UPS Connection

I can't think how you could have resonance problems with that set up...?

Does, I suppose, depend on what sort of regulator and UPS output you are using though...

You might have problems if the regulator is some form of saturated transformer type?

John.

It's perfectly likely that you can produce nasty resonances by connecting a regulator to a UPS, if the UPS is based on switching technology, and if there is substantial length (inductance) in the wires between the two. At least that's been my experience with DC power supplies.

As Electroman said, doesn't it depend on the type of regulator? Also, doesn't a decent capacitor on the regulator input fix it?

yes, and in most cases.

Hello INCOBAR,

Most good UPS's actually include a Voltage Regulator, which compensates for low or high Voltage input levels from the Mains into the UPS.

Now, think about it logically, if you put a second Voltage Regulator in Series with the one in the UPS, you are going to get both of them "hunting", (alternately swinging Voltage up and down), and thus resonance problems as the voltage swings become more violent.

If you already use a UPS, check what type you have, before trying the "Voltage Regulator" external in series thing.

If you have yet to purchase a UPS, ensure you do get a unit with integral Voltage regulator, capable of dealing with "brownouts" = Low voltage, plus excess Mains voltage too, as although that type are more costly, you do get what you pay for.....

Since I absolutely agree with SparkStation on this one, All I can add is why would you consider doing putting a voltage regulator on the output of a UPS.

A UPSs mission in life it to filter and regulate your power supply.

If it doesn't, it needs to be repaired or replaced.

Hi Incobar,

May I ask you, why you connect Voltage Regulator to UPS? And In what conditons are?

Can you tell me, What type is your UPS, e.g. Standby, Line-Interactive, Duo-conversion online,...?and What purpose is it?

After you answer those above questions, you will find out your answer yourself.

Good luck.

The regulator is connected in the main utility supply to provide voltage regulator to the builidng, the ups is connected to support several pc´s, the type of ups is on line...regards

Hello again INCOBAR,

Thank you for your feedback, so good to have please accept this fine

There should be minimal regulator "hunting" in your situation.

The UPS powering several common PC's will not "reflect" back sufficiently as to interfere with the AVR controller at the building supply.

In saying that, I am allowing for other various electrical loads in the building: power, heat, light etc, and that you do not have computer connected load of more than 25% of the total building load.

As the Computer load increases towards the building's input AVR's output, is when you are likely to have problems, which would further increase in an escalating manner once you are past the UPS with the connected combined computers using 50% of the total building load.

Kind Regards....

Hi Incobar,

Thanks for your feedback.

First I am sorry because I must to ask you some questions again.

How long was your system: VR, UPS, PCs operated? And until now are there any problems?

I suggest that your system is operating well now. If so why you must worry about the resonance. I like some one's slogan: "The experiences are ......"

And now we return back to your questions. I don't know really the exist of resonance in your condition. And It is a problem of UPS manufacturers, because their responsibility is must to supply product with best quality to consummers.

UPS is battery backup with an inverter circuit and I suppose that there is resonance between AVR and UPS, that resonance will not be effect to UPS output.

Good nice weekend.

Yes, but remember that he said his/their's is an on-line (not battery back-up) UPS, meaning: it's a mains backup (for recharging) supply type, outputting from battery-inverter at all times. This suggests (meaning, I'm not positively sure) that UPS-internal VReg, if present, should occur at UPS regulated/protected outputs--downstream of the inverter; and UPS input (house) regulation (seems to me) should have beneficial effect, if any, supplying the UPS's battery charger. Assuming normal mains (no blackout, surges or sags)--or even not if the house regulator has its own, off line backup--it seems to me that the UPS battery might be considered (if not as decoupler then) as a "buffer" between house regulation and UPS-integral output regulation insofar as any resonance effects are concerned. What do you all think?