Dear Sir

I have purchased a UPS Switching Power Supply 13.5V 10 Power Transformers AC 110V 220V Model 4310 a few years ago and it is working fine.  Does what it should.

I would like to know how I can use an LED to show when the UPS is operating.  I.e Power is being drawn from the Battery.

I note that there is a a small four point white connector on the outside of the board and wondered if this has the ability to do what I want or anything else.

I don’t expect you to send me a complete schematic but it would be useful.

I want to mount this unit in a metal box and I think some status lights like:

• AC power available (which is easy to do)
• DC power available ( which is also easy to do)
• Battery in use.  ( could do this with a simply relay operated by mains power and the Output DC through the relay contacts used to illuminate the LED/lamp but I was hoping for something more solid state.

Also what is the C contact for.

Thank You