Solid State Relays
Archiver
Posts: 46,084
Hello
What I need to do is switch a 120 vac load fairly often. More often
than I'd like to subject a mechanical relay to so I've decided solid
state relays are probably the solution however a couple of questions
I'm sure somebody on here will be able to help me with. First can I
drive a relay directly from the stamp i.e is it isolated enough not
to cause damage to my stamp. Also are they a current opperated device
or a voltage operated.
Thank You
Aaron
What I need to do is switch a 120 vac load fairly often. More often
than I'd like to subject a mechanical relay to so I've decided solid
state relays are probably the solution however a couple of questions
I'm sure somebody on here will be able to help me with. First can I
drive a relay directly from the stamp i.e is it isolated enough not
to cause damage to my stamp. Also are they a current opperated device
or a voltage operated.
Thank You
Aaron
Comments
Another option is to use an opto-isolated triac.
The required forward diode current can be supplied
directly by the stamp via a series resistor.
Keep the high voltages on your board away from
low voltage signals for at least 6mm for safety.
greetings peter
Oorspronkelijk bericht
Van: Aaron [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=-fJN-SQkph2chSz6dnYWHHjuglpZuFGeYptb_iyQFJekrLzhV9nNnFmTRkKaPlq5VbCOk_gPoHz1P5g]snazzyguy2@y...[/url
Verzonden: dinsdag 18 september 2001 05:48
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] Solid State Relays
Hello
What I need to do is switch a 120 vac load fairly often. More often
than I'd like to subject a mechanical relay to so I've decided solid
state relays are probably the solution however a couple of questions
I'm sure somebody on here will be able to help me with. First can I
drive a relay directly from the stamp i.e is it isolated enough not
to cause damage to my stamp. Also are they a current opperated device
or a voltage operated.
Thank You
Aaron
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
Original Message
> From: Chris Loiacono [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4zuRYgQDMj6BgOwqlpr-7DsRI59j3qtE85n2n03WIpwrgACQDC_E4E5L9LnlbGNlBiwLNwnb_DjJbg]chris@m...[/url
> Sent: Tuesday, September 18, 2001 9:32 AM
> To: 'basicstamps@yahoogroups.com'
> Subject: RE: [noparse][[/noparse]basicstamps] Solid State Relays
>
>
> Aaron:
>
> There are many ways to do this, including solid-state relays.
> How much current are you switching, and what kind of load is
> it (ie: resistive, inductive...) If you like, I can send you
> a sketch of some very simple, time-proven methods that use a
> few inexpensive components instead of you having to select an
> SSR. With a few adaptations, you'll be able to do isolated
> switching of a variety of AC load types for pennies from your
> own toolbox afterward...
>
> Chris
>
> >
Original Message
> > From: Aaron [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=vzNaOJzTejVB2cK4tisomADG4qIzS-HsVzrwirKr3gKn9UZpdGErG2-6jyZHFucu3ZyFXcdAY-vJY411]snazzyguy2@y...[/url
> > Sent: Tuesday, September 18, 2001 12:48 AM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] Solid State Relays
> >
> >
> > Hello
> >
> > What I need to do is switch a 120 vac load fairly often. More often
> > than I'd like to subject a mechanical relay to so I've
> decided solid
> > state relays are probably the solution however a couple of
> questions
> > I'm sure somebody on here will be able to help me with. First can I
> > drive a relay directly from the stamp i.e is it isolated enough not
> > to cause damage to my stamp. Also are they a current
> opperated device
> > or a voltage operated.
> >
> > Thank You
> > Aaron
> >
> >
>
can be turned on with 3 ma @ 5vdc
but they cost around $40 to $60 each. They switch the AC at zero crossing .
chris01@t... wrote:
>
> > Aaron:
> >
> > There are many ways to do this, including solid-state relays.
> > How much current are you switching, and what kind of load is
> > it (ie: resistive, inductive...)
> >
> > >
Original Message
>
> > > Hello
> > >
> > > What I need to do is switch a 120 vac load fairly often. More often
> > > than I'd like to subject a mechanical relay to so I've
I would very much like to see a copy of that sketch.
