Crydom Failure

[noventix]

Hi experts

I am trying to wire up a Meanwell 24V power supply, along with a Crydom D1D40 and a 24-12V converter. The converter is working great and the Rambo works as expected, but the Crydom is not operating right. It is registering 24V regardless of whether it is getting a signal or not. Even with nothing connected on the input side, there is 24V present on the output side.

Is the SSR fried? Sadly I bought this used from eBay so am suspecting a faulty unit. I have double checked my wiring and am sure it is all wired correctly. This is someone else's image, but is how I am wired up.

[Xenocrates]

You've likely bought a cheap clone with a fake badge, if not an outright fake. The Bay of thieves is a bad place to buy low bulk high price parts like SSRs. instead, I suggest you buy a http://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=288. They are cheap, and known to work well, even without a heatsink. Mike and several others use them, and they are more than rated for what you're doing.

[DeltaCon]

Oeh... Wish I knew that before. I have a Crydom laying around waiting for the next upgrade-time, and got it through ebay as well. I choose the Crydom because it is well advised in this forum. Hop I have a good one...

[noventix]

You've likely bought a cheap clone with a fake badge, if not an outright fake. The Bay of thieves is a bad place to buy low bulk high price parts like SSRs. instead, I suggest you buy a http://www.auberins.com/index.php?main_page=product_info&cPath=2_30&products_id=288. They are cheap, and known to work well, even without a heatsink. Mike and several others use them, and they are more than rated for what you're doing.

I was worried about that with eBay. Lesson learned. I will check out that unit. Thanks!

[Eaglezsoar]

The advice from Xenocrates is spot on, I use what he recommends and have no problems.
Those cheap ssr's you find on Ebay have even caught on fire and are NOT recommended for any use.

[KAS]

I'm using the Crydom D1D40. I'm sure it can be found cheaper, but I trust Mouser more than ebay.


http://www.mouser.com/ProductDetail/Cry ... j0cw%3D%3D

[noventix]

Thanks for the advice all ... I hope at least others can learn from this and avoid eBay for these types of items. The alternative that Xenocrates listed was out of stock, so I ordered a brand new Crydom D1D40 from Arrow Electronics. It should be here by Friday so the build can continue.

I love these forums!

[gchristopher]

Ouch, sorry. The dinosaurs also went with Mouser for a Crydom D1D40. The results were great.

[noventix]

LOVE the dinosaur build! Can't believe I have not seen that before. Will be referencing that when my replacement Crydom arrives. Thanks!

[noventix]

I am happy to report that the Crydom from Arrow Electronics works great. Looking at the new one side-by-side with the old, it is now easy to see it was a fake.

Do NOT buy one of these from eBay.

[IMBoring25]

In fairness, Crydom has gone through a few different mostly-cosmetic revisions of that SSR. Just looking different doesn't mean the other one was a fake (especially since it was used and would likely have been an older version)...But it doesn't mean it wasn't either.

[noventix]

Good point. It is quite possible this was a legit unit. I think the message here is that given the importance of this component, it is probably worth the investment in getting a new one from a reputable source.