Alert UPS: Bypass not in range ; either frequency or voltage.

[BillP]

Hi, 

We are noticing a number of events on our UPS so often. We have 3 Smart SRT 6000 in our server room and all three were generating alerts every couple of months. 

02/24/2018	07:35:54	UPS: No longer on battery power.
02/24/2018	07:35:53	UPS: An input voltage or frequency problem no longer prevents switching to bypass mode.
02/24/2018	07:35:53	UPS: On battery power in response to rapid change of input.
02/24/2018	07:35:53	UPS: Bypass not in range ; either frequency or voltage.
02/24/2018	06:46:35	UPS: No longer on battery power.

We have complained to building management and they confirmed that there are no issues with their equipment or they have noticed any input fluctuation during that peirod. Also, other tenants have no complaints about any such fluctuation same time. 

I did log a support ticket with APC but have not got any satisfactory answer on it. 

Did anyone have any clue what's going on?

Thanks,

Vaibhav 

[BillP · Accepted solution]

Hi Vaibhav - 

This is a safety measure which keeps the UPS from switching to bybass if the input power is outside of a set parameter. If you could provide the data log from the time frame that you see the errors, we can probably give you a better answer of what exactly why this is happening. If you want to change your bypass limites you can do that via the web interface of the UPS. Go to "Configuration" then "Power Settings". You will see options for Bypass upper and lower voltages. You can set them to whatever you are comfortable with for the equipment you have attached.

One other note - These messages are much more common if you have the output voltage set to a different voltage than your nominal input voltage. For example - An SRT6KRMXLT is a nominal 208v unit. If you are feeding it 240v it will still output 208v unless you manually set it to output 240v via the Configuration/Power settings menu. For best performance your output should match the input voltage.  One note - If you need to change the output voltage of the UPS the output must be turned OFF when you make the change. The UPS will not allow you to change output voltages live.

Thanks!

Liam