BR1000MS Strange Behavior (Doubt)

[Anonymous user]

Hello. i purchased a Back-UPS BR1000MS a week ago, and where I live there're seldom many overvoltage events. I'd like to know If what is seen in the video is part of the normal performance of the Back-UPS and If I have to worry about it. 

[BillP]

Hi Emiro,

This unit is switching back in forth on battery and for a split second you can see that the unit when on line power states it has the AVR working. It is possible that the voltage is lower than expected which could cause this as well as an overvoltage. The other reasons could be that this unit is experiencing dirty power, such as from a generator, and causing it to do this flipping.

This issue may be resolved by changing the sensitivity settings on your unit.

To do so follow this link and on page 4 it gives you the instructions.

http://www.apc.com/salestools/AHUG-AJTDE9/AHUG-AJTDE9_R0_EN.pdf

[Anonymous user]

Hello, thanks a lot for your replay. Do you recommend changing the UPS sensitivity from Medium (Current one) to low? I've read the instructions and it says it is not recommended for PC loads, which turns out to be the the equipment plugged to Smart UPS.

[BillP · Accepted solution]

Hi,

Changing the sensitivity to low should provide adequate protection. Lowering the sensitivity may allow your UPS to operate online during a wider array of input conditions, however it also increases the transfer time of the UPS. "Transfer Time" is the length of time a Line-Interactive UPS takes to switch from online to on-battery operation. The level of power disturbance can affect transfer time when the unit is set to Low. Some sensitive loads may not be compatible with the extended transfer times experienced at lower sensitivity settings. Extremely sensitive loads may perform better with an online UPS such as a Smart-UPS RT which has no transfer time.