Andy
Original Message
From: <chris01@t...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, September 18, 2001 8:43 AM
Subject: FW: [noparse][[/noparse]basicstamps] Solid State Relays
>
>
> >
Original Message
> > From: Chris Loiacono [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=hf4SMBw5sa9ZOld0YKYX6fAbWJgHuCapHrt3ymy4KI9_-bNzjhzh-LDCaTgArY55MkHoG8apwyt0]chris@m...[/url
> > Sent: Tuesday, September 18, 2001 9:32 AM
> > To: 'basicstamps@yahoogroups.com'
> > Subject: RE: [noparse][[/noparse]basicstamps] Solid State Relays
> >
> >
> > Aaron:
> >
> > There are many ways to do this, including solid-state relays.
> > How much current are you switching, and what kind of load is
> > it (ie: resistive, inductive...) If you like, I can send you
> > a sketch of some very simple, time-proven methods that use a
> > few inexpensive components instead of you having to select an
> > SSR. With a few adaptations, you'll be able to do isolated
> > switching of a variety of AC load types for pennies from your
> > own toolbox afterward...
> >
> > Chris
> >
> > >
Original Message
> > > From: Aaron [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=r3sSTJh02rZ86JuYLe_0arOsgyIT37K7q-dM3G32KnhDom5E14Jxpxly-IExhx_J4ijtWZPgiKqmPIVCyZo]snazzyguy2@y...[/url
> > > Sent: Tuesday, September 18, 2001 12:48 AM
> > > To: basicstamps@yahoogroups.com
> > > Subject: [noparse][[/noparse]basicstamps] Solid State Relays
> > >
> > >
> > > Hello
> > >
> > > What I need to do is switch a 120 vac load fairly often. More often
> > > than I'd like to subject a mechanical relay to so I've
> > decided solid
> > > state relays are probably the solution however a couple of
> > questions
> > > I'm sure somebody on here will be able to help me with. First can I
> > > drive a relay directly from the stamp i.e is it isolated enough not
> > > to cause damage to my stamp. Also are they a current
> > opperated device
> > > or a voltage operated.
> > >
> > > Thank You
> > > Aaron
> > >
> > >
> >
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com
Is there a way to switch a triac faster than 60cps? Perhaps something like
staying under a "latching" spec? Any idea where I can find a comprehensive
tutorial on triacs?
Andy
Original Message
From: "Scott Tappan Contractor" <scott.tappan.contractor@n...>
To: <basicstamps@yahoogroups.com>
Sent: Tuesday, September 18, 2001 10:02 AM
Subject: Re: FW: [noparse][[/noparse]basicstamps] Solid State Relays
> We use this Crydom brand ( http://www.crydom.com/assets/ssrpan/s1.pdf )
they can be turned on with 3 ma @ 5vdc
> but they cost around $40 to $60 each. They switch the AC at zero crossing
.
>
> chris01@t... wrote:
>
> >
> > > Aaron:
> > >
> > > There are many ways to do this, including solid-state relays.
> > > How much current are you switching, and what kind of load is
> > > it (ie: resistive, inductive...)
> > >
> > > >
Original Message
> >
> > > > Hello
> > > >
> > > > What I need to do is switch a 120 vac load fairly often. More often
> > > > than I'd like to subject a mechanical relay to so I've
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
_________________________________________________________
Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com
article in general about triacs.
Search www.google.com for triac and there is all kinds of
information on triacs. in a quick search I
couldnt find any specs on switching speed as such. since a triac will not turn
off until zero crossing is met I
guess that you cant switch any faster than your signal.
andy wrote:
> Scott,
>
> Is there a way to switch a triac faster than 60cps? Perhaps something like
> staying under a "latching" spec? Any idea where I can find a comprehensive
> tutorial on triacs?
>
> Andy
>
series from SHARP. Doc can be reach on the net.
This classic component is in fact a triac driven by LED.
As others outputs of my project, and for safe, This led is driven from Stamp
through an ULN2803. The ULN2803 can drive relay without problem (iddle diode
built in).
Everything is OK in this cases.
