An Uninterrupted power supply (UPS) is a system intended to solve the mains disturbances and mains failure. The batteries attached to the UPS enables the user to work during mains failure. This is done by putting the UPS between the mains and your computer.

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The Block diagram of inverter is shown:

LINE INTERACTIVE
The true LINE INTERACTIVE design is in fact a combination of OFFLINE & ONLINE, in which the inverter plays a dual role of charging the battery when mains supply is present as well as regulating the output voltage and working as a normal inverter in absence of mains supply, so to the user it appears like an ONLINE System. Line Interactive UPS offers enhanced power protection over the basic Offline designs by providing additional line conditioning.

ONLINE UPS
An ONLINE UPS is the one in which the inverter always supplies power to the protected load and hence the same quality of power is ensured all the time. When mains supply is present, the inverter derives its power from thee mains supplied rectifier and the backup batteries are also kept in charged state. When the mains fail, the source of DC power for the inverter section shifts to the battery without any break whatsoever in the output to the Inverter. It also bears all the vagaries and noise borne out of the mains supply and insulates the secure bus supply from it.
An ONLINE UPS is especially useful for sensitive and critical equipments/devices.

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 As an experienced & conscientious computer user, you have faith in the dictum GIGO and you take precautions to see that 'garbage' doesn't enter your system through software. But there is one more source of garbage, of a more serious nature, which is not normally taken care of. That is in the form of garbage power input to the computer. It is more serious because besides malfunctioning and operation problems it can also cause permanent damage to your computer.

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Most certainly. A number of devices in various computer installations are studied, information is collected from device manufacturers and after taking all this into account the system is designed. Su-Kam has been doing this work in close co-operation with experienced people from computer application and computer maintenance fields. Therefore Su-Kam is in a position to offer its users a unique advantage over others.

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There are three ways in which we approach this.
Check the plate at the back of the equipment near the mains onlet. It will usually give a figure in watts(w) or Amps(A). If in Amps, multiply the line voltage by the figure given to arrive at a VA (Volt-Amp) rating add 25% which is what UPS are rated in.

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Battery selection depends upon the back up time required which in turn depends upon the frequency of power failure, average programme length and the presence of other back up source like a diesel generator set. One thing to remember is that the ampere hour ratings quoted by battery manufacturers are on a ten hour discharge basis and normally the back up time required will be much shorter; sufficient either to finish an almost complete job or to take a systematic shut down or to start the generator set. However, when the battery is discharged in a shorter time a derating factor has to be used which incidentally does not vary below 20 to 30 minutes. So approx half an one hour is a sensible back up time to select.

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Battery life is halved for every 10 degrees Centigrade temperature increase above it's specified operating temperature (usually 25 degree Centigrade).

UPS batteries are designed for maximum life in 'typical' use i.e. long periods of continous low charge and occasional minor discharges.

At installation time, the battery is at 100 percent of rated capacity. Each discharge and subsequent recharge reduces the relative capacity of the battery by a small percentage.The length of the discharge cycle will determine the reduction in battery capacity.
So-called deep discharges on a repeated basis will reduce the life of the battery.

The loaf of "bread" analogy is most often used to illustrate the relationship between cycling and battery life. A loaf of bread can either be cut into many thin slices or a few thicker slices. Similarly, a UPS battery can provide power over a large number of short cycles, or fewer cycles of long duration.

The IEEE defines "end of useful life" for a UPS battery as being the point when it can no longer supply 80 percent of its rated capacity in ampere-hours. The realationship between amp-hours and load protection time is not linear, a 20% reduction in capacity results in a much greater reduction in protection time. For example, a UPS battery that supports a full load for 15 minutes when new, will support the same load for only about 8 minutes when it reaches its defined "end of life".

When your battery reaches 80% of its rated capacity, the aging process accelarates and this is the time when the battery should be replaced.

