At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
I have a liebert NXe 20 kva ups installed at our plant and we are facing some problems with it.It is showing charger fault when charging circuit is on and also it is switching automatically from main power to bypass power.does this switching happens because of overtemparature.what should i do??
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
1.check the battery voltage if it rise up,if risen its shows the batteries are charging.2.after powering mains,wait for the ups to transfer to ups on mode,then disengage the batterry breaker,ups should still continue to powerup if charger is ok but if ups shutdown during the transition,then the charger is not on.or call me 08082245266.
UNINTERRUPTABLE POWER SUPPLY 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 environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. If one battery is faulty in a set of batteries it will causes the whole battery system to fail and indicate a battery fault. A faulty charging circuit will not charge the batteries and will also cause a fault condition. Lower powered and cheaper type UPS are switch over types, when the mains supply fails, the UPS switches over to the battery 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 power 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 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.
Depends on the size of the computer power supply, and CPU, Memory, Video Card, and so on. I'm guessing 1,000VA would be around 650-700watts, well unless someone revoked Ohms law anyway.
If you simply want to shut down, and save data, perhaps two might remain powered up for ten minutes, One 20 minutes. Also what else is being supplied via the UPS? You will need to keep your monitor(s) on, Suffice to say "Not very long".
Hi, Thanks for contacting fixya. There could be many reasons.
1. The battery is old and completed its charge-discharge cycle.
2. The step down transformer (220/110V to 12/24V) coils got shorted inside.
3. For a trickle charger, the SCR might have gone bad.
Solution for 1. Take out the battery and charge it by another charger. You can use laptop charger, cell phone charger or any charger. You might have to do a little bit circuitry. Then after 2-3 hrs of charging see if the battery voltage goes to its peak. Use a voltmeter or multimeter to measure that. If the voltage does not goes to its peak then battery is faulty. And the charger circuit has no problem.
Solution for 2. Some times step down transformer goes wrong. Measure the output voltage by a multimeter and see if it is giving the voltage what it should be. If not then change the transformer.
Solution for 3. I don't know how to determine if an SCR is wrong. The easiest way to check is to replace it and see if the battery is changing.
It really depends on how large your computers are and what they actually require. A 750 W Cisco Server will require usually a 1.5Kva UPS and give you around 7-9 minutes depending on the model of UPS.
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 environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. If one battery is faulty in a set of batteries it will causes the whole battery system to fail and indicate a battery fault. A faulty charging circuit will not charge the batteries and will also cause a fault condition.
Try to find your manual here in this site. Choose your Product Category, Product Application, Application Type and Specific Product. After that you can download the manual. Hope this helps. "http://www.liebert.com/servicesupport_pages/ProductDocumentSelector.asp"
×