# Soft start on DC OEM box

**URL:** <https://forum.universal-robots.com/t/soft-start-on-dc-oem-box/18739>\
**Category:** Technical Questions\
**Tags:** electrical\
**Created:** [November 16, 2021, 6:53pm UTC](https://forum.universal-robots.com/t/soft-start-on-dc-oem-box/18739 "2021-11-16T18:53:56Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![anon5325216](https://avatars.discourse-cdn.com/v4/letter/a/ecc23a/32.png) [@anon5325216](https://forum.universal-robots.com/u/anon5325216)\
**Post date:** [November 16, 2021, 6:53pm UTC](https://forum.universal-robots.com/t/soft-start-on-dc-oem-box/18739/1 "2021-11-16T18:53:56Z")

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Could someone share please a product (soft start circuit) that can be bought? I’ve seen some videos how you can make one but I prefer to buy it.  
Or maybe 1-phase power supply, 230V AC that doesn’t need soft start. We have ur5 robot.

Thank you!

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**Author:** ![Ebbe](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/ebbe/32/1413_2.png) [@Ebbe](https://forum.universal-robots.com/u/Ebbe)\
**Post date:** [January 18, 2022, 1:32pm UTC](https://forum.universal-robots.com/t/soft-start-on-dc-oem-box/18739/2 "2022-01-18T13:32:19Z")

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You can by a solution here [https://www.digikey.dk/en/products/detail/ametherm/MM35-1R550-DIN/7652447](https://www.digikey.dk/en/products/detail/ametherm/MM35-1R550-DIN/7652447)

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**Author:** ![j.fowler](https://avatars.discourse-cdn.com/v4/letter/j/b5a626/32.png) [@j.fowler](https://forum.universal-robots.com/u/j.fowler)\
**Post date:** [July 3, 2023, 10:30am UTC](https://forum.universal-robots.com/t/soft-start-on-dc-oem-box/18739/4 "2023-07-03T10:30:15Z")

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@Ebbe I have a set up with a UR16e robot being powered by a MiR100 on an extended battery. With the circuit open to the DC/DC power supply powering the UR it is often hard to power up the MiR, sometimes taking a up to 5 presses of the start button. Whereas when the UR is isolated from the MiR it starts first time.

I have a feeling this is due to high inrush current to the UR’s DCDC power supply. Would the digikey product here be a sensible inclusion on our installation?

Kind Regards,  
James

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**Author:** ![Ebbe](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/ebbe/32/1413_2.png) [@Ebbe](https://forum.universal-robots.com/u/Ebbe)\
**Post date:** [July 3, 2023, 11:09am UTC](https://forum.universal-robots.com/t/soft-start-on-dc-oem-box/18739/5 "2023-07-03T11:09:06Z")

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Hi @j.fowler,

Yes, if the inrush is the cause, then it should improve the issue.

Best regards  
Ebbe

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<div class="post-metadata">

**Author:** ![Ebbe](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/ebbe/32/1413_2.png) [@Ebbe](https://forum.universal-robots.com/u/Ebbe)\
**Post date:** [July 3, 2023, 11:09am UTC](https://forum.universal-robots.com/t/soft-start-on-dc-oem-box/18739/6 "2023-07-03T11:09:17Z")

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Closed on July 3, 2023, 11:09am UTC