AVR not working on low AC voltage

[Anonymous user]

Hello, I bought last week a BR900G and I think the AVR is not working correctly. Even if the incoming voltage drops down to 202V the AVR is not activated. The only way to make the AVR work is to unplug the unit for a few seconds (battery mode). After plugging in again, the UPS switches back to AC mode and now AVR is activated until input voltage rises up to about 218V, which is ok. In the technical specification says that the AVR will be active for low incoming voltage between 188 and 216V and this is definitively not happening.

[prince213_apc]

By the way AVR is not needed for computer related loads like SMPS, monitor, various adaptors. If you not believe then look at their specifications, it can work in a very wide voltage range ex: 100v to 240V with limits much higher like 90 - 264V. Thus AVR is just a fancy thing which is kept adding due to an old trend in line interactive UPS's. AVR does find useful in motor related equipments like fridge, washing machine, fans, induction heater etc as running motor winding in low voltages can draw large current resulting in increase in coil temperature which in turn can burn it. But these UPS are not intended for powering such loads.

[Anonymous user]

Thank's  Prince, but I have just one PC connected with an average power consumption of about 80W. The problem is that my PC after a while working on low voltage (below 210V) shuts down and restarts and restarts and restarts .......

[prince213_apc · Accepted solution]

Hi Andreas, I think the UPS not only not doing AVR but also for a brief period not giving any output to computer that's why restarting. You can check this by connecting the computer directly to line voltage and see if its restarting when on low voltage.