Question about APC Back-UPS 400EI (BK400EI) UPS System

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    etarcturus20 Dec 02, 2012




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How to cennect the input line, L1 and L2

If you open the back of the UPS and unscrew the 3 large screws you should see where the input and the output hook up. I have a user manual if you need one. Just email me at and ask for the manual. If you have one then can you be a little bit clearer on what is needed.

Sep 20, 2011 | Emerson Fans Liebert GXT2 6000RT UPS AC...

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825AVR (cps825avr-sc) UPS System: I need the manual for the cybr power 825AVR...

It's now (2011-03) listed as a discontinued model but the user manual is still online at

May 16, 2010 | CyberPower 825AVR (cps825avr-sc) UPS...

1 Answer

APC UPS 500 and 600, both say (PowerChute) commercial power is off and running on battery when the commercial power is fine. They end up shutting down my systems. After a while they run normal.

This is usually caused by a popped circuit breaker on the UPS. From the UPS Manual:

Disconnect non-essential equipment from the
Back-UPS. Reset the circuit breaker (located
on the rear panel of the Back-UPS) by pushing
the circuit breaker button fully inward
until it catches.

You can find the user manual here:

Mar 24, 2010 | APC Back-UPSĀ® CS 500 UPS System

1 Answer

Where can I get a user manual? I don't know what to plug into where.

Reply back with the model number.

Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
Thank you.

Mar 13, 2010 | APC Back-UPS Pro UPS System

1 Answer

Need instructions to install a new battery

1. If you have a dell computer, visit 2. Enter services tag and click on manual.
or if you have any other computer, please visit the manufacture's website, and in the search box, type in, Manual.

Feb 10, 2010 | APC Back-UPS Office 500VA (BF500) UPS...

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Inverter 12V to 230v not working

Could be the devices, the inverter, the up converter,or the micro.

Throw it away and buy a new one, as this will be cheaper and easier.

UPS devices are very complicated with lots of related circuits logic etc.

These units are not made to last, recover the batteries or recyle the whole thing.

Sep 13, 2009 | APC Back-UPS 400EI (BK400EI) UPS System

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