APC BE850G2-GR first power on out of box

[LeoBorealis]

Hi everyone!
Can you tell how first power on of BE850G2-GR should be?
My experience:
1) Unboxed (all looked alike it is brand new device, because package was sealed and UPS was sealed in clear PE packet too)
2) Connected a battery and plugged in to wall outlet

3) But... UPS power on immediately (green LED on power button lit immediately and battery charging led start blinking)

Why I am asking: recently bought an BE650G2-GR and there was a need to press button to power-on after connecting to wall outlet.
Does my BE850G2 used, refurbished and so on?

[Teken]

I’m not sure I understand your question. Are you asking why the unit turned on immediately instead of needing to press the power button?!?

Or, asking if the hardware is used, refurbished??? 

If the question is the (First) why did the unit turn on without needing to push the power button. It’s a combination of bad design and inrush current / voltage jump starting the unit.

In the industry as it relates to (Safety) there are standards, regulations, and laws that state certain devices must:

Make before break, Break before make. The other is fail safe vs fail secure. The first generally speaking means when something is powered on or connected to power the ground pin is first to (Make) contact before the two hot / neutral pins are connected to the outlet. As the ground pin is longer than the other two.

Conversely, when you (Break) remove the plug from the wall outlet you’ll see the hot / neutral break away first - than the ground pin as it’s longer.

This very simply design illustrates the make before break & break before make safety principles. 

The energized contacts break in this simple example which there are many illustrate the safety ground is ALWAYS made first, and last to be removed.

In a piece of hardware like a automatic transfer switch (ATS) this principle is a little different but the concept is similar but it’s intent is different. As the goal is to reduce arcing, drop in power, and quick transfer time.

You essentially have relay contacts that switch on / off in parallel. As noted up above this ensures the (ATS) or any type of transfer switch meets the three goals up above.

In the UPS proper design would dictate no matter what happens the unit will never turn on unless the power button is physically engaged / pressed! ☝️

Keep in mind all the above pertains to a out of the box scenario and not where the hardware has been programmed to resume / restart upon power restoration.

Lastly, you can quickly test this out yourself. Press the power button to turn the unit off. Remove AC Mains from the wall outlet. Disconnect the battery and press the power button until you hear a beep / click. You may also not hear anything. ☝️

Wait 30 seconds and only plug in the AC Mains. What happens does it stay off or do you see and hear something from the unit??

If nothing happens - good. If something happens you know the design.

Remove AC Mains and reconnect the battery - what happens? Nothing - Good! If something happens when only the battery is connected without AC Mains you know the design.

Lastly, while the AC Mains & battery is disconnected press and hold the power button for at least 15 seconds or until you hear a click / beep.

Connect the battery, apply AC Mains to the system. What happens?

What you’re going to see is random results where the unit doesn’t always turn on without pushing the power button. In a good design no matter how many times or ways you try to power up the unit it will never power on unless you press the power button! ☝️

Report back what you see and observe. 👍