No UPS battery will last forever - even one that experiences minimal use.This is because UPS batteries are electro-chemical devices whose ability to store and deliver power slowly decreases over time.So, even if you follow all the guidelines for proper storage temperature and maintenance, you still must replace them after a certain period of time.

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As long as the batteries are fully charged when the unit is switched off they will not require charging for three months.

Cold start feature of Power Pack Line Interactive UPS isolates the batteries from the UPS circuit and thus the UPS can be switched off for longer period (six months approx.) without damaging the batteries.

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One is right when one says "similar". The reason is that the equipment manufactured by Su-Kam uses pulse width modulation technique with transistor/ IGBT/ MOSFET as the basic inversion element.There is no chance of the fuse blowing during sudden load application due to commutation failure. That means less down time and assured power supply. Due to PWM technique the size of the filter is also small which further improves the dynamic behavior.
We guarantee an inversion efficiency of more than 90 - 92% . High efficiency also results in smaller size. Our equipment is the smallest for a given rating, it occupies minimum floor space and can be installed very easily. A very generous design imparts tremendous short term overload capacity to our equipment which is essential to take care of large inrush and surge currents demanded by computer devices.

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CRITICAL NON-CRITICAL SYSTEM

UPS1 & UPS2 deliver power to the critical & non-critical loads respectively under healthy conditions. UPS1 synchronizes with UPS2 & UPS2 synchronizes with the bypass. In case of a critical inverter failure, critical load works on UPS2 through enabled STSW1, simultaneously transferring the non-critical load to Bypass by activating STSW3 & inhibiting STSW2. The restoration of the critical inverter will be responsible for retransferring the loads of their corresponding inverters. The batteries are charged through their corresponding rectifiers.
Truth Table:

b STSW1 STSW2 STSW3 Result UPS1 & 2 healthy OFF ON OFF Critical load on UPS1 Non Critical load on UPS2 Inv.1 trip & UPS2 healthy ON OFF ON Critical load on UPS2 Non Critical load on Bypass Inv.2 trip & UPS1 healthy OFF OFF ON UPS2 handles entire load

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Online UPS provides better overall power protection to your computers and peripherals. This protection includes power conditioning, regulated voltage and frequency and zero transfer time to battery during mains failure.

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Online UPS needs to be installed under supervision of a qualified technician.
Your supplier of JET Online UPS can install it for you.
Su-Kam also provides necessary assistance to your electrical contractor.

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Every UPS needs to be serviced every 6 months to ensure its proper operation and battery condition.

We are proud of our reputation for customer service
We have a range of maintenance plans to suit every customer requirements from simpler repair to annual service contracts with guaranteed response time.

And every customer of Su-Kam has free access to our customer support.

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A pure sine waveform has a peak value, which is 1.414 times the RMS value indicated on a voltmeter. A resistance or any linear load connected to such a voltage source draws currents having similar waveforms and hence has a crest factor of 1.4. As against this, the non-linear loads as described above may demand currents whose peak value to RMS ratios are 2 to 5 or more. This ratio of peak to RMS is termed as the crest factor, and is indicative of the degree of non-linear load handling capability of the UPS.

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A regulated voltage source such as inverter section of ON-LINE UPS is expected to maintain the voltage at a predefined level, irrespective of changes in supply, 1.e. DC input voltage or load current levels. The percentage deviation of the output, as a result of load or dc input change, after the output voltage has settled to a new level is defined as the static or steady state regulation.

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The percentage deviation of the output from its steady state value immediately following a disturbance such as sudden change of DC supply voltage or load current is termed as dynamic/transient regulation. This deviation is generally much larger than the steady state value specified as voltage regulation, and incidentally is a measure of the speed of response of inverter control system. Since by defination this is a transient quantity, not only the deviation but the time to bring the voltage back to the steady state regulation level is also an important index of performance. Su-Kam's Online UPS have the Dynamic Regulation on Output voltage.

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