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Thread: SeaSonic SSR-750TD Crackling / Popping when switching off

  1. #11
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    Quote Originally Posted by Yaponchik View Post
    Probably a second in duration though I would imagine it much lower. I am 100% sure that it is from the PSU as I can "feel" the sound, on the finger I use to switch the AC I/O to off.

    The oscillator winding down as the capacitors discharge? I assume it is with the PC off, so the holdup time will be long.

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    Quote Originally Posted by ashiekh View Post
    The oscillator winding down as the capacitors discharge? I assume it is with the PC off, so the holdup time will be long.
    Hi Ashiekh,

    I read this somewhere as well, that the capacitors discharging would be responsible for this sound and that it was normal... A lot of other people on the other hand, have been saying, such sounds isn't normal.

    @jonnyGURU,

    I am refraining from switching off the PSU although I will still try to replicate the problem... I hope that the built in safety features are enough to safeguard my equipment in case something goes awry...

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    I'm a bit like you, every little sound is the machine trying to tell me something, so I can sympathize that this may be driving you crazy; but in this case all may be fine. For example, my light switches sometimes give a pop when turned on, because I catch it when the AC is at a high point.


    Another thought, although probably not relevant here

    Quote Originally Posted by Yaponchik View Post
    I actually have a better ground than the store, as they plug directly to wall outlet.
    The ground is like a chain, only as strong as its weakest link; something extra isn't going to make for a better ground and might even make it worse.

    Quote Originally Posted by Yaponchik View Post
    I am actually operating the UPS in AVR-high voltage sensitivity setting - where the UPS is aware that my CPU is sensitive to voltage fluctuations and waveform distortions, providing stable power delivery (the UPS AVR switches to battery power when voltage fluctuations are too high/low for it to compensate)
    Is it a sine-wave UPS? If not it will be outputting a distorted waveform, and a good AVR uses the transformer windings to compensate for voltage fluctuations; switching to battery to compensate will wear out the battery.

    Most modern power supplies can run on 110V, so a brownout on 220V is not really an issue (I'm assuming you are in Hong Kong).
    Last edited by ashiekh; 06-19-2018 at 12:23 PM.

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    Quote Originally Posted by ashiekh View Post
    I'm a bit like you, every little sound is the machine trying to tell me something, so I can sympathize that this may be driving you crazy; but in this case all may be fine. For example, my light switches sometimes give a pop when turned on, because I catch it when the AC is at a high point.


    Another thought, although probably not relevant here



    The ground is like a chain, only as strong as its weakest link; something extra isn't going to make for a better ground and might even make it worse.



    Is it a sine-wave UPS? If not it will be outputting a distorted waveform, and a good AVR uses the transformer windings to compensate for voltage fluctuations; switching to battery to compensate will wear out the battery.

    Most modern power supplies can run on 110V, so a brownout on 220V is not really an issue (I'm assuming you are in Hong Kong).
    Hi ashiekh,

    Thanks for putting my mind at ease. Yes, every little thing counts and it is indeed, driving me crazy. Although the only "popping" I experienced is from my previous house, when using the induction stove together with the microwave and washing machine (dad life, you know) - the socket trips probably because of overloading the line.

    I do understand the way you see electrical connections, specially grounding for this matter, and I am in 100% agreement. You can't shortchange something that would potentially save you from a massive power surge.

    My UPS/AVR tech specifications are listed here and according to it, the waveform type is a "Stepped approximation to a sinewave." I am not in HK, but am couple of hours away (PHL), so the standard socket we have carries 220V.

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    Quote Originally Posted by Yaponchik View Post
    the waveform type is a "Stepped approximation to a sinewave."

    Which is a terrible distortion over a sine wave; if I were you I'd turn the AVR to less aggressive.

    Ah, so "Location: Pearl of the Orient" is the Philippines, not Hong Kong
    Last edited by ashiekh; 06-20-2018 at 05:30 AM.

