Mge ups 500va

[stepgr]

Hi folks,

I have a problem with this little ups I use on my desktop pc at the office.
It happened overnight , one evening I went and next day nothing comes up
from this unit. I press the power button it beeps some relay clicks and shuts off immediately. My (wrong) first guess was that the battery went dead (it was more than two years that I've changed it, but the same thing happens with a brand new battery. No output voltage just a beep and a relay click. The battery seems to be charging though , cause if you plug it in the mains without a battery no voltage come on the battery connectors but if you connect the battery, the unit makes a beep all leds flash and then voltage comes on the battery terminals.

I'ts just my lucky device and looking for a way not to throw it away if possible.

[budm]

Re: Mge ups 500va

"The battery seems to be charging though , cause if you plug it in the mains without a battery no voltage come on the battery connectors" There should be DCV at the terminals (without battery in place) that go to the batteries the minute you plug the UPS power cord into the AC outlets, the charging is always active.
Is this the unit you have?

See page 4 of the attached PDF of the user manual.

[stepgr]

Re: Mge ups 500va

No it's an ellipse ups 500 this is the user manual

[budm]

Re: Mge ups 500va

Page 3:
Notes:
1. You do not have to switch on the UPS for the batteries to remain charged.

So any LED status blinking codes as shown?

[stepgr]

Re: Mge ups 500va

let me repeat my actions in the right order :

Dead unit,
replace battery ,
plug in mains cord and press the power button,
Unit beeps shortly all the leds are flashing once and one of the relays clicks also.
It immediately shuts , if you press the on switch again the all leds flash unit beeps the relay clicks. From there on nothing else happens until you remove
the mains cord or the battery.

Then I open the unit remove battery , plug in to mains power.
No voltage on battery terminals , if I plug the battery back , the previous
sequence of events happens again but this time charging voltage appears
on battery terminals, ( I can tell because after that I remove the battery again and measure 13,8V at the battery terminals).

It all seems at the unit sees some problem in the output and shuts down immediately. Removing the battery resets the circuit (that's why I suppose the leds flashes and the unit beeps when I press the power button).

There is no power in the output at any time.

Hope this is more clear now.

[budm]

Re: Mge ups 500va

OK, do this for me.
1) Unplug the power cord from the outlet.
2) Unplug the battery from the unit.
3) Put the DCV meter's Red probe on the terminal of the red wire that WAS attached to the battery.
4) Put the DCV meter's Black probe on the Black terminal of the Black wire that WAS attached to the battery.

5) Plug the UPS into the AC outlet but DO NOT TURN ON the power switch, notice if you do hear the relay clicks or not.
6) Look at the DCV meter to see what is shown on the meter.
7) Turn on the power switch and take notes if the relay clicks or not. Look at the DCV meter to see what is shown on the meter.

The UPS has only one ALWAYS ON (meaning it is running the minute you plug the power cord into the AC outlet WITHOUT turning on the power switch on the front panel) SMPS power supply that is used for charging the battery and for running the logic and related circuits.

"Then I open the unit remove battery , plug in to mains power.
No voltage on battery terminals , if I plug the battery back , the previous
sequence of events happens again but this time charging voltage appears
on battery terminals, ( I can tell because after that I remove the battery again and measure 13,8V at the battery terminals)."
The reason you see the 13.8V on the terminal AFTER you connect and disconnect the battery because those two large filter caps are conected to the battery terminals and they are charged when you connect the battery to the terminals and they stay charge after the battery is removed. The charging Voltage should be present without the battery in place.

[stepgr]

Re: Mge ups 500va

Good day

I did as you asked and :
Step 5 and 6 nothing is shown on the meter , no clicks from the ups relays nothing

Step 7 Nothing happens here either. The unit is dead without a battery . The power switch is just a push button and with out power from the battery ( as I understand now, after you pointed it out ) nothing happens when you press it.

The previous behaviour was due to fact that the PCB got power from the battery, it senses something is wrong and shuts down .