# Measurement of peaks in the supplied voltage

**URL:** <https://community.br-automation.com/t/measurement-of-peaks-in-the-supplied-voltage/6120>\
**Category:** Controls & Vision\
**Tags:** x20, acopos-inverter\
**Created:** [March 5, 2025, 10:06am UTC](https://community.br-automation.com/t/measurement-of-peaks-in-the-supplied-voltage/6120 "2025-03-05T10:06:13Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Michal\_Malek](https://avatars.discourse-cdn.com/v4/letter/m/FF8800/32.png) [@Michal\_Malek](https://community.br-automation.com/u/Michal_Malek)\
**Post date:** [March 5, 2025, 10:06am UTC](https://community.br-automation.com/t/measurement-of-peaks-in-the-supplied-voltage/6120/1 "2025-03-05T10:06:14Z")

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Hello,  
occasionally, the OBF error occurs on the P86 inverter in a hoisting application, consistently during continuous no-load motion, both upward and downward. The P86 is equipped with a braking resistor that functions perfectly from no-load to maximum load (5t). Throughout operation, the DC bus remains stable at 775VDC. Since I am 100% certain that the overvoltage does not originate from the drive, the only possible source of the OBF error must be the mains supply.

Therefore, I decided to monitor the mains supply and plan to use the X20AP31xx module for this purpose.

My question is simple:  
Is the X20AP31xx module capable of measuring or detecting overvoltage, fluctuations, or peaks in the supplied voltage?  
Level for OBF is 870VDC.

Thank you  
Best regards  
Michal Malek

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**Author:** ![kovarj](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/kovarj/32/537_2.png) [@kovarj](https://community.br-automation.com/u/kovarj)\
**Post date:** [March 9, 2025, 6:04pm UTC](https://community.br-automation.com/t/measurement-of-peaks-in-the-supplied-voltage/6120/2 "2025-03-09T18:04:43Z")

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Can anyone from BRCommunity help @Michal_Malek? 👩‍🎓

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**Author:** ![Michal\_Malek](https://avatars.discourse-cdn.com/v4/letter/m/FF8800/32.png) [@Michal\_Malek](https://community.br-automation.com/u/Michal_Malek)\
**Post date:** [March 10, 2025, 5:44am UTC](https://community.br-automation.com/t/measurement-of-peaks-in-the-supplied-voltage/6120/3 "2025-03-10T05:44:11Z")

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> [@Michal\_Malek](#):
>
> X20AP31xx

Hello,  
Maybe my question is unnecessarily complicated. I’d like to know whether the module X20AP31xx is capable of measuring voltage spikes in the mains network that could cause the inverter DC bus overvoltage to exceed 870VDC.  
Thanks  
Michal Malek

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**Author:** ![arne.heyer](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/arne.heyer/32/4725_2.png) [@arne.heyer](https://community.br-automation.com/u/arne.heyer)\
**Post date:** [April 29, 2025, 6:42am UTC](https://community.br-automation.com/t/measurement-of-peaks-in-the-supplied-voltage/6120/4 "2025-04-29T06:42:30Z")

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Did you activate the function beyond TOST?

 ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/f/fad724ff88f2aeacff3aa7eb35806864ecd178e5.png)

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**Author:** ![Michal\_Malek](https://avatars.discourse-cdn.com/v4/letter/m/FF8800/32.png) [@Michal\_Malek](https://community.br-automation.com/u/Michal_Malek)\
**Post date:** [April 29, 2025, 7:17am UTC](https://community.br-automation.com/t/measurement-of-peaks-in-the-supplied-voltage/6120/5 "2025-04-29T07:17:01Z")

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No, toSt is not used and remains at factory settings.  
Thanks  
Michal Malek