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Old 08-28-2010, 07:55 PM   #11
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If you are working with AC and a zero crossing SSR, then I would not recommend much faster than a 1 second cycle time. If you decrease it you heat up the SSR a little more and you lose resolution on your 0-100% scale due to the 60Hz AC.

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Old 08-28-2010, 11:16 PM   #12
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Quote:
Originally Posted by jfkriege View Post
If you are working with AC and a zero crossing SSR, then I would not recommend much faster than a 1 second cycle time. If you decrease it you heat up the SSR a little more and you lose resolution on your 0-100% scale due to the 60Hz AC.

I thought this might be the case. Thanks.
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Old 08-28-2010, 11:31 PM   #13
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Quote:
Originally Posted by bmckee56 View Post
Just did some googling on the device you are refering to. Unless you are into line programming and have some micro -electronics capability, give the sites I listed above a shot, you will save yourself a lot of time and headaches (IMHO).

Salute!
@bmckee I will have to check out the variable SSR, I didn't know there was such a device. As far as programming the Arduino, that is another hobby of mine, just wish I would have paid closer attention in circuits class back in college. I love hands on brewing, but automation control is another passion of mine. Having a overkill automated brewing set-up is a pipe dream of mine. The Arduino is a great platform for getting started in using micro controllers and homebrewing is an awesome venue to integrate the use of micro controllers. The programming language is C based, but with alot of built in shortcuts. I suck at programming, but the Arduino makes life much easier. Here is the website if anyone is curious. http://www.arduino.cc/
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Old 08-28-2010, 11:58 PM   #14
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Quote:
I will have to check out the variable SSR, I didn't know there was such a device.
You can look at the RM1E series made by Carlo Gavazzi, with 4-20mA or 0-10V control input.
Just a phase angle control circuit.


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Old 08-29-2010, 12:06 AM   #15
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Quote:
Originally Posted by bmckee56 View Post
I use this device:



It is an analog to variable output SSR. I input a 4-20ma signal and get a 0-100% electical output to my heating element (24 - 120 VAC).
What is the part number?
Is it the RM1E series?

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Old 08-29-2010, 12:29 AM   #16
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I've been reading the spec sheet for the RM1E. That looks like the tits, a little pricey($79), but the tits none the less.

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Old 08-29-2010, 05:37 AM   #17
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Originally Posted by Hermit View Post
Pulse Width will do the same thing for him. Just like the surface burner of an electric stove. It pulses on and off. It doesn't have a reduced output in any other respect.
Are you sure? And bmckee those auber and such PID's operate on PWM.
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Old 08-29-2010, 02:13 PM   #18
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If you are willing to go with a cycle time of 1 Hz or slower, you can get 40A SSRs off of ebay for $16 shipped, including the heat sink. If you just want straight PWM, you can go with the Baktronics device (search for a link on HBT) and change out a capacitor and only be down another $12.

What is the purpose in having your $75 SSR?

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Old 08-29-2010, 03:21 PM   #19
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Are you sure? And bmckee those auber and such PID's operate on PWM.
Am I sure? 30+ years in the appliance repair industry, I'm pretty sure on how a surface burner switch on a stove works. So, yeah. They pulse on and off with a duty cycle that is longer than one second.
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Old 08-29-2010, 06:03 PM   #20
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Am I sure? 30+ years in the appliance repair industry, I'm pretty sure on how a surface burner switch on a stove works. So, yeah. They pulse on and off with a duty cycle that is longer than one second.
Hermit's right. I use a burner switch on one of my heatsticks and the on/off cycle is quite a few seconds long. This setup scores zero on sexy, but works well enough.
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