UPS: Bypass not in range ; either frequency or voltage. happening more frequently?

[Anonymous user]

so im in to my first month at my new job and they gave me this to find out about.

they have told me that when ever they get this error that it it wont last longer then then like 15 mins or so but now its blowing up our email accounts.XQJjq8iJz5B%2BST3JC6YWpQ%3D%3D&Rest-Api-Key=d3Bhc3F1aWw6NjM3MzU2MWEtNzYzMC00OTc5LTkyMTAtOTJjYTU0NGEwZWFl.png

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looks like the servers need 208 so cant move that up. eager to understand this better help fix the problem thanks!!!

Jason 

[BillP]

Hi Jason,

In looking at your logs, I think this FAQ applies: http://www.apc.com/us/en/faqs/FA299053

Your input voltage is 240V but you are outputting 208V as shown in your screenshot. I understand what you said about the servers but keep in mind, if you're UPS goes to bypass, they will be fed 240V anyway.. this is not good practice in general and I believe is likely contributing to the alarms. I'll try to explain.

It seems like your max input voltage (Vmax) in the data log gets pretty close to the upper bypass voltage limit of 250V/ Frequency looks OK so I am betting it is the voltage triggering the alarm. It is trying to tell you, if the UPS has to go to bypass for one reason or another (fault, overload, etc), the voltage (or frequency) is out of the range. And depending on a few other settings and UPS model, it will turn off or feed this voltage/freq to your equipment.

To loop back, I think the main problem here is that your input and output voltage settings don't match. If your output was set to 240V and matched your input voltage, the bypass upper voltage would allow for a higher range and if the input voltage is going over 250V, it'd be within the limit based on 240V nominal (normal) voltage since the range could be changed to 270V.

I am reviewing the user's guide here for SRT3000 which according to your log is what you have. http://www.apc.com/salestools/JGNY-9LPDQJ/JGNY-9LPDQJ_R2_EN.pdf and refer to pg 15.

Note how the bypass voltage ranges change based on your output voltage setting. To address this, ideally you'd want to change your output voltage to match the input. I think modern servers and equipment can handle multiple voltages (120/208/240V) so if you want to pursue this, then you can investigate the acceptable input voltage ranges for the attached equipment connected to the UPS. This is usually indicated in the specs or on the power supply itself physically on the server. If you do find out the attached load can function at 240V, then you can probably change the output voltage setting. (You can only change the output voltage setting when the UPS is off.)

Alternatively, if the equipment is strictly 208V only for some reason, then you can also evaluate changing the voltage at the outlet/power feed to the UPS but I imagine that is not easy and will cost $$. 

Hope this helps.

[Anonymous user · Accepted solution]

WOW thank you so much i can rap my head around it so much better now! i will start researching the acceptable power for the equipment attached and see what i can do next thanks again 

[BillP]

You're welcome!