UPS power goes off instantly as soon the external supply stops.
I have a V-GUARD UPS (UPS-50E) which I have been using along with my computer for a quite long time. For a few months, its not giving me the stand by power to switch off my machine safely and the power goes off instantly when the external supply ends. I had a battery replacement couple of years back. What could be the reason for this to happen? I tried hooking the UPS to the wall power outlet for a long time and it didn't help. Even the "Backup Battery Low" indicator is not flashing when the UPS is switched on. Please can you advise any steps that I can execute towards resolving this?
Re: UPS power goes off instantly as soon the external...
In our office, I have had to replace UPS batteries AGAIN two years after I replaced the original batteries in the units. I had purchased the replacement batteries locally, so I don't know if the brand of replacement batteries was not as good as the original batteries or what. But your weak battery light is not flashing ... I would try a replacement battery (if it isn't too expensive) but I know that some of the older batteries are no longer used in the newer UPS units so if the problem wasn't the battery you are stuck with a new battery and nothing to use it for.
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We all use many devices and equipments that run on electricity. For all these to function properly they need uniform power supply (constant flow of electricity). As the electric supply in many countries is not uniform there is a need for a device to correct it. There are many such devices available in the market today. For example UPS (Uninterrupted power supply), Voltage Stabilizer, Constant Voltage Transformer are such devices available today.<br />
<b><u>Why buy a UPS?</u></b><br />We can never guarantee that we will get constant power. The power supply always has fluctuations. Surges, Spikes, Brownouts, Blackouts and Noise can damage your electrical appliances especially your computer. To prevent this from happening you need a device that does power conditioning. Electricity has to be uninterrupted. If the voltage is higher than the specified level then it is 'Over Voltage'. If the voltage is lower than the specified level then it is 'Under Voltage'. Both Spike and Surge come under 'Over Voltage' category. But there is a small difference between spike and surge. If there is very high voltage for an instant but comes back to normal immediately then it is called 'Spike'. If there is very high voltage for a slightly longer period then it is called 'Surge'. If the voltage is dangerously reduced to very low within a short period of time then it is called 'Brownout'. When this happens, the computer can be seriously damaged. If the power supply is totally cut then it is called 'Blackout'. Noise can mix with electromagnetic or radio waves or any signals. This is called 'Line Noise'. This may also reduce the voltage level to very low within a short period of time.<br />
<b><u>How can the UPS provide power when the main electrical supply is cut?<br /></u></b>A UPS has an internal battery. With this battery charger, an Inverter is also present. The inverter converts the 'Direct current' supplied by the battery to 'Alternatinc current' as required by the computer. When there is electrical supply the charger in the UPS charges the internal battery. When there is a power cut, the battery kicks in to supply the DC which is converted to AC by the inverter and power is supplied to computer.<br />
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<b><u>What if the battery loses its power?</u></b><br />When there is power cut, the required power is taken from the battery. Therefore the battery keeps losing its capacity. If the power supply comes back before the battery is depleted then the battery charger will start recharging, but if the power supply doesn't come back then the battery keeps supplying until it totally drains out. When the battery drains below a certain level the UPS sounds an alarm for your to shut down your computer and turn off the UPS. Some UPS' even have a built in system that shuts your computer down for you after a certain amount of UPS uptime.<br />
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<b><u>How long can the UPS provide power when there is a blackout?</u></b><br />This all depends on the specifications of the UPS and the requirement of the computer. A 600vA UPS for example can supply power to a computer with a 550W power supply for about 10 minutes or more.<br />
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<b><u>Tips for buying an UPS</u></b><br />The backup time of your UPS is the most important you need to consider. Other than that, you should know how many KVA (Kilo Volt Ampere) your UPS has. A computer needs atleast 0.5 KVA (500VA) to function. If you are planning to connect more than one computer to a single UPS then you need to get one with a higher KVA.<br />
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<b><u>What type of battery does a UPS use?</u></b><br />UPS uses <b>SMF</b> batteries (Sealed Maintenance Free). These type of batteries can be used for 5 to 7 years continuously.
Your question is slightly confusing. Do you mean that the computer is not powered by a UPS? If the computer is not connected to the UPS, then why have a UPS? If the computer is not connected to the UPS and restarts when you turn the UPS On, your circuit feeding the UPS is overloaded and the voltage dips. If the computer is connected to the UPS, and restarts when there is a power outage, the fault may lie in the reaction of the HP 800. This unit looks to be a line interactive unit and it is not a true on-line UPS. The line interactive and battery backup (no voltage regulation) units both should have a switch to battery power time of 4 msecs, or less. If this unit is faulty and the switchover time is longer, it will not continue to hold up the computer internal power supply. If you are trying to run a laser printer on the HP unit, it won't have enough output capacity.
The Back-UPS Office unit has five different tones or alarms:
1. Four beeps every 30 seconds (On Battery LED will be illuminated) This alarm indicates that the Battery Power Supplied outlets are now supplying battery power as opposed to power from the utility. If the UPS determines that the input utility power is unsafe for your computer equipment, the UPS will switch to battery power. Note: If the power disturbance is brief, you may only hear one or two beeps.
2. Continuous Beeping (On Battery LED will be illuminated) This alarm indicates that a Low Battery condition has been reached and that the UPS will soon shutdown. Once the UPS transfers to On Battery operation, it can only stay on battery for a limited amount of time. The UPS will sound this alarm about two minutes before the batteries are totally exhausted. Once exhausted, the UPS will shutdown and turn off its output power to your equipment. If you hear this tone you should immediately shutdown your computer to prevent data loss or corruption.
3. Continuous Beeps for 30 seconds (Back UPS OFFICE 250 and 280 ONLY) This alarm indicates the unit has detected an Overload condition after it has performed a self-test during start-up.
4. Continuous Two-Tone Beep This alarm indicates a severe Overload was detected while the unit was on-battery operation. This tone will continue to sound until the unit shuts down.
5. Continuous Tone (On Battery LED will be flashing) This alarm indicates that the battery-powered outlets are overloaded.
6. Continuous Tone (On Line and On Battery LEDs flashing) Back UPS OFFICE 350, 400, and 500 ONLY This alarm indicates that an internal UPS fault has occurred.
A surge protector stops power surges from eskom etc. from fryin your mother board and power supply. when the power goes off sometimes its just a phase . when all phases are off and the power comes back to all Phases instantly at a strong output this can fry your mother board or damage your power supply . surge protector keeps the power at one level even if it isnt , make sense? Also see UPS.Lightning can do the same effect too