Sketch could be sent to you.
Christian
[noparse][[/noparse]Non-text portions of this message have been removed]
>
> I would very much like to see a copy of that sketch.
>
> Andy
>
>
OK, resistive load first:
MOC30XX 200 - 500 ohm LOAD
1 ----/\/\/\/
|-6---\/\/\----|----\/\/\/\--|
+5V | | | |
(controlled | | MT1 | |
output) | _____ _____ |
\|/ ___\ \/ /\ \/ /\ TRIAC 120VAC
--- /
|
| | G/ | MT2 |
| | / | |
2
|-4
/ |
|
logic Gnd
You can isolate your switching through an opto-isolator chip like the MOC
3010, which is rated for 120VAC on the output side. The resistor at the top
left simply sets the current for the MOC's LED, and should be selected as if
you were going to light any other LED. I think the MOC's will fire between 5
and 50 mA, so just use ohms law and let your stamp output do it's thing. The
MOC3010 outputs through an internal Triac, and the gate current (which is
the same as the MOC output current)is set with the 200-500 ohm resistor at
pin 6. I always say "check the data sheet". While I think the Triac gate can
handle up to 1 Amp, the MOC output handles somewhat less. The 180 ohm
resistor keeps it well below that- Just be sure to use a 1 Watt resistor or
larger if you use th 180 value. Then connect your load as shown. This will
run all day and night considering that the Triac you select is sized
properly and heat-sinked if you are drawing any appreciable current through
it. I often use 8 & 10 Amp TO-220 triacs in this circuit from Digi-key,
Mouser, and elsewhere. There is even a 6A version available on the shelf at
Rat-Shack if you become desperate. (I believe they also sell MOC3010's now
also).
You can adapt a wide range of different opto chips to this scheme for
different CTR results and random or zero-cross gating.
If you want to use something similar for an inductive load, just add a
resistor and cap for some snubbing:
MOC30XX 180-510 1k LOAD
1 ----/\/\/\/
|-6-\/\/\--/\/\/\---|----\/\/\/\--|
+5V | | | | |
(controlled | | | MT1 | |
output) | _____ | _____ |
\|/ ___\ \/ /\ --- \/ /\ TRIAC 120VAC
--- /
---
|
| | |.2uF G/ | MT2 |
| | | / | |
2
|-4
/ | |
logic Gnd | | |
|
|
|
Just be sure to note that the .2 cap must be rated for the AC voltage, and
that it is NOT connected to the gate terminal - it's hard to show that in
ascii text.
If you check your component ratings, these will last a long time. The MOC's
will provide hundreds of volts of protection for your stamp pin. Have fun at
www.fairchildsemi.com looking through your choices of optocouplers.
I hope this helps,
Chris
What you are talking about is commonly referred to as 'phase-control' and
it's done every day. All you need is an optoisolator that will output
'randomly'. Try the Teccor web site for a few real good tutorials.
Wow, this is a popular subject today. When everyone can do this AC stuff,
I'll need to find a new way to make a living...
Chris
>
Original Message
> From: ag [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=DQPv9abEwH8jnNfSwTpRyOB6LLW1ki1WSCV2kSV9HNsbP715dYZrzFdG97UtWDtI-LTZt-I4]ageaux@y...[/url
> Sent: Tuesday, September 18, 2001 12:15 PM
> To: basicstamps@yahoogroups.com
> Subject: Re: FW: [noparse][[/noparse]basicstamps] Solid State Relays
>
>
> Scott,
>
> Is there a way to switch a triac faster than 60cps? Perhaps
> something like
> staying under a "latching" spec? Any idea where I can find a
> comprehensive
> tutorial on triacs?
>
> Andy
>
>
Original Message
> From: "Scott Tappan Contractor" <scott.tappan.contractor@n...>
> To: <basicstamps@yahoogroups.com>
> Sent: Tuesday, September 18, 2001 10:02 AM
> Subject: Re: FW: [noparse][[/noparse]basicstamps] Solid State Relays
>
>
> > We use this Crydom brand
> http://www.crydom.com/assets/ssrpan/s1.pdf )
> they can be turned on with 3 ma @ 5vdc
> > but they cost around $40 to $60 each. They switch the AC at
> zero crossing
> .
