Static Switch

Please explain in more detail. Do you have the two UPS's connected together?

A good UPS will self test on a regular basis. The self test will alert you as to when the battery is unable to support the load.

The self test may not be a very good indicator if you have a small load (i.e. oversized UPS). In order to obtain a better evaluation of your UPS, make sure you are loaded to about 80% of the rating and then do the self test.

If the charge in the battery drops to 40% or less, buy a replacement battery that day and replace it when it is delivered to you.

You won't find this advise on any printed literature. It comes from practical experience.

If you are looking for a way to keep power on when the UPS dies, you will need to describe that concern in more detail. Otherwise, expect to replace the batteries, about every 2 to 3 years.

thank u for quick response

1-two ups connected through change over switch(i got one ups supply output)

2-if i want to change one ups to another after particular period it makes one interruption

3-if static switch is there then i can avoid this interruption

4-now u understand the things

So why are you coming here instead of picking up the telephone and talking directly to the UPS supplier(s)?

hello boss jst read my question(i ask about the supplier/manufacturer any body related to the product),i think u r not a technically qualified person ,see ur posts are like criticizing the questionnaire.please ask u need any data

When utility changed the feeders by quick acting changeover system in a data centre once a UPS failed,they suspected surge, but manufacturer said SPD is incorporated. Can it happen due to unexpected delay in changeover of feeders.What is the safe time period withinwhich changeover should take place so that data won't be lost?.

It's a good thing I place no value on mere opinions, then.

Yes well, for someone who is having twins, you'd think OP would be more knowledgeable of the process.

And how to use the telephone to navigate towards a solution.

You need a Zorro crossing switch driven thing.

It sounds like you need some special circuitry to provide this function.

Many UPS manufacturers use a microprocessor to monitor the AC line so that switching time can be kept to a minimum. Zero crossover circuits are frequently employeed to make the switch at a time where the voltage is zero plus or minus a few volts. Using that characteristic of AC power makes it easier to switch at a point in time where the damage is least likely to occur.

So you may have an interruption for up to 8 mSec (at 60 Hz) but you won't notice it. Not every UPS is this fast. It would be useful to understand what you are trying to keep running during the switch over. Your best solution may be much simpler than using some expensive microprocessor driven zero cross over device.

It is likely that what you are trying to keep alive during the power interruption operates on DC power that it takes from the AC line. Really all you need to worry about is making sure that DC power is always available to your critical load. For that all you need is a DC battery that provides nearly the same voltage that the DC power supply uses. A diode between your battery and the power supply will insure that current only flows in one direction. If you do it right, you could keep your critical load operating for several minutes while someone moves a plug from an exhausted UPS to a standby UPS. That move might even be acomplished with a switch.

Again, more information would be necessary to make an appropriate recommendation. If it was simple, you wouldn't be asking.

Hai everybody,

Finally i got result from Havells

Automatic Transfer switch (ATS)

From Havells,Model :Instaline Automatic Transfer Switch

Automatic/Manual with inbuilt Time Delay

I not want to hurt anybody,the way of giving answer is not"why u r coming here"like this.

i really thanks to NotUrOrdinaryJoe who tried the answer for my question

why don' you post Havells ATS-instaline literature.

An ATS is not a static switch. There will be a larger momentary interruption if you utilize an ATS in your design. This can be significant for some sensitive loads.

It's true that most large UPS' has static switches built into the front-end of the unit. I am not sure about your smaller unit. I have worked with Emerson, APC, and Powerline units of varying sizes and the static switch was an option for all.