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Date: 15 Jan 2007 10:45:57
From:
Subject: PID-ing Silva
As I am trying to PID Silva I need to install a Solid State Relay
aswell, as everybody knows. But are there someone here who knows the
difference between open zero and closed zero on those SSR. Is it of any
importance to use one of them? The PID is a Watlow 69.//Giovanni.





 
Date: 16 Jan 2007 08:11:18
From: daveb
Subject: Re: PID-ing Silva
no need to be sorry. this is a rather exotic subject.
Ciao
dave



 
Date: 16 Jan 2007 00:22:29
From:
Subject: Re: PID-ing Silva

Ian Smith skrev:

> On Mon, 15 Jan 2007 11:39:55 -0800, I->Ian <someone@nowhere.com> wrote:
> >
> > <johan.bore@telia.com> wrote in message
> > news:1168886757.176297.303690@11g2000cwr.googlegroups.com...
> > > As I am trying to PID Silva I need to install a Solid State Relay
> > > aswell, as everybody knows. But are there someone here who knows the
> > > difference between open zero and closed zero on those SSR. Is it of a=
ny
> > > importance to use one of them? The PID is a Watlow 69.//Giovanni.
> >
> > I'll take a bit of liberty and assume you mean ZeroCrossing : The unit
> > switches states when there is ZERO voltage across it.
> >
> > For EMI considerations, Zero Crossing is preferred.
>
> If that's what he means, for lifetime of both SSR and element, zero
> crossing is preferred. However, I'm far from convinced that is what
> he means, though I have no better ideas - I've never heard teh term.
>
> regards, Ian SMith
> --
>


 
Date: 15 Jan 2007 16:13:21
From: daveb
Subject: Re: PIDing Silva
hmmm, normally OPEN would probably be best.

d



 
Date: 15 Jan 2007 11:39:55
From: I->Ian
Subject: Re: PID-ing Silva

<johan.bore@telia.com > wrote in message
news:1168886757.176297.303690@11g2000cwr.googlegroups.com...
> As I am trying to PID Silva I need to install a Solid State Relay
> aswell, as everybody knows. But are there someone here who knows the
> difference between open zero and closed zero on those SSR. Is it of any
> importance to use one of them? The PID is a Watlow 69.//Giovanni.
>

I'll take a bit of liberty and assume you mean ZeroCrossing : The unit
switches states when there is ZERO voltage across it.

For EMI considerations, Zero Crossing is preferred.




  
Date: 15 Jan 2007 22:11:29
From: Ian Smith
Subject: Re: PID-ing Silva
On Mon, 15 Jan 2007 11:39:55 -0800, I- >Ian <someone@nowhere.com> wrote:
>
> <johan.bore@telia.com> wrote in message
> news:1168886757.176297.303690@11g2000cwr.googlegroups.com...
> > As I am trying to PID Silva I need to install a Solid State Relay
> > aswell, as everybody knows. But are there someone here who knows the
> > difference between open zero and closed zero on those SSR. Is it of any
> > importance to use one of them? The PID is a Watlow 69.//Giovanni.
>
> I'll take a bit of liberty and assume you mean ZeroCrossing : The unit
> switches states when there is ZERO voltage across it.
>
> For EMI considerations, Zero Crossing is preferred.

If that's what he means, for lifetime of both SSR and element, zero
crossing is preferred. However, I'm far from convinced that is what
he means, though I have no better ideas - I've never heard teh term.

regards, Ian SMith
--


   
Date: 15 Jan 2007 23:14:36
From: Barry Jarrett
Subject: Re: PID-ing Silva
On 15 Jan 2007 22:11:29 GMT, Ian Smith <ian@astounding.org.uk > wrote:

>On Mon, 15 Jan 2007 11:39:55 -0800, I->Ian <someone@nowhere.com> wrote:
>>
>> <johan.bore@telia.com> wrote in message
>> news:1168886757.176297.303690@11g2000cwr.googlegroups.com...
>> > As I am trying to PID Silva I need to install a Solid State Relay
>> > aswell, as everybody knows. But are there someone here who knows the
>> > difference between open zero and closed zero on those SSR. Is it of any
>> > importance to use one of them? The PID is a Watlow 69.//Giovanni.
>>
>> I'll take a bit of liberty and assume you mean ZeroCrossing : The unit
>> switches states when there is ZERO voltage across it.
>>
>> For EMI considerations, Zero Crossing is preferred.
>
>If that's what he means, for lifetime of both SSR and element, zero
>crossing is preferred. However, I'm far from convinced that is what
>he means, though I have no better ideas - I've never heard teh term.


perhaps he's meaning "normally open" and "normally closed"??


 
Date: 15 Jan 2007 11:24:56
From: daveb
Subject: Re: PID-ing Silva
of no importance.

use one rated 25 A or better.

dave