> >
> > chris01@t... wrote:
> >
> > >
> > > > Aaron:
> > > >
> > > > There are many ways to do this, including solid-state relays.
> > > > How much current are you switching, and what kind of load is
> > > > it (ie: resistive, inductive...)
> > > >
> > > > >
Original Message
> > >
> > > > > Hello
> > > > >
> > > > > What I need to do is switch a 120 vac load fairly
> often. More often
> > > > > than I'd like to subject a mechanical relay to so I've
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in
> the Subject and
> Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> >
>
>
> _________________________________________________________
> Do You Yahoo!?
> Get your free @yahoo.com address at http://mail.yahoo.com
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>
>
>
Original Message
> From: Chris Loiacono [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=J54JgdoYttoW4-nQhMah1TSQzLdzbNpnv_vYmP9GH679qlqPee0oEk2lO2tgORYEXhiu1IfrpqxYYY-T]chris@m...[/urlOn Behalf Of
> chris01@t...
> Sent: Tuesday, September 18, 2001 4:49 PM
> To: 'basicstamps@yahoogroups.com'
> Subject: RE: FW: [noparse][[/noparse]basicstamps] Solid State Relays
>
>
> Andy,
> What you are talking about is commonly referred to as
> 'phase-control' and it's done every day. All you need is an
> optoisolator that will output 'randomly'. Try the Teccor web
> site for a few real good tutorials.
>
> Wow, this is a popular subject today. When everyone can do
> this AC stuff, I'll need to find a new way to make a living...
>
> Chris
>
> >
Original Message
> > From: ag [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=rvTtK8o8jHYPv_bz22Aqz-8U5nQYOMolOvawlAVkdEgs4ipa8rzX6G5SLuTOV1442xpCOCT51Cx2]ageaux@y...[/url
> > Sent: Tuesday, September 18, 2001 12:15 PM
> > To: basicstamps@yahoogroups.com
> > Subject: Re: FW: [noparse][[/noparse]basicstamps] Solid State Relays
> >
> >
> > Scott,
> >
> > Is there a way to switch a triac faster than 60cps? Perhaps
> > something like
> > staying under a "latching" spec? Any idea where I can find a
> > comprehensive
> > tutorial on triacs?
> >
> > Andy
> >
> >
Original Message
> > From: "Scott Tappan Contractor" <scott.tappan.contractor@n...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Tuesday, September 18, 2001 10:02 AM
> > Subject: Re: FW: [noparse][[/noparse]basicstamps] Solid State Relays
> >
> >
> > > We use this Crydom brand (
> > http://www.crydom.com/assets/ssrpan/s1.pdf )
> > they can be turned on with 3 ma @ 5vdc
> > > but they cost around $40 to $60 each. They switch the AC at
> > zero crossing
> > .
> > >
> > > chris01@t... wrote:
> > >
> > > >
> > > > > Aaron:
> > > > >
> > > > > There are many ways to do this, including solid-state relays.
> > > > > How much current are you switching, and what kind of load is
> > > > > it (ie: resistive, inductive...)
> > > > >
> > > > > >
Original Message
> > > >
> > > > > > Hello
> > > > > >
> > > > > > What I need to do is switch a 120 vac load fairly
> > often. More often
> > > > > > than I'd like to subject a mechanical relay to so I've
> > >
> > >
> > > To UNSUBSCRIBE, just send mail to:
> > > basicstamps-unsubscribe@yahoogroups.com
> > > from the same email address that you subscribed. Text in
> > the Subject and
> > Body of the message will be ignored.
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> > >
> >
> >
> > _________________________________________________________
> > Do You Yahoo!?
> > Get your free @yahoo.com address at http://mail.yahoo.com
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
> > Subject and Body of the message will be ignored.
