PC Peripherals Huge huge problem with Microtek 1KVA UPS

C

clown_abhi

Skilled
Hey guys,

I bought this 1KVA UPS sometime around 25th October.

The first time, i charged it for 10 hrs. Then started using it and the first power cut - the PC reboots. So, didn't try anything and was so pissed off that i raised a complain with Microtek.

The service was prompt and the service guy came in the next day, tried stuff and everything working fine. But then again after he goes off, i try switching off the power and the PC now shuts down.
Thereafter follows a series of 5 complaints with 8 engineer visits, MOSFET blast inside UPS, 3 new replacement 1KVA UPS, entire PCB change, diodes changed from New Delhi Service Centre, but at the end the UPS is still having the problem.

The PC just shuts down when the power is switched off. And this is not everytime. Its random. Sometimes it does and sometimes not.

I also have a APC 500VA, which works absolutely fine 24x7. Just dat it does not give backup & is out of warranty. I also have no idea how this 300W UPS is handling my 400W system with so much ease?

Can anybody in TE give some inputs to resolve this issue? Anybody in TE - Newbies, Experienced members, moderators or MOTMs or anyone :huh: Please help me :(
 
A 300 W UPS handles system with ease, as you are not using your peak power most of the time. Therefore you are fine with 300 W. However the problem with Microtek seems to be of fluctuation/voltage drop rather than load. To prove my theory, try starting PC only on UPS (1kv microtek) with no power, it would power on fine. However if you suddenly switch power off and switch to Microtek, it seems that the UPS is having a voltage drop and PC is shutting off. A good PSU or a new UPS should fit the bill. Ask them for a replacement.
 
Alternately, just get the battery of your APC UPS replaced and sell this off :p

You can usually just check the battery model, goto the nearest Exide dealer and ask them to get it for you :)
 
techcheat said:
A 300 W UPS handles system with ease, as you are not using your peak power most of the time. Therefore you are fine with 300 W. However the problem with Microtek seems to be of fluctuation/voltage drop rather than load. To prove my theory, try starting PC only on UPS (1kv microtek) with no power, it would power on fine. However if you suddenly switch power off and switch to Microtek, it seems that the UPS is having a voltage drop and PC is shutting off. A good PSU or a new UPS should fit the bill. Ask them for a replacement.
Click to expand...

I understand that i would not be using the max power most of the time. But the extreme power calculator shows the total usage ~ 400W on load. Even when the system is running of full load, the UPS is easily able to handle it.

The Microtek does sustain a cold start and also sustains sometimes even when i suddenly switch the power off. The problem is random. There is no fixed situation under which it happens.

PSU is currently a good one as in my siggy - VX450. so i guess that should not be a problem. The UPS has been replaced by them thrice as i have already mentioned but the problem still persists.
 
:ashamed: I guess it is the APFC problem that you are hit by. Corsair VX450 has APFC which require pure sine wave UPS, ur 1KVA microtek UPS is not pure sine one.
 
Me also thinking the same but the APC 500 is also not sinewave still it works fine. :huh:

Does anyone use this same UPS with VX450 in TE? Or what are other guys using with this PSU, some UPS which is less than 4k?
 
akiso said:
:ashamed: I guess it is the APFC problem that you are hit by. Corsair VX450 has APFC which require pure sine wave UPS, ur 1KVA microtek UPS is not pure sine one.
Click to expand...

clown_abhi said:
No voltage fluctations in ma house.
Once in a blue moon though, it does happen. The power is clean enough without surges and falls.
Click to expand...

The problem is the UPS itself: Its not pure sine wave. I will give you mine example:

I have 800 VA Pure Sine Wave Inverter -> Powersafe UPS -> vx450.

When the power goes off, the inverter starts its stuff, which the UPS allows to pass through, the 450 on the other hand doesnt mind it and continues on. In your case the 450 is not accepting it.

~LT
 
If the VX450 is not accepting the power transition in Microtek UPS, how is it doing it in APC? :huh:

Say, if i buy a APC 650VA, will it have the same problem or will it be similar to the 500VA i have which works fine.
Moreover, sinewave UPS are costly, isn't it? I think the lowest would be even >5k...
Now thats a big disadvantage of buying VX450 if et all that is... :no:
 
Well guys, Microtek gave me the entire refund after working its a** to solve the problem and failing to resolve it.

Now, bought a APC 650VA and it works just fine. The problem seems to be with the Microtek.

No APFC funda here. It's just that Microtek 1KVA has some problem in its UPS which prevents it from working properly with a Corsair VX450 or rather ma PC...:p
 
:) It is good that ur problem has been solved, but man! this APFC funda is very confusing :no: sometimes it doesnot hold ground. As ur case have proved it. Technically if APC 650VA is working then Microtek 1KVA should also work. This issue is not complete solved in the forum.
 
Dats right mate.
I heard all over that APC has problem with Corsair VX450 but in ma case the Microtek has a serious problem contrary to the APC which works just fine.

And the buzzing sound is also non-existent on the 650VA but was in ma 500VA. Still, it was the UPS buzzing not the PSU as many reported.

Then this APFC stuff. Many suggest to go for the Smart - UPS. But i really think is that necessary if u have a active PSU. Well, I don't think so. Even a normal UPS would work. I think what matters is the transfer time or something like that. In the APC its like 5-10 and in the Microtek its like 15 or 17ms. Don't know but lets see whats the opinions of other guys on this. :)
 
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