UPS uninterruptible power supply information

newsletter of adriatic Power

2010-03-30T04:31:00.000-07:00

www.adriaticpower.com

Uninterruptible Power

Does this sound familiar?

http://www.dawn.com/wps/wcm/connect/dawn-content-library/dawn/the-newspaper/editorial/the-power-crisis-930

Check it out. It makes interesting reading..

Here is some basic information about different types of UPS

Line Interactive UPS

These UPS's are similar in design to the Offline or standby UPS except that they have the following additional features:

They have the means to stabilise the output voltage by lowering the voltage when the input is too high and increasing the voltage when the input is too low.
They have an input filter which allows the UPS to clean up the noise generated on the input waveform.
Advantages of this system over an on-line UPS:-

Smaller
More cost effective
Cooler
Quieter
Lighter
Robust
Disadvantages over an on-line UPS:-

Less accurate output voltage
Less accurate ouput frequency
Less able to clean up noise on input waveform
They have a small break in power when switching between voltage levels or between mains and battery backup (inverter)
These units can be designed for long backup times and in sizes up to 20Kva.

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It is not easy to make power protection interesting, so if you are not that interested, don't hassle, just call us out and we can give you all the advice you require.

Offline/standby
UPS
The offline or standby UPS has only the basic features. The protected equipment is connected directly to the mains power and therefore "sees" the same raw voltage and waveform that the utility produces. At the same time, the UPS charges the battery. There is normally a small transient suppressor that can clamp the voltage above 275 volts. When the incoming mains reaches higher or lower than the designed switchover voltage, the UPS runs from the battery via the built- in inverter. When the mains returns to normal, the Ups switches back to charging the batteries and supplying raw mains to the equipment. Although there is a switching time between mains fail and the inverter switching on, this is tranparent to the user as it is vey fast, typically quicker than 25 milli seconds. These units are available in long runtime applications.

Advantages:

Cost effective
Small
Light
Effeccient
Cool
Disadvantages:-

No filtering of mains waveform, input and output are the same
No stabilising of the input voltage
No stabilising of the frequency
Switching time up to 25mS
These units are ideal where there is no real problem with the quality of the power, but the power does fail from time to time.

Adriatic Power - contact details
Cape Town Gauteng
phone: 021 981 6645 011 824 4470
fax: 021 086 659 2467 011 690 3384
e-mail: shane@adriaticpower.com peter@adriaticpower.com

I started a UPS manufacturing company in 1992

2009-11-13T04:44:00.000-08:00

“I started a UPS manufacturing company in 1992, spent 2 years improving the UPS and did it so well that the units are still supporting critical installations. Manufacturing is not an option anymore, but we were careful when we first imported the current range in 2003 and you can have the same reliability by calling us for your UPS requirements or UPS service requirements”

http://www.adriaticpower.com

peter@adriaticpower.com

On a hill in Swaziland in 1996

2009-11-13T04:41:00.000-08:00

On a hill in Swaziland in 1996, a customer of ours installed an automatic voltage stabilizer. Our core business is UPS (uninterruptible power supply) sales and service, but in order to satisfy our customer, I sourced the voltage stabilizer. I didn’t realize that I would also have to commission it on a hill in Swaziland. I had to get there in a 4x4 bakkie. Since then I have made enquiries as to the voltage stabilizer’s health, and it is still working. Since 1997 we have imported a full range of single phase and three phase automatic voltage stabilizers (AVS). With excellent results.

You are probably wondering why you should want or need an AVS. There are several reasons, including:-

1. If your UPS’s are using the batteries when the power is present (beeping occasionally), your voltage is out of range of your UPS’s and the AVS will solve that if installed between the utility connection (Escom in our case) and your UPS’s.

2. If you have surge arrestors installed in your distribution board (DB), but you are still losing devices and/or equipment. The problem is probably caused by sustained or long high or low voltage and the AVS will solve this.

3. You require a constant voltage for your process or plant such as plastic welding, printing etc and the AVS will give you this stability.

The advantages of an AVS are among others:

Very reliable over a long term

Very efficient and has no power devices

Runs cool

Relatively inexpensive

www.adriaticpower.com

What experts don’t want you to know about UPS’s (uninterruptible power supplies)

2009-11-09T23:31:00.000-08:00

On-line UPS’s use power to charge the battery and then operate the inverter.

This power is paid for by you the user of the UPS.

This power, used by the UPS to protect and support your computer and equipment is between 5 and 20 % of the power used.

A line interactive UPS uses less power, because the inverter does not operate unless there is a power failure.

A line interactive UPS is generally cheaper than an on-line unit in price and in running costs.

A line interactive UPS is generally smaller than an on-line UPS,

An on-line UPS has a more stable output than a line interactive unit.

Most modern on-line UPS’s do not have isolation between the input power and the output power.

If the input is not isolated from the output, the equipment connected to a UPS can be affected by noise and distortion of the neutral line.

Most equipment including PC’s do not require a sinusoidal (sine) waveform as the power supply converts the waveform to DC (direct current).

Batteries are an essential part of any UPS system and should be replaced every 3 to 5 years (depending on supply conditions, this could even be sooner) unless the batteries are rated at a higher life expectancy.

Sometimes it will cost 60% of a small UPS’s cost to replace the battery, but this could still be worth doing due to the higher specification of the replacement battery.

www.adriaticpower.com

peter@adriaticpower.com