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
> >
>
push buttons as inputs and a series of high current (340mA) LED's
attached on output pins connected through solid state relays. Problem
is is that in my mock-up I'm using a regular LED on the output of the
SSR and when triggered by a switch, turns on, but does not turn back
off after the puase is over unless power is manually removed from the
LED. The SSR stays latched in the on state even though the trigger
voltage is switched back to a low state. I can even remove the wires
to the input side of the SSR and it stays latched in the ON state
with the LED on. Does anyone know how to get it to turn off when it
is supposed to?
properly with dc good luck
--- chuckdrew <chuckdrew@y...> wrote:
> Here's a question for you guys. I've got a BS2p40
> that will have 12
> push buttons as inputs and a series of high current
> (340mA) LED's
> attached on output pins connected through solid
> state relays. Problem
> is is that in my mock-up I'm using a regular LED on
> the output of the
> SSR and when triggered by a switch, turns on, but
> does not turn back
> off after the puase is over unless power is manually
> removed from the
> LED. The SSR stays latched in the on state even
> though the trigger
> voltage is switched back to a low state. I can even
> remove the wires
> to the input side of the SSR and it stays latched in
> the ON state
> with the LED on. Does anyone know how to get it to
> turn off when it
> is supposed to?
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed.
> Text in the Subject and Body of the message will be
> ignored.
>
> Yahoo! Groups Links
>
>
> basicstamps-unsubscribe@yahoogroups.com
>
>
>
__________________________________
Do you Yahoo!?
Yahoo! Mail SpamGuard - Read only the mail you want.
http://antispam.yahoo.com/tools
--- In basicstamps@yahoogroups.com, kenneth magers
<kenneth_m_73149@y...> wrote:
> i beleave ssr are ac devices and with not switch
> properly with dc good luck
> --- chuckdrew <chuckdrew@y...> wrote:
> > Here's a question for you guys. I've got a BS2p40
> > that will have 12
> > push buttons as inputs and a series of high current
> > (340mA) LED's
> > attached on output pins connected through solid
> > state relays. Problem
> > is is that in my mock-up I'm using a regular LED on
> > the output of the
> > SSR and when triggered by a switch, turns on, but
> > does not turn back
> > off after the puase is over unless power is manually
> > removed from the
> > LED. The SSR stays latched in the on state even
> > though the trigger
> > voltage is switched back to a low state. I can even
> > remove the wires
> > to the input side of the SSR and it stays latched in
> > the ON state
> > with the LED on. Does anyone know how to get it to
> > turn off when it
> > is supposed to?
> >
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed.
> > Text in the Subject and Body of the message will be
> > ignored.
> >
> > Yahoo! Groups Links
> >
> >
> > basicstamps-unsubscribe@yahoogroups.com
> >
> >
> >
>
>
> __________________________________
> Do you Yahoo!?
> Yahoo! Mail SpamGuard - Read only the mail you want.
> http://antispam.yahoo.com/tools
Is it a latching type of SSR?
They make DC output SSR's' and that is what you should use. They have
transistor or FET output stages.
Hope this helps
Alan Bradford
Plasma Technologies
In a message dated 2/18/2004 7:50:53 PM Eastern Standard Time,
chuckdrew@y... writes:
Here's a question for you guys. I've got a BS2p40 that will have 12
push buttons as inputs and a series of high current (340mA) LED's
attached on output pins connected through solid state relays. Problem
is is that in my mock-up I'm using a regular LED on the output of the
SSR and when triggered by a switch, turns on, but does not turn back
off after the puase is over unless power is manually removed from the
LED. The SSR stays latched in the on state even though the trigger
voltage is switched back to a low state. I can even remove the wires
to the input side of the SSR and it stays latched in the ON state
with the LED on. Does anyone know how to get it to turn off when it
is supposed to?
[noparse][[/noparse]Non-text portions of this message have been removed]
wrote:
> Here's a question for you guys. I've got a BS2p40 that will have 12
> push buttons as inputs and a series of high current (340mA) LED's
> attached on output pins connected through solid state relays.
Problem
> is is that in my mock-up I'm using a regular LED on the output of
the
> SSR and when triggered by a switch, turns on, but does not turn
back
> off after the puase is over unless power is manually removed from
the
> LED. The SSR stays latched in the on state even though the trigger
> voltage is switched back to a low state. I can even remove the
wires
> to the input side of the SSR and it stays latched in the ON state
> with the LED on. Does anyone know how to get it to turn off when it
> is supposed to?
