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Mean Well 15V 5A

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TwinStar:
Our group is still a mix of DCC and RailPro. As such, I still need to provide DCC at the railhead. I have a Digitrax DB150 but I really don't want to pay $50 for their PS-14 power supply. Would the following work or is there something that I'm missing?

https://tinyurl.com/yb77rd7v

G8B4Life:
Meanwell is a good brand of power supply.

These are the full specs of the unit offered on eBay (note, the picture in the eBay ad is not of the RS-75-15, but of a higher powered model with dual rails, the RS-75-15 has a single output rail): http://www.meanwell.com/webapp/product/search.aspx?prod=RS-75

From what I can tell it should be just fine, the voltage is well within range of the DB-150 and the current rating just as good as the PS-514 Digitrax recommended for the DB-150. I can't tell exactly what protection mechanisms the PS-514 had so the Meanwell RS-75-15 may have less built in protection. You'll have to wire the input and output side yourself so you'll need to take precautions on the exposed live 115v input.

- Tim

Alan:
I have a combination of eBay China and genuine MeanWell power supplies in use on my railroad. All have been trouble free.



It matters how and where you mount the power supply. Non-fan cooled SPS should be mounted horizontally with free air space above and around the enclosure. The amperage rating is reduced 50% when mounted vertically. I overcame the vertical mount restriction on a 7 amp version of the supply you are considering by adding a fan. The fan is 24V so it runs ultra quiet on the 15V supply.



Noise caused me to add external fans to my fan cooled units too. The internal fans are quite noisy and the constant cycling on/off drew attention to their presence. The external fans run continuously and are quieter than the original power supply fans. They keep the units at temperatures below the internal fan cut-in point.

TwinStar:
Thanks guys. This will be for a Free-mo modular layout. Is there a way to make this safe and portable?

Alan:
Are there multiple power supplies on a Free-mo setup? If so, I would bail. Switch mode power supplies generally do not play well together especially if the output voltages are slightly different. They don't load share like batteries. There are SMPS that are meant to be ganged together but they are specialized and pricey.

If your power supply is the sole source of power then I can see no reason why it won't work well and be safe. Give it air space to shed heat. Make sure it is well grounded - use a grounded plug and outlet. Securely cover the electrical connections on the unit. Perhaps put an inline fuse on the output side just in case the internal over-current protection fails.

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