Intellipower 1.6KVA UPS Issues

Nightshade,

If you have put a transformer in to raise the voltage, you have cut the available current.

The Voltage and Current are reciprocal to each other when you introduce a transformer.

1.6kVA/110V = 14.5A therefore @ 240V: 1.6kVA/240V = 6.7A

Not really enough to drive much, especially considering losses just to run the transformer itself.

Better to get the right sized UPS at the right voltage output.

Regards,
Sapper

I dont think the currents are less to drive anything. It depends on the Wattage of the connected load.

As an added development i tried plugging in a lamp right at the output of the transformer and it woked perfectly. This means that the UPS wiring has been messed up.

Regards

Nightshade,

Your understading of how this works is flawed, the Rated Voltage and Current requirements are the key to any electrical device working properly.

Just because a device is rated at 240W does not mean it will work on any power.

The device will be rated to operate at a specified Amps at a specified Voltage.
Changing either value does not mean it will still work just because the Wattage is the same.

Regards,
Sapper

Dear Nightshade,

I understand that the fan and light are working when the UPS giving power by battery (back up mode) but these doesn't works when power available on UPS input terminals.

This case, the possibility is your input power supply to the UPS is not rate voltage, I mean it should less than 240V. Check and clear it.

Byee

Dear Sukumar75

The light worked when the UPS was in bypass mode ( power mains available) and not in the backup mode since the batteries required charging. I will charge the batteries and see the output.

As for the earlier comment i agree both voltage and current ratings need to met. I checked the rated voltage of the lamp which is 220-2440VAC and net power is 22W.

Does your transformer work correctly when it is plugged directly to mains and not using the bypass mode of the UPS at all?

I have not tried testing the transformer directly from the power mains since its a step up auto-transformer ( 110-220 V). I was not sure it could sustain the increased voltage level of 440V if plugged directly from power mains.

Your utility power is 220V and your UPS is 110V?

Yes indeed it is so. The input is auto selected by the UPS and can be either 110V or 220V however the output is 110V thus i have connected a transformer to step this voltage up to 220VAC.

So your UPS auto senses the incoming and fixes the output at 110 regardless of incoming.

and when you go to bypass mode the UPS does what? pass the mains straight through (could be a problem) or pegs it at 110 in a not really a true bypass kind of way?

Do you have a multimeter?

The UPS is an inline type so the power is always routed through the batteries. The ouput is always 110V

So there is no bypass?

nightshade,

Given the information Wal has been able to get, you have the wrong UPS for the wrong environment.

If your mains is 240V get a 240V UPS. What you are doing is dangerous.

Unsubscribing now.

Regards,
Sapper

Is it possible for you to show a block diagram of the connections you have made ( showing the mains, the UPS, the transformer and the lamp)? Do you get 220 v at the transformer output when the input supply to the UPS is removed?Do you get a 110v output at the UPS when you remove the transformer and also the input supply to the UPS? Does the output supply fail only when you connect the input supply to the UPS? It might be possible to draw some conclusions if you could answer these.

Thanks guys for you feedback. Firstly there is nothing dangerous about using a UPS transformer combination for back up. Secondly i rectified the problem which was due to neutral fault.

Now comes the interesting part. The UPS previously worked fine in back up mode but now even after charging it for 8 hours the batteries are not charging up. I need help with rectifying this issue first

New batteries right?

How many, what type and did you connect them properly?

The batteries are 12V 8Ah each and yes they are brand new. The problem here is that the front panel is not working as it should. Moreover there is no manual available for the UPS on the internet so i am flying blind here. Now i can connect it to a PC using RS232 and a RUPS software i am gonna try that first