What happens when you pull the input to ground after it has been
turned on ?
It may be as simple as a a pulldown resistor on the line ?
Also, check the data sheets for the device carefully.
SSR's often have a minimum load to operate. Although 340mA is alot
for a Stamp, is it not a lot for a relay.
Seems one TIP120 could handle the whole lot with ease.
Dave
wrote:
> --- In basicstamps@yahoogroups.com, "chuckdrew" <chuckdrew@y...>
> wrote:
> > Here's a question for you guys. I've got a BS2p40 that will have
12
> > push buttons as inputs and a series of high current (340mA)
LED's
> > attached on output pins connected through solid state relays.
> Problem
> > is is that in my mock-up I'm using a regular LED on the output
of
> the
> > SSR and when triggered by a switch, turns on, but does not turn
> back
> > off after the puase is over unless power is manually removed
from
> the
> > LED. The SSR stays latched in the on state even though the
trigger
> > voltage is switched back to a low state. I can even remove the
> wires
> > to the input side of the SSR and it stays latched in the ON
state
> > with the LED on. Does anyone know how to get it to turn off when
it
> > is supposed to?
>
> What happens when you pull the input to ground after it has been
> turned on ?
>
> It may be as simple as a a pulldown resistor on the line ?
>
> Also, check the data sheets for the device carefully.
>
> SSR's often have a minimum load to operate. Although 340mA is
alot
> for a Stamp, is it not a lot for a relay.
>
> Seems one TIP120 could handle the whole lot with ease.
>
> Dave
The relay stays in the ON state even if the input is pulled to
ground. Resetting the circuit or pulling the power on the LED are
the only ways to reset the relay. With the LED out of the circuit
and putting a meter in its place, I notice that the relay latches
and unlatches correctly. Also, this is just a test rig at the moment
and there will be 12 relays on 12 output lines from the stamp with
two of these LEDs on each relay pulling a total of 640mA. The meter
thing really puzzles me though.
Chuck
What you are describing is what would happen if an SSR made for an ac
load where connected to a dc load.
You could turn on the load with the input to the ssr but could only turn
it off by disconnecting power to the load.
Fred
Original Message
From: chuckdrew [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=4WwIzhCTI8ceLY_bRciQQRCOUvERngSWW3zsK1HwAWoQPu7cfi2r-VyzD_vYY6vtTB_8Z4Iw3uE6EePw_ro]chuckdrew@y...[/url
Sent: Wednesday, February 18, 2004 6:36 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] solid state relays
Here's a question for you guys. I've got a BS2p40 that will have 12
push buttons as inputs and a series of high current (340mA) LED's
attached on output pins connected through solid state relays. Problem
is is that in my mock-up I'm using a regular LED on the output of the
SSR and when triggered by a switch, turns on, but does not turn back
off after the puase is over unless power is manually removed from the
LED. The SSR stays latched in the on state even though the trigger
voltage is switched back to a low state. I can even remove the wires
to the input side of the SSR and it stays latched in the ON state
with the LED on. Does anyone know how to get it to turn off when it
is supposed to?
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject
and Body of the message will be ignored.
Yahoo! Groups Links
Original Message
From: chuckdrew <chuckdrew@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, February 19, 2004 8:46 AM
Subject: [noparse][[/noparse]basicstamps] Re: solid state relays
> --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
> wrote:
> > --- In basicstamps@yahoogroups.com, "chuckdrew" <chuckdrew@y...>
> > wrote:
> > > Here's a question for you guys. I've got a BS2p40 that will have
> 12
> > > push buttons as inputs and a series of high current (340mA)
> LED's
> > > attached on output pins connected through solid state relays.
