My UPS autometically converts itself to UPS function even when the main supply is on. IF the UPS is moved a little bit it is OK. After some time it again gives the problem. Its variables have been cleaned with thinner.Can you guide me about the fault and the remedy.
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Re: trouble shooting UPS
Sounds like you have a cold solder joint somewhere on the PC board.
I would pull the PC board off......before you do that. May I suggest you take a digital picture of it before you take it off so you know where all the wires go. Flip it over and touch a hot solder iron over verious areas you might suspect that you have exposed or cracked joints.
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A true UPS requires a battery to be connected to the inverter at all times. Mains power is used to charge the battery constantly and battery is required to continually supply power to the inverter which then converts the voltage to mains supply voltage.
A lower powered and cheaper type UPS areswitch-over types, when the mains supply fails, the UPS switches over to thebatteries and the inverter in milli-seconds which then supplies mains power to thecomputer and peripherals. This type UPS may operate without a battery, but it depends upon the design of the UPS and the battery error detection system In most cases I doubt it can operate without a battery. You can try the UPS without a battery, make sure the battery terminals do not short against each other.
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.
UPS – UNINTERRUPTIBLE POWER SUPPLY Uninterruptible power supplies provide protection against mains power faults to computer equipment. These faults include voltage spikes/interference, over voltage and under voltage, mains supply interruptions and surge protection etc. These faults can cause computer and electronic equipment that are connected to an unprotected mains supply to malfunction and/or sometimes fail. A common problem, when burning Cds, DVDs etc. any slight power interruptions to the burning process will halt the recording process and rendered the disc useless. There two type of Uninterruptible Power Supplies The lower powered and cheaper type UPS are switch-over types, when the mains supply fails, the UPS switches over to the batteries and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails. NOTE : The mains waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave). The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and then the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.
A bit of a whacky suggestion, but you could get yourself a UPS (Uninterruptable Power Supply).
PC Stores sell them for home PC's, but you would need to check the output capacity of the UPS could handle the fridge. From what you say, you only need to protect from a "Blip" and if the power was to go out for a few minutes and then reset, the freezer would be ok and would reset itself without a problem. IF this is the case then a small UPS might be your answer because it would only have to provide support to the machine for a few moments - If it then failed it would be because the power was actually out for a little while and when it came back up the freezer would do what it should and recover.
UPS come in two types, lower powered cheaper types are usually switch over power. These units senses a power outage and then switch over to the battery power to generate mains supply. The switch over occurs in milli-secs and does not affect the computer. True UPS types constantly run off battery power to generate mains supply so there is no switch over time lag. These units are higher powered and higher costs units.
Both type of UPS have the same components. Battery charger. Batteries Inverter that converts battery voltage to mains voltage Electronic controls
Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. including the number of times the unit must go on battery power and enviromental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only a float voltage and a true indication of the battery voltage needs the batteries to be tested under a load. there maybe one battery that is faulty and causing the whole battery system to fail.
These lower powered and cheaper KVA type UPS are switch over types (when the mains fail, the UPS switches over to the inverter in milli-seconds to supply mains power). It is a possibility the inverter circuit is faulty and when the mains power fails the inverter does not switch over.
The true UPS type are usually the higher KVA units (over 1500 KVA units) that converts mains power continuously via the inverter circuit. The mains power charges the batteries and the inverter drawing power from continuously from the batteries (therefore there is no switch over time lag from the mains to the battery.
Based on your post/description, two (2) possibilities: 1. electronic fault - main power/AC mains sensor which could be really just a relay; or 2. corroded fuse terminals or fuse holder.
The first is a bit of a challenge since different brands/models have different sensing circuitry design. Some can be as earlier stated, a simple AC relay while others could be a TRIAC switch with a DIAC trigger. Still, some could be an elaborate AD converter and a myriad of logic circuitry. Often, a service manual or at least a schematic diagram would be needed, however these are not that readily available and most often the tech or DIYer must resort to winging it. This of course would require familiarity with electronic circuitry and components, use of a DVM and a soldering iron. Extreme caution must be exercised since even with 12VDC supply most of the electronics are at least at 60VAC+ level.
The 2nd possibility would be of course be the easiest to determine and repair. Replace/clean.
Should the downtime & repair cost makes the project no longer economically reasonable, perhaps your best bet would be to simply replace the UPS since their prices are relatively low.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.