# Meanwell SPV-300-48 power supply standalone operation **URL:** \ **Category:** Power Supplies (off-board)\ **Tags:** power-supplies-external-internal-off-board, mean-well, power\ **Created:** [June 28, 2022, 8:41pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422 "2022-06-28T20:41:40Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![EmiAudio](https://avatars.discourse-cdn.com/v4/letter/e/67e7ee/32.png) [@EmiAudio](https://forum.digikey.com/u/EmiAudio)\ **Post date:** [June 28, 2022, 8:41pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/1 "2022-06-28T20:41:40Z")
Using this power supply to replace a SP-300-48. The SPV has two terminals that the original doesn’t have. RC and PV. What do I do with these terminals if I just want continuous output from the power supply? It doesn’t work with these terminals floating. ---
**Author:** ![Nathan\_2268](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/nathan_2268/32/1883_2.png) [@Nathan\_2268](https://forum.digikey.com/u/Nathan_2268)\ **Post date:** [June 28, 2022, 8:50pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/2 "2022-06-28T20:50:15Z")
@EmiAudio Looking over the PDF data-sheet, I am not seeing “PV” listed on page 3. Could you clarify which termination you are referencing? > **[MSP-300-spec.pdf](https://www.meanwellusa.com/upload/pdf/MSP-300/MSP-300-spec.pdf)** > > 577.12 KB ---
**Author:** ![EmiAudio](https://avatars.discourse-cdn.com/v4/letter/e/67e7ee/32.png) [@EmiAudio](https://forum.digikey.com/u/EmiAudio)\ **Post date:** [June 28, 2022, 9:02pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/3 "2022-06-28T21:02:53Z")
Thats the wrong one. Its a SPV not MSP. [SPV-300-spec.pdf](https://forum.digikey.com/uploads/short-url/5XDivmEcnmv6H1lk6ss1tYwPgvG.pdf) (187.5 KB) ---
**Author:** ![Steven\_14444](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/steven_14444/32/47465_2.png) [@Steven\_14444](https://forum.digikey.com/u/Steven_14444)\ **Post date:** [June 28, 2022, 9:45pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/4 "2022-06-28T21:45:12Z")
It looks like there is confusion for your original power supply. When entering SP-300-48 on Digi-Key there is a MeanWell power supply that is MSP-300-48. It looks like your original power supply is a Arndt Electronics power supply which we do not carry. Looking at pg 3, PV will need to be connected to V- with a pot to set the voltage. ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [June 28, 2022, 9:58pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/5 "2022-06-28T21:58:28Z")
Hi @EmiAudio, RC Terminal (Remote Control) can float or be tied to 0 volts to remain on: ![image](https://global.discourse-cdn.com/digikey/original/3X/c/e/ceaebef9ed7b30f0f0f9fb47d9d454e2f5388b3b.png) * * * I believe is the voltage difference between the PV terminal and the -V terminal is the +1v ~ +5.5v which can be shorted, run through potentiometer, or supplied by an external voltage source in order to turn the supply ON (locally or remotely): ![image](https://global.discourse-cdn.com/digikey/original/3X/0/6/062345a78fe3138d1107b7e38cb32d5d75e1a448.png) ![image](https://global.discourse-cdn.com/digikey/original/3X/2/a/2a42982643a91127fa73f198109eeda95a097526.png) ![image](https://global.discourse-cdn.com/digikey/original/3X/6/a/6a7c972e132c8a8f9dbc022704599f46fff0f1e0.png) ---
**Author:** ![EmiAudio](https://avatars.discourse-cdn.com/v4/letter/e/67e7ee/32.png) [@EmiAudio](https://forum.digikey.com/u/EmiAudio)\ **Post date:** [June 29, 2022, 4:33pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/6 "2022-06-29T16:33:04Z")
Yeah, you have to supply an external control voltage to the PV terminal. This isn’t going to work. ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [June 29, 2022, 7:27pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/7 "2022-06-29T19:27:45Z")
Hi @EmiAudio , Thank you for your reply. Using a pot, or simply shorting out the PV and -V terminals should work to turn on the supply. If this does not work, one of below options may be a better fit for you, please review datasheet before ordering to make sure it meets your criteria: [Click here for 1866-4270-ND | 1145-1154-ND | 1866-2722-ND | 1145-1154-ND | 1866-HRP-300N-48-ND | 1866-4270-ND | 102-VGS-350C-48-ND | 1866-3350-ND](https://www.digikey.com/en/products/filter/ac-dc-converters/133?s=N4IgTCBcDaIIwA4BsSC0AWMB2ADKgcgCIAEAPsXHOgKyqXXoEnmIqrZhhNkVW32MiPVmgASAJQAKqAMw4c%20DAm4tkaTLhUUcXAGoBxAMqzqOAMJKtI2TNNMQAXQC%20QA) -Please let us know if you have any further questions. ---
**Author:** ![EmiAudio](https://avatars.discourse-cdn.com/v4/letter/e/67e7ee/32.png) [@EmiAudio](https://forum.digikey.com/u/EmiAudio)\ **Post date:** [June 30, 2022, 3:28pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/8 "2022-06-30T15:28:11Z")
I tried shorting the terminals as described and also tried different values of resistors. The power comes up for a second then collapses. I’m pretty sure you need an external power source of like 1-5v to get it working. Will I be able to return this part for credit? Thanks for the suggestions. I’ll look them over. ---
**Author:** ![Ryan\_2724](https://sea2.discourse-cdn.com/digikey/user_avatar/forum.digikey.com/ryan_2724/32/1716_2.png) [@Ryan\_2724](https://forum.digikey.com/u/Ryan_2724)\ **Post date:** [June 30, 2022, 4:07pm UTC](https://forum.digikey.com/t/meanwell-spv-300-48-power-supply-standalone-operation/23422/9 "2022-06-30T16:07:23Z")
Hello @EmiAudio , I forgot to mention something very basic, these power supplies usually have a little red switch on them for selecting either 120v or 220v input, and are usually factory set to 220v, please make sure this switch is set correctly. Regarding a return, please see: [https://www.digikey.com/mydigikey/returns](https://www.digikey.com/mydigikey/returns)