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Faulty UPS APC 650Va

 
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PostPosted: Thu Dec 01, 2005 7:03 pm    Post subject: Faulty UPS APC 650Va Reply with quote

I Have 1 UPS APC 650Va. The UPS was working fine but it has now developed a strange symptom. When you switch it on Green LED does not light up but when you press the Test Button the Green Led appears and the UPS works for few seconds and goes into off mode and the Alarm keep on beeping as if the power is disconnected and the battery is low.

Please let me know whether it is repairable and which components are to be replaced.
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RE_King
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PostPosted: Tue Dec 06, 2005 7:57 pm    Post subject: Faulty UPS APC 650Va Reply with quote

I think the most likely cause of the problem is from a bad battery.
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PostPosted: Sun Jan 01, 2006 3:46 am    Post subject: Re: Faulty UPS APC 650Va Reply with quote

guest wrote:
I Have 1 UPS APC 650Va. The UPS was working fine but it has now developed a strange symptom. When you switch it on Green LED does not light up but when you press the Test Button the Green Led appears and the UPS works for few seconds and goes into off mode and the Alarm keep on beeping as if the power is disconnected and the battery is low.

Please let me know whether it is repairable and which components are to be replaced.


You can try this easy test if you have a voltmeter, and a car
battery charger. Both are common in most men's households.

open the unit and measure the battery. It should be about 12.6 volts.
If it's less than 12.2 volts and the UPS has been on generally and
has had time to charge the battery such as being on for a day within
the past two weeks then the battery should be over 12.4 volts.

If not then the battery could be bad and not taking a charge. OR the
charging circuit in the UPS could be bad.

TEST THE BATTERY
Remove the battery and charge it with the car charger.
Turn on the battery charger and verify that the DVM is measuring
between 13.6 to 12.4 volts DC. If it's a little bit higher or lower
by 0.2 volts that's OK. But no more...

Your charger will have a meter on it to show how much current
is being drawn. The current should be very low. Less than 1 amp if The
battery is charged up. IF not then the current will be about 4 amps.
If it's more , like 10 amps then do not charge the battery for
more than a few minutes at that rate. It's ok for 3 or 4 minutes
but 10 amps is too much for a long time.

If the current is 4 amps or less then let the battery charge but
watch it. If in 30 minutes it has begun to show a lower charge
current then it's taking a charge .. but it still might not be good.

After about 1 - 2 hours the battery should be fully charged. Take off the charger . Check the battery . It should be about 13.5volts. If it's
lower like 12.6 then it's not taking a charge. Replace it.

TEST THE UPS
Get a regular 12 volt car battery charger so you can supply 12 volts
to the battery in the unit. Check the voltage with a voltmeter. (DVM)
If the unit has a high / low / mid switch then set it so that voltage
output is about 13.6 volts. Find a way to leave the voltmeter
connected to the leads of the charger.

Take out the battery
Before you plug in the charger connect it to the red and black
leads for the battery wires. This will supply 12 volts in the same
way that a battery would. Turn on the charger. check the voltage.
IT should be 12.6 to about 13.6 volts.

Try the test now with the UPS. It should work properly.


If the battery took a charge or you just want to try it out put the
fully charged battery back in the UPS. Try the test. If it works
then the charging circuit might not be working properly.
But it's also possible that the battery is not working right and
the charger just can't handle it as well as the car charger.

Anyway if the battery is bad the test might work but the UPS would
probably die within a few minutes if you put a load on it.

To test it with a load put 3 or 4 , 100watt lamps connected to it.
Or something that is about 300 - 400 watts. A kitchen appliance
that is 300 - 400 watts will be ok.. check it first.

Try it and see how long it runs just on battery power. If it runs
for 10-15 minutes (or however long it's supposed to keep it up) then
the battery is probably barely OK but the charging circuit is not
well designed to handle batteries that are marginal.

The only thing to do is replace the battery.

IF you have room and want to put a bigger battery there's no
reason you can't put a bigger battery outside the UPS. Just extend
the wires to a bigger battery and you can run the UPS longer and
maybe the battery will last longer too if you 'go down' often.

I agree with the first poster. It's likely that it's the battery.
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