UPS making clicking noise while pc restarts.

charbel_hl · Jan 12, 2018

Hello and thank you for your time.
I have had my pc since 2015 and i upgraded some of my components like my gpu and my psu since the previous psu didn't support my new graphics card.

Problem:Few months later my pc started restarting on its own randomly while my ups started making clicking noise. So what I did was I baught a new ups upgrading it from 1500VA to 2000VA (around 900W which is bigger than my 600W psu) and the new ups came with a fan with it. But the problem wasn't solved and my ups re-started making random clicking noise while the fan turning on and off instantly followed by the restart of my pc.
So I changed then my motherboard since sometime it would appear that i have 4gb ram isntead of 8gb and the ram problem was solved maintaining 8gb rams no matter what but the restart issue maintains.
I sent my pc to a computer service see shop and they tested my pc and stress bench it but they told me that the pc didn't restart not even a single time so they gave me the ideas of plugging it without the ups which i tried but the pc restarted again by itself. Then i checked the voltage of a wall plug and it was 180V and then i checked the output of my ups which has a booster in it and it was 220V.

So most probably the problem is the voltage but shouldn't that be handled by the ups ? If not what should i do to repair it ?

Paperdoc · Jan 12, 2018

Your post gave me two things to question.

First, I don't know where you are, so I don't know what the normal electrical supply system is where you live. Because you say the UPS is outputting 220 VAC, I assume that is what should be coming out of your wall outlet. That is common in many parts of Europe and a lot of other places. (I am in North America, with 120 VAC the common outlet voltage). BUT you say the voltage you measured at the wall outlet is 180 VAC. I have never heard of that as a standard voltage, but maybe your country is supposed to be that way. Can you check that - two ways? First, find out what the wall outlet voltage is supposed to be. Then, re-measure what your outlets give. If they are not "standard" for your area, ask the electrical supply people why?

Second thought is this. There are two common ways the UPS systems can output power. The more complex and expensive systems are always using their output circuits to provide power to the load, and their separate charging systems are always charging up the battery to keep up with their use to provide that output. In this system, when the wall power supply fails or voltage sags, that affects mostly the charging circuits, but there is no interruption of power output. The less complex and cheaper systems do it differently. Under normal circumstances the power output to the load is just drawn from the supply from the wall, and there is no output of power from the batteries and converter system. There is a constant charging system operating to ensure the batteries are fully charged. Then there is a monitoring system that checks the power being output to the load. If that fails for any reason, there is a fast switching action that disconnects the link from input to the load, and turns on the converter system to supply the load with power from the battery. But that switching action sometimes can take a few seconds and may involve relays that "click". The result at the load (your computer) may be that the voltage drops low enough for long enough that it triggers a re-start of your computer.

If you have the second type of UPS, the voltage being supplied from your wall outlet may go low enough at some times that it triggers the UPS' internal monitoring system to make the switch-over. That can cause the clicking sound of relays and may cause a reboot of your computer if the switching time is too long. What you have posted prompts me to wonder whether the wall outlet voltage is too low most of the time, and sometimes drops so low that this switching action is triggered. That is why I suggest you verify what the wall outlet voltage is supposed to be, and what it really is.

charbel_hl · Jan 12, 2018

Paperdoc :

Your post gave me two things to question.

First, I don't know where you are, so I don't know what the normal electrical supply system is where you live. Because you say the UPS is outputting 220 VAC, I assume that is what should be coming out of your wall outlet. That is common in many parts of Europe and a lot of other places. (I am in North America, with 120 VAC the common outlet voltage). BUT you say the voltage you measured at the wall outlet is 180 VAC. I have never heard of that as a standard voltage, but maybe your country is supposed to be that way. Can you check that - two ways? First, find out what the wall outlet voltage is supposed to be. Then, re-measure what your outlets give. If they are not "standard" for your area, ask the electrical supply people why?

Second thought is this. There are two common ways the UPS systems can output power. The more complex and expensive systems are always using their output circuits to provide power to the load, and their separate charging systems are always charging up the battery to keep up with their use to provide that output. In this system, when the wall power supply fails or voltage sags, that affects mostly the charging circuits, but there is no interruption of power output. The less complex and cheaper systems do it differently. Under normal circumstances the power output to the load is just drawn from the supply from the wall, and there is no output of power from the batteries and converter system. There is a constant charging system operating to ensure the batteries are fully charged. Then there is a monitoring system that checks the power being output to the load. If that fails for any reason, there is a fast switching action that disconnects the link from input to the load, and turns on the converter system to supply the load with power from the battery. But that switching action sometimes can take a few seconds and may involve relays that "click". The result at the load (your computer) may be that the voltage drops low enough for long enough that it triggers a re-start of your computer.

If you have the second type of UPS, the voltage being supplied from your wall outlet may go low enough at some times that it triggers the UPS' internal monitoring system to make the switch-over. That can cause the clicking sound of relays and may cause a reboot of your computer if the switching time is too long. What you have posted prompts me to wonder whether the wall outlet voltage is too low most of the time, and sometimes drops so low that this switching action is triggered. That is why I suggest you verify what the wall outlet voltage is supposed to be, and what it really is.

Thank you for the fast reply!
To reply to your first question I live in Lebanon (M.E.) and the wall outlet should output 220VAC but due to the old infrastructure and political problems making renovation nearly impossible, my home is getting 180VAC and not a stable one (it ranges from 160 to 220).
Moreover i have the PCE 2000 VA and have used products from this company for years(and my home isn't new so i had the same problems since i was born here) so what bugged me is why did it start happening now and not from the start when i first baught the pc back in 2015 or even on my older PCs.

Paperdoc · Jan 12, 2018

There are many products from PCE Power Systems, but I agree most seem to be good designs, and most (all??) are of the continuous output variety. Without knowing the exact model number I can't tell if that applies to your unit. However, I did note that many of their units specify that they will tolerate input from 160 to 300 VAC, and you say you expect the supply to vary from 160 to 220 VAC. MAYBE there are times (more often recently?) when the wall voltage drops below 160 VAC? The specs for the UPS unit do not suggest there is any way to adjust them for a lower range of voltage input. Perhaps you can contact PCE Power Systems for suggestions on what might help your situation. Also ask them what the clicking sounds means, and whether the unit's output to your PC might sag briefly when the power supply voltage sags.

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