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snwcmpr
08/18/2019 4:31 AM
Awesome I sent an email to AllenB and JackH The email to JackH failed. I had screenshots of my settings.

allenb
08/18/2019 3:37 AM
Jack and I are enlisting help from our PHP site admin to try and solve as soon as possible. Thanks for letting us know.

snwcmpr
08/18/2019 2:53 AM
I got another PM last night......... No email notice.

snwcmpr
08/17/2019 7:36 AM
Email address correct. I constantly check junk folder. I turned off, then on, the setting to receive notice.

JackH
08/17/2019 7:10 AM
Also check that there are no spam filters set for email.

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SSR & Random Fire SSr
CharcoalRoaster
SSR question here --

These are the ones I currently have in my build. Are they suitable?

https://www.ebay....2856886716

25A for my AC fan and 40A for my heater.

Thanks!
 
renatoa
I am using the 25A version for 1300W ([email protected]), without heatsink, barely warm.

Already warned that you should expect to find 12A triac inside, and probably 16A for the model labelled 40A, so don't plan to use them for more than 1/3 of advertised current rating.

What motor type has a fan to be controlled using such SSR? What control method? PAC/ICC ?
IO3 PWM is for DC motors only I think...
 
CharcoalRoaster
It's an AC vac motor fan.

So are you saying I cannot use the labeled 40A on my 30amp breaker for my heater (240v @4500w)?
 
mg512
CharcoalRoaster wrote:

It's an AC vac motor fan.

So are you saying I cannot use the labeled 40A on my 30amp breaker for my heater (240v @4500w)?


For the heater: In theory you can use it, IF the SSR is actually what it says on the label. If you're getting one from eBay that is far from guaranteed. Since you'd be pulling almost 20A, it might be a good idea getting an SSR from an official distributor in this instance, even if it costs a little more.

For the motor: If you're planning to use this with a ZCD for speed control (as opposed to simply on-off control), then no, you cannot use a regular SSR. You need a "random-fire SSR".
 
https://www.tindie.com/products/15798/
CharcoalRoaster
Ok good to know -- what are some brands of trustworthy SSRs?
 
renatoa
Aren't these what we call random fire SSR?
The schematic inside is simple, an moc 40xx optotriac and a BTA 12/16-600-800V triac, check here at 4:30

https://youtu.be/...ifyY?t=270

Nothing in the schematic that could suggest a ZCD feature...

[email protected] is less than 20A.
For such task I would rather buy myself components I can trust, i.e. separate triac (BTA41-600BRG-$4) and optotriac (50c) and build the SSR on a small board.
Edited by renatoa on 06/02/2019 7:16 PM
 
mg512
CharcoalRoaster wrote:
Ok good to know -- what are some brands of trustworthy SSRs?


I wouldn't worry about brand, just make sure you buy them from a reputable distributor, e.g. Digikey, Mouser, Farnell, Arrow. If you get them from a random eBay seller, you can't know for sure if what's inside matches what's on the label. Not an issue with other things, but with mains voltage and high current, it's better to be safe than sorry.



renatoa wrote:
Aren't these what we call random fire SSR?
The schematic inside is simple, an moc 40xx optotriac and a BTA 12/16-600-800V triac, check here at 4:30


I don't know about these specifically, but I was under the impression that most SSRs were the zero-crossing variety, unless explicitly stated that they are random-fire. You can try, of course.

renatoa wrote:
For such task I would rather buy myself components I can trust, i.e. separate triac (BTA41-600BRG-$4) and optotriac (50c) and build the SSR on a small board.


I would strongly advise against this. Do not mess with mains electricity if you don't know precisely what you are doing. It is much safer to buy an SSR from a reputable source.
 
https://www.tindie.com/products/15798/
renatoa
Fotek surely aren't zero crossing. And here they are "the most" Grin

That's because the next similar SSR, Panasonic brand, from a reputable seller, Farnell, is 10x more expensive... so only industrial projects consider them, we the hobbyists are using Chinese stuff, with the necessary margin.

Isn't supposed that we are knowing precisely what are we doing ? Grin
 
CharcoalRoaster
Thanks once again everyone -- I found some new Crydom 120v 25A random fire SSRs for fan control and a couple new crydom 240v 50A zero cross for the heaters. I have a new one to install a a backup in case of failure.
 
Wiz Kalita
renatoa wrote:

Aren't these what we call random fire SSR?
The schematic inside is simple, an moc 40xx optotriac and a BTA 12/16-600-800V triac, check here at 4:30


That's a Fotek SSR-25DA, which is zero-crossing. The 25VA is the random fire version.

http://www.fotek..../SSR-1.htm
http://www.servo....s_adju.pdf
Edited by JackH on 06/08/2019 10:54 AM
 
renatoa
Then is a Fotek fake/clone, because in the video schematic, and what I dismounted myself there is no element to perform zcd function.
The difference can be seen here: https://i.stack.i.../YeUTf.png

The SSR from the video use a simple optotriac to fire the main triac.

This page don't tell anything about VA series as being random fire, but variable resistor controlled in AC:
http://www.viira1...ek/ssr.htm

The resistor symbol is engraved on the SSR case, and the input pins have sine wave symbols, check attached.
renatoa attached the following image:
25va.jpg

Edited by renatoa on 06/08/2019 8:46 AM
 
mg512
renatoa wrote:
This page don't tell anything about VA series as being random fire, but variable resistor controlled in AC:
http://www.viira1...ek/ssr.htm

That very page does, however, seem to say that the entire series has "Zero Cross Trigger Method".

This kind of confusion is precisely why I recommend (a) using reputable brands and distributors, where you can actually find an accurate datasheet, or (b) avoiding the entire ZCD / random-fire SSR route altogether.
 
https://www.tindie.com/products/15798/
NewBean
Ok this is what I'm building, am I correct or off base

1-https://www.amazo...amp;sr=8-5

2-https://www.mouse...K6L1K8TA==
Edited by JackH on 06/09/2019 8:49 AM
 
mg512
The D2425-10 should be the instant-turnon aka random-fire variant, so you should be good. You will still need a ZCD if you go this way.

May I suggest we move the random-fire SSR and ZCD discussion to a separate thread? I think given the amount if interest, it very much deserves its own discussion.
 
https://www.tindie.com/products/15798/
NewBean
Guess we're moving this topic to a new section, was not able to find one so here goes..
 
renatoa
Would be nice to have here the posts from the other thread too, no idea if this forum allows moving posts from a thread to other...
 
JackH
Yes, the posts can be moved and I did it. Also moved to the dataloggers area.
---Jack

KKTO Roaster.
 
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