UPS(Uninturruptable Power Supply) Problems

ruprajbhatt · Jun 10, 2014

Hi i have a su-kam UPS and whenever there is a power cut my computer turns off or restarts and the ups shows red light. I have the following configuration-
Intel Core i5 4440 Processor
Gigabyte H87 motherboard
AMD Radeon R9 270 graphics
8gb ADATA RAM and A Antec 550W PSU. Please suggest me what to do to solve the problem??????????
Also it happens maximum when i play games. Whenever there is a power outage and i am playing game the UPS shows red light and turns off the computer. in serious problem. please HELP ME!!!!!!

ss202sl · Jun 10, 2014

Sounds like the battery in the UPS no longer holds any charge, and can't provide power to the computer during a power outage.

replace the battery in the UPS.
or
replace the UPS.

maktovic · Jun 10, 2014

Is the UPS Battery fully charged? What is the rating of your UPS's battery(How many VA, Watts)

You need a UPS with bigger battery. Your current UPS's battery is not enough to power your system

If it happens during games(which means at load) then I'm pretty sure that the Battery of UPS is not enough.
You'll need atleast 600VA battery for your system(CPU+ Monitor).

ruprajbhatt · Jun 10, 2014

I think its a 600VA Su-kam UPS. @ Maktovic

maktovic · Jun 10, 2014

Then likely it is not of a good quality or too old.

A 600VA battery is sufficient to power your PC+Monitor at load and will provide about 3-5 minutes during power outage

ruprajbhatt · Jun 10, 2014

But its not doing that it immediately restarts my computer or just keeps the red light on and the computer remains off completely. Ah well. what will you suggest to buy. please mention a good quality UPS with high output@ Maktovic.

ko888 · Jun 10, 2014

What is the model and model number of the Su-Kam UPS?

What is the model number of your Antec PSU?

ruprajbhatt · Jun 10, 2014

Su kam Ups is a 600VA office manager UPS and Antec Psu model is VP550P. @ k0888

maktovic · Jun 10, 2014

There can be few reasons behind it
1. Battery is not of decent quality
2. Battery's life is expired
3. Battery not fully charged

ruprajbhatt · Jun 10, 2014

OK Matkovic i understood that. as you are a power supply expert so can you suggest me a good Decent UPS to buy??

maktovic · Jun 10, 2014

APC Back-UPS 600VA
http://www.amazon.in/gp/aw/d/B00G0NWXWY/ref=pd_aw_sbs_1?pi=SL500_SY115

Microtek 800VA UPS
http://www.amazon.in/gp/aw/d/B009CVTZCM/ref=redir_mdp_mobile?refRID=15PCR8QQ0C4G5X8QPB4X&ref_=pd_sim_sbs_e_2

Both are good units. Both perform AVR(Automatic Voltage Regulation) which extends battery life.
For your build, to be on safe side stick with Microtek 800VA for longer backup time.
APC Back-UPS 600VA will also be fine and for your system which consumes 250-300W at load, will provide a runtime of 3-5 minutes when battery is full charged (sufficient for safely shutting down Windows).

ko888 · Jun 10, 2014

ruprajbhatt :

The PSU's hold-up time is too short due to the primary electrolytic capacitor having too low of a capacitance value. This will not allow the minimum 17 milliseconds, as required by the ATX12V Power Supply Design specifications, to be met so that the UPS has sufficient time to switch over to battery backup mode during a power interruption event (i.e. the PSU will have already shut down before the UPS has had time to switch over to battery backup mode).

Another cause may be an incompatibility between the PSU's Active PFC circuit and the UPS' Quasi Sine Wave output when operating on battery power. When the UPS attempts to switch over to battery backup mode, during a power interruption event, the incompatibility will cause the UPS to report an overload condition and shut itself down.

maktovic · Jun 10, 2014

But that's not the case here. The SU-Kam UPS is not really a good quality one.(Response time of UPS to switch to battery durnig power outage is high.)

I've used the APC Back-UPS 600VA (the one in the link) with a mediocre PSU of hold-up time 14ms and PFC value of 0.9( CoolerMaster Thunder) without any problem, the UPS provided back-up during power outage.

The Antec VP500P is much better in terms of quality than CM Thunder PSU.

Either the Battery of UPS is dead or not of a decent quality failing to provide its rated output

I will suggest the OP to choose 600VA or 800VA UPS from APC.

ko888 · Jun 10, 2014

The hold-up time of the Antec VP550P is 8.3ms. That's less than half that of the required ATX12V spec of 17ms. How is that better than the Cooler Master Thunder?

ruprajbhatt · Jun 14, 2014

if the hold up time is problem.. then why not the shut down or restart process happening during normal usage. it only occurs when running games or doing video works that means during load period only. and does really hold up time make a big difference?

maktovic · Jun 14, 2014

This truly proves that the problem is with UPS's battery and not with the PSU. Hold up time means the amount of time a PSU can power the system during electricity outage and it does matter and greater hold up time signifies better quality of capacitors.
Getting a better quality UPS will solve your problem

ruprajbhatt · Jun 14, 2014

I think a good UPS has switch over time of only 3mili sec and that would be sufficient to for the psu to retain the power??

maktovic · Jun 14, 2014

Generally line-interactive UPS have 5ms of switch over time. For your PSU anything below 8ms of switch overtime will be sufficient.

There are more low quality PSU's that have very low hold up time but work fine on a good quality UPS

Note that your UPS's switch over-time & PSU's hold-up time is not the problem since your PC shuts down only during load, the battery is the one responsible, not providing sufficient power to run your system during power outage when system is at load.

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