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Crydom Failure

Posted: Tue May 31, 2016 9:23 pm
by 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.

Image

Re: Crydom Failure

Posted: Tue May 31, 2016 10:03 pm
by 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.

Re: Crydom Failure

Posted: Wed Jun 01, 2016 6:40 am
by 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...

Re: Crydom Failure

Posted: Wed Jun 01, 2016 6:51 am
by noventix
Xenocrates wrote: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!

Re: Crydom Failure

Posted: Wed Jun 01, 2016 12:29 pm
by 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.

Re: Crydom Failure

Posted: Wed Jun 01, 2016 5:17 pm
by 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

Re: Crydom Failure

Posted: Wed Jun 01, 2016 9:30 pm
by 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!

Re: Crydom Failure

Posted: Wed Jun 01, 2016 11:09 pm
by gchristopher
Ouch, sorry. The dinosaurs also went with Mouser for a Crydom D1D40. The results were great.

Re: Crydom Failure

Posted: Thu Jun 02, 2016 9:22 pm
by noventix
LOVE the dinosaur build! Can't believe I have not seen that before. Will be referencing that when my replacement Crydom arrives. Thanks!

Re: Crydom Failure

Posted: Thu Jun 09, 2016 8:41 pm
by 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.

Re: Crydom Failure

Posted: Thu Jun 09, 2016 9:17 pm
by 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.

Re: Crydom Failure

Posted: Thu Jun 09, 2016 9:40 pm
by 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.