likely either side of the fuses can be used as a test point for positive. Negative looks like it is soldered into the middle of the board. hard to tell from your pics, but there are some big red and black cables screwed to the heatsinks, those might also be connected to the positive and negative on the battery but I cant tell.

[goontron]

Re: CyberPower PR1500 rackmount UPS - no response

I have a similar one. The startup cap is crapped out. Ill bet, if you run a hairdryer over the board, expecaly twards the back of the unit, it will start up.

[budm]

Re: CyberPower PR1500 rackmount UPS - no response

Read this:
https://www.badcaps.net/forum/showth...ghlight=pr1500

[goontron]

Re: CyberPower PR1500 rackmount UPS - no response

Thanks^ i needed that info as well. One of these days i'm going to drop that thing on two 24v marine deep cycle batteries and drop the trafos in oil. Maybe the whole board too. Not sure if the board will handle transformer (mineral) oil. But thats for another thread, no need to derail this one!

[ran]

Re: CyberPower PR1500 rackmount UPS - no response

Well, thanks for the replies - and the link to the other thread, I didn't see that, though admittedly I assumed my question on this forum was unique, so didn't expect to see essentially the same problem!

I'll read through that thread and try to test a few things as mentioned here and in the other thread!

Again, thank you!
Ran