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UPS stands for Un-interrupted Power Supply. An UPS has two sources of input power mains AC supply and DC battery. In normal operation the mains AC supplies the power and recharges the DC battery. When mains AC fails, AC is generated from DC battery and the UPS continue to supply power to the load uninterrupted. An UPS is a true power conditioner. The output of an UPS is free from harmonics, noise, spikes, abrupt variation etc. and the output waveform is sinusoidal. Different models from various vendors are available. Capacity of an UPS is expressed in volt amperes (VA). Models of UPS are available with capacity below 500VA with backup time between 5 to 30 minutes to capacity as high as 10 to 30 KVA or even more with backup time of several hours. An UPS is an essential power conditioning equipment for computers, servers, workstations, computer networking equipment, data centres, communication equipment, IT industry and sensitive and critical works like operation theatres, medical equipment like ECG, EEG, business cash registers etc. In domestic applications a common use of UPS is with PCs and UPS of below 1 KVA with backup time of 5 minutes to 30 minutes are very common. High capacity UPS has three phase input and large number of batteries. Normally 12 volt batteries are used as DC input. For high capacity UPS, DC input voltage can be multiple of 12 volt e.g. 48 volt, 180 volt, 192 volt etc which is obtained by connecting 12 volt batteries in series. Backup time depends on the capacity of batteries. For large backup time number of batteries are connected.
Basically there are three types of UPS
1. Offline UPS 2. Line Interactive UPS 3. ON line UPS Essential sections of an UPS are 1. Inverter unit 2. Battery 3. Battery charger 4. Transfer switch. OFF Line UPS An off line UPS is also known as Stand by UPS or Backup UPS and supplies emergency power when mains AC fails. The capacity of an off line UPS is generally below 1kVA. A very common application is with PC. In the event of sudden load shedding the off line UPS supplies emergency power to the PC so that work can be continued till normal power is restored or the PC can be safely switched off. In normal mode mains AC is directly connected to the output through a filter unit. The filter unit filters noise present in the mains AC. When mains AC fails the inverter converts DC power of battery to AC and transfer switch connects this AC to the output. This changeover happens very quickly but is not instantaneous and a time delay of few milliseconds is involved. This time delay normally does not affect ordinary load. Again when mains AC comes, the transfer switch connects mains AC to output. Thus the transfer switch keeps on changing connection of output to between mains AC and AC output of inverter. When mains AC is available, the charger unit recharges the battery. An offline UPS does not have provision for stabilizing the mains AC. Under voltage and over voltage of mains AC activates the power transfer switch and connects AC obtained from inverter to the output. Thus in case of off line UPS under voltage and over voltage of mains AC has similar impact as absence of mains AC. Line Interactive UPS In a line interactive UPS mains AC is connected to the output through a voltage regulating unit. The voltage regulator usually is an auto transformer with number of tapping and stabilizes the mains input by bucking or boosting as per requirement. A single unit called Inverter converter unit performs the functions of battery charger and inverter. When mains AC is available inverter converter unit charges the battery. When mains AC fails it converts DC to AC and supplies power to load. The transition is not instantaneous and time delay of few milliseconds is involved. Compared to Off line UPS, line interactive UPS performs better as the mains AC is regulated. Line interactive UPS are generally available with capacity between 750VA and 5KVA and are commonly used for computer network with small group of computer. ON Line UPS On line UPS are also known as Double Conversion UPS or True On Line UPS. There are two stages in it’s operation. In the first stage the mains AC is rectified to DC. There is a DC bus. DC bus can get power from both the DC battery and DC obtained by rectifying the mains AC. In the second stage DC power available from DC bus is converted to AC by the inverter and this AC is connected to the output. In normal operation output comes from mains AC via rectifier and inverter. When mains AC fail, output comes from DC battery via inverter. The changeover is instantaneous. There is no power transfer switch and hence no time delay. When a main AC is available normal operation continues and the rectifier recharges the battery. A bypass switch connects mains AC directly to the output in case there is some problem with the UPS.
Metal Oxide Semiconductor Field Effect Transistor (MOSFET) power transistors, Insulated Gate Bipolar Transistor (IGBT) devices, microprocessor ICs, Operational amplifier ICs, adjustable voltage regulator ICs, Oscillator and pulse width modulator ICs, GATE ICs, timer etc. are some the important components found in on line UPS.