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    Quote Originally Posted by ashiekh View Post
    Which is a terrible distortion over a sine wave; if I were you I'd turn the AVR to less aggressive.

    Ah, so "Location: Pearl of the Orient" is the Philippines, not Hong Kong
    Hi ashiekh,

    What do you mean? I should change my UPS? Forgive my ignorance, but from the manual for AVR highlights:

    “Double boost and single trim” AVR instantly corrects
    voltage fluctuations without using the battery, allowing you
    to work indefinitely through inconsistent power, saving
    battery life for outages.
    And for the operation modes:



    I am using the second to the last one. If my UPS is at fault here, please let me know. I would like to also know your suggestion, on what to replace it with.

    As for location, it can refer to either HK or MLA

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    Ah, my bad; it doesn't use the battery for AVR, then all is fine(ish).

    At the risk of worrying you further, there was quite a discussion of the problem with the stepped approximation to a sine wave
    http://www.jonnyguru.com/forums/show...t=15730&page=4

    where Per_Hanson pointed out some scary data relating to APFC (Active Power Factor Correction) power supplies running on such wave forms
    https://digilander.libero.it/hibone/...est_Report.pdf

    Location can be important when people are trying to figure out your voltage or what supplies are locally available.

    One can drive oneself quite nuts with details like the stepped sine-wave approximation.
    Last edited by ashiekh; 06-20-2018 at 01:44 PM.

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    Quote Originally Posted by ashiekh View Post
    Ah, my bad; it doesn't use the battery for AVR, then all is fine(ish).

    At the risk of worrying you further, there was quite a discussion of the problem with the stepped approximation to a sine wave
    http://www.jonnyguru.com/forums/show...t=15730&page=4

    where Per_Hanson pointed out some scary data relating to APFC (Active Power Factor Correction) power supplies
    https://digilander.libero.it/hibone/...est_Report.pdf

    Location can be important when people are trying to figure out your voltage or what supplies are locally available.

    One can drive oneself quite nuts with details like the stepped sine-wave approximation.
    Hi ashiekh,

    Worry me more, and I shall be pleased (the more you know, rght? ). This is an eye opener for me. I did quite a lot of research proceeding your comments about sine wave, and man, did those links you sent make sense.

    Based on the links provided, stepped sine-waveform would work for my case, but is not recommended as there are unintended consequences of cutting short the PSU's component lifespan. That said, I did check the PSU while on, and there is a very faint buzzing sound. Literally, I would have to turn the PC off (so no fan noise) and put my ear literally to the metal (it's cold lol) to hear something ...

    This is a by-product of the stepped sine wave of my UPS, I am led to believe?

    Now I am itching to plug it directly to the wall for the first time since I got it and check that very very faint buzz ifit still exists.

    With regards to power in my country, we have 220V delivered to the home @ 60Hz. I wouldn't say the electricity is garbage, but maybe every 3 - 5 years we get the random exploding transformer somewhere in the neighborhood (fixed by the electric company in an hour) and I'd imagine the surge causing that isn't good (killed off a DSL modem's power supply before) so I bought the UPS as added insurance.

    It's basically the same with OP on the JG thread you provided, the highest end model available to consumers like me for my application is already this; there is one specific model consumers can get, which waveform is pure sine wave, but it costs thrice as much (US$600) and is rated 3000 VA / 2400 W.

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    The stepped approximation is only for when the UPS is running on battery; you might want to try that, and then you will probably hear a lot more buzzing.

    If you are only worried about surge, get a good surge protector; it will save you having to replace all those batteries every few years. My house is full of TrippLite isobar units
    Last edited by ashiekh; 06-20-2018 at 03:11 PM.

  10. #20
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    Put the UPS back to normal mode. Your PSU is NOT subject to voltage fluctuations.
    Rest in peace Mike Clements, aka "Yellowbeard"

    Rest in peace Joerg Theissen, aka "GI Joe"

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