# Reducing X90 mobile controller inrush current **URL:** \ **Category:** Controls & Vision\ **Tags:** x90\ **Created:** [April 30, 2026, 10:11am UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103 "2026-04-30T10:11:52Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![kazi](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kazi](https://community.br-automation.com/u/kazi)\ **Post date:** [April 30, 2026, 10:11am UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/1 "2026-04-30T10:11:52Z")
I am driving a B&R X90 mobile controller from an Orion XS1400. The inrush current to the X90 (about 11A) is tripping the 12V voltage output of the XS1400. is there a way to reduce the inrush current of the X90? Thanks _Moderator note: combined two posts for readability_ ---
**Author:** ![christoph.altenbuchn](https://avatars.discourse-cdn.com/v4/letter/c/FF8800/32.png) [@christoph.altenbuchn](https://community.br-automation.com/u/christoph.altenbuchn)\ **Post date:** [April 30, 2026, 12:11pm UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/3 "2026-04-30T12:11:28Z")
Hello, I am not sure how the system architecture looks like, can you please clarify? The maximum inrush current is 5A for the CPU & 10A for each IO supply (number depends on which X90 you are using) Therefore, a total inrush current of 11A can be normal depending on your usage of the outputs. As far as I see the Orion XS1400 can supply up to 50A, correct? Please describe the issue in more detail, especially the architecture & the configured IOs. ---
**Author:** ![kazi](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kazi](https://community.br-automation.com/u/kazi)\ **Post date:** [April 30, 2026, 12:34pm UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/4 "2026-04-30T12:34:49Z")
> [@christoph.altenbuchn](#): > > The maximum inrush current is 5A for the CPU & 10A for each IO supply (number depends on which X90 you are using) ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/d/db686d21975d0afd3ee893263f5f0ba79f42bf0f.jpeg) Hi Currently there are no I/O connected out from the X90 - so only internal inrush is happening the architecture is as the image above we power all voltage rails - and only when powering the enable signal - the Orion XS1400 drops the output voltage and the X90 restarts so it goes to a reboot cycle forever ---
**Author:** ![christoph.altenbuchn](https://avatars.discourse-cdn.com/v4/letter/c/FF8800/32.png) [@christoph.altenbuchn](https://community.br-automation.com/u/christoph.altenbuchn)\ **Post date:** [April 30, 2026, 1:15pm UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/5 "2026-04-30T13:15:36Z")
Hello, what does the logger say, can you please provide a system dump? Is the Orion XS1400 suitable as a power supply? As far as I see it’s intended to be a battery charger. Please also try to only connect the pins X1.A.K3, X1.A.L2 & X1.A.C3. ---
**Author:** ![kazi](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kazi](https://community.br-automation.com/u/kazi)\ **Post date:** [April 30, 2026, 4:00pm UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/6 "2026-04-30T16:00:24Z")
![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/3/3bc0c3e694beca78e1fab3ff1c08de0f957314f7.png) connecting only F10,F15 and F17 - the X90 boot and stays up adding any of fuses F12,F13 F20 or F16 - the unit will boot again and again. one note - I have connected X1.A - C3 via F17 to the main power rail due to number of fuse limit. I am only using these I/Os (colored) in X1.A and not more than that - so if we can avoid any IO fuse - or can reduce the inrush - please let me know ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/7/7f876fb93df30ca84378268a9ebc3cbdff457398.png) I have this configuration: | **position** | **article no.** | | --- | --- | | Mainboard | X90CP174.48-00 | | Optionboard\_1 | X90IF720.04-00 | | Optionboard\_2 | X90RO440.05-00 | | Optionboard\_3 | X90RO440.05-00 | | Optionboard\_4 | X90AO410.08-00 | question: if we leave only the main board and the CAN expansion - would the inrush be much lower? _Moderator note: combined two posts for readability_ ---
**Author:** ![kazi](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kazi](https://community.br-automation.com/u/kazi)\ **Post date:** [May 3, 2026, 7:45am UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/8 "2026-05-03T07:45:15Z")
![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/b/bb446331a60af2d50894066cf424ea9250cb4afe.jpeg) this image was taken from another person seen the same issue when trying to power X90 from XS1400… ---
**Author:** ![christian.bauer](https://dub1.discourse-cdn.com/brcommunity/user_avatar/community.br-automation.com/christian.bauer/32/238_2.png) [@christian.bauer](https://community.br-automation.com/u/christian.bauer)\ **Post date:** [May 4, 2026, 5:32am UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/9 "2026-05-04T05:32:55Z")
Hi guy, the help is quite clear: [Technical data](https://help.br-automation.com/#/en/6/hardware/x90cp174.xx-00/technische_daten.html) ![image](https://europe1.discourse-cdn.com/brcommunity/original/2X/7/72bd93cecea4d956f05af3ca4f2356c09eceb3db.png) This is not a big problem using truck batteries, so when using power supplies the following is recommended: [Inrush current](https://help.br-automation.com/#/en/6/hardware/x90cp174.xx-00/einschaltstrom.html) > If the X90 mobile system is supplied with power from a power supply unit instead of a battery, > > it is important to ensure sufficient support capacity of ≥ 4700 µF. Using a battery charger to supply the X90 module is not an intended use case. Kind regards, Christian ---
**Author:** ![kazi](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kazi](https://community.br-automation.com/u/kazi)\ **Post date:** [May 4, 2026, 7:13am UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/10 "2026-05-04T07:13:24Z")
> [@christian.bauer](#): > > Using a battery charger to supply the X90 module is not an intended use case. Orion XS1400 has two modes- power supply and charger we use the power supply mode and not the charger do you have a recommendation for external capacitor that can feed the inrush? ---
**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:** [May 25, 2026, 6:09am UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/11 "2026-05-25T06:09:34Z")
HI @kazi have you found final solution for your issue? ---
**Author:** ![kazi](https://avatars.discourse-cdn.com/v4/letter/k/FF8800/32.png) [@kazi](https://community.br-automation.com/u/kazi)\ **Post date:** [May 25, 2026, 7:42am UTC](https://community.br-automation.com/t/reducing-x90-mobile-controller-inrush-current/11103/12 "2026-05-25T07:42:05Z")
I moved to a new DC2DC