I was given an American Power Conversion 450 AT+ UPS. No manual and couldn't find one on the APC site. Said to be faulty.
It works but doesn't seem to work when power cuts off.
Unit has two switches on the front. The first is an ALARM rocker switch which when toggled off tests the alarm system. Shrieking sound. Toggling on disables the alarm. This switch only functions when the SECOND switch is OFF.
The second switch is labelled OUTPUT POWER and when in the OFF posiition glows red. In this position anything plugged into the UPS gets power. When it is in the ON position no power goes to any connected device and the red light on it is off.
Now is this the normal mode of operations as I have described for this unit?
Should battery power be getting to this unit when the OUTPUT POWER switch is in the on condition?
If i dsconnect the power to the UPS unit at the wall, any device plugged into the UPS dies an instant death. Shouldn't the UPS be supplying power to this device? The alarm system cuts in though and sounds a high pitched shriek.
I suspect that the battery system for this unit is not charged fully. How can I recharge it fully because I suspect it may be a NIcad pack of some sort not charging fully. Some sort of memory effect.