False overload alarm or defective unit ? (Back-UPS ES 700)

[Anonymous user]

Hi,

I have two identical Back-UPS ES 700 that manifest the same problem (mention: I changed the batteries thinking they were the problem):

I plug in the ups

I start the ups (with no load)

I let the battery charge 24h with no load

powerchute tells me the battery is full and approximates it to 42 minutes of availability in case of power failure

I plug in any low power device in the ups' battery backup (ex. any one of the following: cell phone charger, external 3.5"HDD, led monitor)

I unplug the ups from mains

the ups starts making a continuous sound as if it were overloading, the device powered by the ups loses power, the status led loses its intensity as if it were barely lit, powerchute loses conectivity with the ups and after a shot time (maybe 30 seconds) the ups turns off.

I unplug the consumer from the ups

I plug the ups back into the mains

all comes back to normal

powerchute tells me the battery is at 96%

.....

I tried changing the sensitivity and voltage settings to low and 167-278 volts and disabled the battery backup alarms at all times but it didn't help

Not to be misunderstood, I tried to power my workstation too (350W) with the same results.

now i'm asking: false overload alarm or defective ups ?

PS: suggestions anyone?

[BillP]

Have you tried this test without the USB cable for PowerChute connected?

Also, can you turn it off and then "cold start" it? Meaning start it off of its own battery power? To do this, turn it off, unplug it from the wall, then hold down the power button to start the unit off of battery. Then try plugging something to see what it does.

[Anonymous user]

Hi,

I have two identical Back-UPS ES 700 that manifest the same problem (mention: I changed the batteries thinking they were the problem):

I plug in the ups

I start the ups (with no load)

I let the battery charge 24h with no load

powerchute tells me the battery is full and approximates it to 42 minutes of availability in case of power failure

I plug in any low power device in the ups' battery backup (ex. any one of the following: cell phone charger, external 3.5"HDD, led monitor)

I unplug the ups from mains

the ups starts making a continuous sound as if it were overloading, the device powered by the ups loses power, the status led loses its intensity as if it were barely lit, powerchute loses conectivity with the ups and after a shot time (maybe 30 seconds) the ups turns off.

I unplug the consumer from the ups

I plug the ups back into the mains

all comes back to normal

powerchute tells me the battery is at 96%

.....

I tried changing the sensitivity and voltage settings to low and 167-278 volts and disabled the battery backup alarms at all times but it didn't help

Not to be misunderstood, I tried to power my workstation too (350W) with the same results.

now i'm asking: false overload alarm or defective ups ?

PS: suggestions anyone?

[BillP · Accepted solution]

Do you see anything on the PowerChute status section in the brief 30 seconds or does the computer start to shutdown?

Definitely does not sound normal and then even worse, there are two units doing this.

What happens if you do this with no load and unplug the UPS from mains, same behavior?

[maxpower]

I currently (Jul-2022) face the exact same issue.

A Back-UPS ES 700 makes an anoying loud continous sound when pulling the mains plug with a testing device (e.g. lamp) connected to the UPS. When unplugging the lamp, the sound stops.

The ES 700 does not tell to replace the battery, though I think I should, it already 6 years old...

Why was your question marked "solved"? I see no solution there.