Question about Computers & Internet

2 Answers

UPS problem When my UPS is on without load, it shows the " main power on " which is normal. but once i connect it to a load and switch on, it transfers from main supply to battery supply even if the main power is on. Can you suggest me how to go about this problem?

Posted by on

Ad

2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

It sounds like you have a problem with your load, are you getting any alarms and what kind of UPS do you have do you have and what is your load , moters .pumps, computer get a service manual. on your UPS if you can or contact tech support

Posted on Oct 04, 2009

Ad
  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 6,966 Answers

Hi,

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.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Apr 16, 2008

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

GE LP33 UPS inverter failed to start


Dear Yared,

Did you try to give the UPS some time to recharge the batteries?
Seems like the batteries have reached their cut-off voltage and are not supplying enough voltage to the inverter.

Normally the dc boos circuit of the UPS will supply voltage to the DC BUS so maybe the problem can be found in the dc boost circuit or BUS if recharging the batteries is not helping.

Let me know.

Best Regards,


Ron

Jan 22, 2013 | MGE Computers & Internet

1 Answer

SUA3000RMI2U won't carry load


Did you run this test without AC input?
Also what happens when you cut off the AC mains without any load connected to it? Will the UPS continue to run or does it switch off as well?

Dec 15, 2012 | APC Smart-UPS 3000VA USB & Serial...

1 Answer

In my home using 100AH battery for inverter , want to know wht happens if the baterry is not connected to inverter ? Is battery life decreases..? or WHAT ELSE WILL HAPPENS TO BATTERY ..? plz give an...


It depends upon the type of UPS.

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.

Dec 21, 2011 | Televison & Video

3 Answers

Can i have all the basic details of UPS system


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

Dec 16, 2010 | Emerson PowerSure Personal 500VA...

3 Answers

Our apc ups showing overlaod when power is switched on


I am assuming that nothing is plugged in when powering up. This usually means that there is a short or damage to the unit. This forum discusses the issue: http://www.apc-forums.com/thread.jspa?messageID=15110

Dec 31, 2009 | APC Back-UPS RS 800VA UPS System

1 Answer

Sir after changing the battery ups worked well one day and the next day onwards when i pressed the switch red and amber lights blinking and the upc trips with beep sound .kindly give the solution


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. There maybe one battery in a set of batteries that is faulty and causes the whole battery system to fail and indicate a battery fault.

These lower powered and cheaper KVA type UPS are switch over types, when the mains supply fail, the UPS switches over to the inverter in milli-seconds which then supplies mains power but the power waveform is a pseudo sine wave (ie not a true sinewave. A faulty inverter circuit won’t deliver power when the mains supply fails.

The true UPS types are usually the higher KVA units (over 1500 VA) that supplies uninterrupted 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 therefore there is no switch over time lag from the mains to the battery.

Oct 16, 2009 | APC Computers & Internet

1 Answer

Dead appearing ups/inverter


keep on your main switch. off all the lights fan and other electrical items, let that inverter get charge first

Jun 18, 2009 | APC Back-UPS CS 500VA UPS System

2 Answers

LCD shows Low O/P V


Fault: Low Ouput Voltage

Cause: Surge Taken by load / Short Circuit on load / Fault in inverter

Remedy: Remove load and restart UPS / Try a different load / Repair or swap out

If you need spares or price for repair contact Eaton Power Quality Ltd - the new name for Powerware - 01753 608700

Dec 15, 2008 | Powerware 9120 UPS System

1 Answer

Dynex TE685AVR - wiring problem light on


yes first disconnect the pin of load then switch off ups then switch on check ac voltage at output if comes and disappears when load is connected then battery is faulty it shows voltage without load but disappers when load is connected replace battery

Nov 09, 2008 | Dynex (TE685AVR) UPS System

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

677 people viewed this question

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...