On line UPS offer the best power protection against all types of disturbances. The output voltage of an On Line UPS is highly stabilized with typical value of tolerance of 1 percent i.e. the output voltage is between 227 and 233 volt and frequency is between 49.95 Hz and 50.05 Hz. The output waveform is purely sinusoidal. A typical modern on line UPS is equipped with protections against short circuit, over-voltage and under-voltage etc, MCB for input, output and battery, and has digital LCD display with facility for displaying input and output voltage and frequency, battery status, output power delivered and error codes and messages.
On line UPS models generally have capacity more than 5kVA. High capacity On Line UPS can be built for all possible requirements and battery backup time can be increased to suit particular need by adding batteries. Sophisticated On Line UPS are available with many advanced features and are highly reliable but are costlier.
An UPS is a complicated piece of equipment. Before troubleshooting an UPS of a particular model it is necessary to have detailed information specific to that particular model. Related literature and service manuals are very helpful.
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HEALTH TIPS HEALTH TIPS HEALTH TIPS HEALTH TIPS HEALTH TIPS HEALTH TIPS ATTENTION: FOR ALL INDIVIDUALS ESPECIALLY THOSE AGE 40 AND ABOVE. MEDICAL EXPERIMENT - MIRACLES WITH WATER Japanese Sickness Association has published the following experiment with WATER. They Claim 100% success for curing old and new diseases as follows: 1. Headache, BP, Anaemia, Arthrosis, Paralysis, Palpitation, Epilepsy and Obesity 2. Cough, Bronchitis, Asthma, and Tuberculosis 3. Meningitis and any other diseases connected with URINE and LIVER. 4. Hyper-acidity, Gastritis, Dysentery, Constipation, Piles and Diabetes 5. Any other diseases connected with Eye, Nose and Throat. 6. Irregular menstrual periods of women METHOD OF TREATMENT AND MAINTENANCE: 1. Wake-up early morning and drink Four(4) glasses (160ml each) in an empty stomach. Thereafter, no solids or liquids should be taken up to 45 minutes. 2. Normal breakfast can be taken after the 45 minutes time elapsed. 3. Nothing either liquid or solid should be taken for Two(2) hours after breakfast, the same as with Lunch and Dinner. 4. After Dinner nothing should be taken before bedtime or sleep. Sick and old people will find it difficult to drink Four(4) glasses of water at an instant in the beginning, but, can increase gradually to the recommended level in a short time period. Experiment has proved that the following diseases have been cured on treatment of water for the period shown against them a) Hypertension - 30 days d) Constipation - 10 days b) Gastric Problems - 30 days e) Cancer - 6 months c) Diabetes - 30 days f) Tuberculosis - 3 months Those who suffering from Arthritis should try this experiment three(3) times a day for one(1) week and thereafter reduce to once in the morning. For first few days you may experience to pass urine more than the norma, but no side effects. THIS WILL CLEANSED YOUR BODY OF IMPURITIES AND WILL PREVENT MANY TYPES OF DISEASES... EXERCISE RELIGIOUSLY... AS THE SAYING GOES "HEALTH IS WEALTH" REMEMBER:
70% of our body is made up of water...
only 30% of our body is solid...
HEALTH IS WEALTH...
WHAT'S THE USE OF HAVING A BILLION
BUT LYING IN A BED - SICK
OR SUFFERING FROM AN ILLNESS.....
I WOULD RATHER HAVE A CLEAN BILL OF HEALTH FOR A BILLION.
WHEN YOU REACH THE AGE OF 35 EXERCISE IS A MUST...
WATCH YOUR DIET...
EXERCISE DAILY AND RELIGIOUSLY
TAKE YOUR MULTIVITAMINS TO SUPPLEMENT YOUR FOOD INTAKE....
THE BEST THINGS IN LIFE ARE FREE.....
FAMILY....RELATIVES....FRIENDS....HEALTH and most importantly TIME....
YOU ARE MORE BLESSED THAN OTHERS...
WHEN YOU HAVE BOTH YOUR EYES SO YOU CAN CLEARLY SEE
OTHERS HAVE ONLY ONE...OTHERS ARE TOTALLY BLIND...
