UPS Backup Issues

[BillP]

Hi all,

So I have a bit of an issue with my backup that I may need some help figuring out. I had to relocate to India about 5 months ago due to family issues. But as I am in school I also needed to bring my desktop to India as well. I purchased the UPS Pro 1500 as it was more than enough to handle my desktop. However, my desktop powers off as soon as the power goes out and it does not seem to trip the fuse. I also purchased a power converter of 500W as my desktop only functions at 200W-300W. If anyone has any suggestions or ideas for me to fix this please let me know. 

[Anonymous user]

Is the power converter on the AC output of the UPS and is the Desktop connected to the converters output?

Does the desktop have an Active Power Factor power supply?  It may have a label or sticker on it indicating it has Active Power Factor features.

Check your USPs information sheet. I believe it has a Stepped approximation to a sine wave output.

Active Power Correction Power Supplies. Do not like that type of AC wave and can trip an UPSs overload circuit and shut it down. When trying to run on battery backup. Even though the load is not higher than the UPS ratings.

If the UPS is connected to the converter and it is powering the Desktop. It also could be triggering the UPSs overload circuit.

Does the UPS have a indicator or display showing a overload was sensed?

You may need a UPS with a pure sine wave output.

[BillP]

The ac output is connected to the converter yes. I have also tried using a surge protector in order to convert just ports from US to India. My apartment also international sockets installed I don't know if it will make a difference but my PC does power on if I connect directly into the apartment socket. Really lost on the issue here cannot think of a fix except replacing my psu. 

I do not believe it does. Toughpower Grand RGB 850W Gold Full Modular (thermaltake.com) is the one I have been using.

There was no sign showing it was overloaded it was functioning normally without any form of indication. I also tried to do a test through powerchute and it ended up shutting my computer down. 

[Anonymous user]

India is 230 Volts 50 Cycles. Is the UPS made for that AC voltage input?

The power supplies web pages says it has Active Power Factor Correction.

When the UPS switches to battery backup. The modified sine wave output probably causes the supply to try and correct the AC. It probably is giving a strong power surge and tripping the USPs over current shutdown.

I have seen others with a similar problem. The cure many times is replacing the UPS with one that has a pure sine wave output. So it does not trigger the supply trying to correct the AC.

Most supplies being sold these days have some type of power factor correction. So trying a different brand may or may not help. The efficiency  rating on a supply should indicate how efficient it is and if it may have Active Power Factor Corrections features.

[BillP]

It is made for that AC voltage. The only thing I can think to do is get a new PSU for India and try with that instead.

[Brad_C · Accepted solution]

On 17/4/2021 12:52 AM, kunal said:

It is made for that AC voltage. The only thing I can think to do is get a new PSU for India and try with that instead.

That PSU is perfectly fine for India, you just need a mains cable with the appropriate plug on it. I have seen modified sine-wave UPS have issues with Active-PFC power supplies. As mentioned previously, a sine-wave UPS is generally the answer for that. Another work-around might be a cheap and nasty PSU that doesn't have active PFC.