WHEN YOU HAVE BOTH YOUR EARS SO YOU CAN CLEARLY HEAR
OTHERS HAVE ONLY ONE...OTHERS ARE TOTALLY DEAF...
WHEN YOU HAVE BOTH YOUR HANDS SO YOU CAN HOLD THINGS WELL
OTHERS HAVE ONLY ONE...OTHERS HAVE NONE...
WHEN YOU HAVE BOTH YOUR FEET SO YOU CAN WALK EASILY
OTHERS HAVE ONE...OTHERS HAVE NONE..
WHEN YOU STILL HAVE YOUR PARENTS...
OTHERS HAVE ONE...OTHERS HAVE NONE...
WHEN YOU HAVE CHILDREN...
OTHERS HAVE ONE...OTHERS HAVE NONE...
WHEN YOU HAVE A FAMILY...
SOME HAVE NONE...OTHERS TOTALLY ORPHANED
WHEN YOU ARE LIVING IN THE PHILIPPINES...A DEMOCRATIC COUNTRY..
THE WEATHER NOT THAT EXTREMELY HOT NOR COLD..
WERE PLANTS AND TREES GROW EASILY
SURROUNDED BY SEAS FULL OF FISHES AND NATURAL RESOURCES
WHEN YOU ARE OLD AND STILL LIVING WITH YOUR CHILDREN
IN SOME COUNTRIES OLD PARENTS AND PEOPLE
ARE LEFT IN THE "HOME OF THE AGED NURSING FOUNDATION"
WHEN YOU STILL HAVE YOUR JOB...WORKING IN AN AIR-CONDITIONED
ROOM..JUST CONSIDER THE CONSTRUCTION WORKERS DOING THEIR
HARD LABOR JOBS UNDER THE HEAT OF THE SUN...IGNORING THE
DANGEROUS ELEMENTS CONFRONTING THEM....
COUNT YOUR BLESSINGS...COUNT THEM ONE BY ONE...
DON'T THINK OF SAYING ANY UNKIND WORD...
THINK OF PEOPLE WHO CAN'T SPEAK,
DON'T COMPLAIN ABOUT THE FOOD YOU EAT,
SOME HAVE NOTHING.
DON'T COMPLAIN ABOUT LIFE,
PAINT A SMILE ON YOUR FACE
AND THANK GOD YOU'RE ALIVE AND STILL AROUND
LIFE IS A GIFT......
LIVE IT WELL......
SAFETY 1ST
REPEAT BUSINESS 2ND
PRAY ALWAYS IT WORKS!!! ATTENTION: FOREIGN ELECTRICAL MANUFACTURERS AND ELECTRICAL DISTRIBUTORS OUR COMPANY WELCOMES ELECTRICAL FOREIGN SUPPLIER/MANUFACTURER/S
WHO WOULD LIKE TO OFFER THEIR PRODUCT LINE
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MEANING PAYMENT WILL BE FOR A CERTAIN PERIOD...EXAMPLE SIX(6) MONTHS TO ONE(1) YEAR,
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AND WE WILL JUST PAY FOR THOSE SOLD ITEMS YOUR COMPANY WILL BE SHOULDERING THE FORWARDING/FREIGHT COST
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CONTACT,EMAIL OR CALL US IF YOUR COMPANY IS INTERESTED WITH OUR OFFER...
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FROM THE BOTTOM OUR HEART...THANK YOU FOR THE SEARCH ENGINE OPTIMIZATION
THAT OUR COMPANY IS GETTING...
MAY THE GOOD LORD BLESS YOU AND YOUR COMPANY INCLUDING THE MANAGEMENT AND STAFF...
GOOD HEALTH...LONG LIFE...AND A MORE FRUITFUL YEARS AHEAD NOT TO MENTION
INCREASING AND GROWING BOTTOM LINE FOR THE COMPANY....
FOR THE THE BEST AND NUMBER ONE SEARCH ENGINE COMPANY IN THE WORLD
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Friday, December 27, 2013
UPS...WHAT YOU SHOULD KNOW...FOR YOUR PHILIPPINE ELECTRICAL CONCERNS...NEEDS...INSTALLATION...QUOTATION...ORDERS KINDLY EMAIL US: SAFEELECTRICAL1997@GMAIL.COM
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