> > Problem
> > > is is that in my mock-up I'm using a regular LED on the output
> of
> > the
> > > SSR and when triggered by a switch, turns on, but does not turn
> > back
> > > off after the puase is over unless power is manually removed
> from
> > the
> > > LED. The SSR stays latched in the on state even though the
> trigger
> > > voltage is switched back to a low state. I can even remove the
> > wires
> > > to the input side of the SSR and it stays latched in the ON
> state
> > > with the LED on. Does anyone know how to get it to turn off when
> it
> > > is supposed to?
> >
> > What happens when you pull the input to ground after it has been
> > turned on ?
> >
> > It may be as simple as a a pulldown resistor on the line ?
> >
> > Also, check the data sheets for the device carefully.
> >
> > SSR's often have a minimum load to operate. Although 340mA is
> alot
> > for a Stamp, is it not a lot for a relay.
> >
> > Seems one TIP120 could handle the whole lot with ease.
> >
> > Dave
>
>
> The relay stays in the ON state even if the input is pulled to
> ground. Resetting the circuit or pulling the power on the LED are
> the only ways to reset the relay. With the LED out of the circuit
> and putting a meter in its place, I notice that the relay latches
> and unlatches correctly. Also, this is just a test rig at the moment
> and there will be 12 relays on 12 output lines from the stamp with
> two of these LEDs on each relay pulling a total of 640mA. The meter
> thing really puzzles me though.
>
> Chuck
> when removing the led you have placed a voltmeter in series in the circuit
and a volt meter is designed to be used in paralell
so i belive any type reading could occur
max
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
all for DC voltages. Some solid state relays are made to switch DC so they
use different internal circuitry.
jim
http://www.geocities.com/jimforkin2003/
Original Message
From: max powell [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Zs7apGYre0-vhvCKQH9cuKgEg0ria-KEt92slshGLsCHiVnn3uR-CuU2izgxpTghjJpgHkVdZkM]mpowell@t...[/url
Sent: Thursday, February 19, 2004 11:17 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Re: solid state relays
Original Message
From: chuckdrew <chuckdrew@y...>
To: <basicstamps@yahoogroups.com>
Sent: Thursday, February 19, 2004 8:46 AM
Subject: [noparse][[/noparse]basicstamps] Re: solid state relays
> --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
> wrote:
> > --- In basicstamps@yahoogroups.com, "chuckdrew" <chuckdrew@y...>
> > wrote:
> > > Here's a question for you guys. I've got a BS2p40 that will have
> 12
> > > push buttons as inputs and a series of high current (340mA)
> LED's
> > > attached on output pins connected through solid state relays.
> > Problem
> > > is is that in my mock-up I'm using a regular LED on the output
> of
> > the
> > > SSR and when triggered by a switch, turns on, but does not turn
> > back
> > > off after the puase is over unless power is manually removed
> from
> > the
> > > LED. The SSR stays latched in the on state even though the
> trigger
> > > voltage is switched back to a low state. I can even remove the
> > wires
> > > to the input side of the SSR and it stays latched in the ON
> state
> > > with the LED on. Does anyone know how to get it to turn off when
> it
> > > is supposed to?
> >
> > What happens when you pull the input to ground after it has been
> > turned on ?
> >
> > It may be as simple as a a pulldown resistor on the line ?
> >
> > Also, check the data sheets for the device carefully.
> >
> > SSR's often have a minimum load to operate. Although 340mA is
> alot
> > for a Stamp, is it not a lot for a relay.
> >
> > Seems one TIP120 could handle the whole lot with ease.
> >
> > Dave
>
>
> The relay stays in the ON state even if the input is pulled to
> ground. Resetting the circuit or pulling the power on the LED are
> the only ways to reset the relay. With the LED out of the circuit
> and putting a meter in its place, I notice that the relay latches
> and unlatches correctly. Also, this is just a test rig at the moment
> and there will be 12 relays on 12 output lines from the stamp with
> two of these LEDs on each relay pulling a total of 640mA. The meter
> thing really puzzles me though.
>
> Chuck
> when removing the led you have placed a voltmeter in series in the circuit
and a volt meter is designed to be used in paralell
so i belive any type reading could occur
max
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Yahoo! Groups Links
chosen the wrong type of SSR. I thought I purchsed DC SSRs.
Chuck
--- In basicstamps@yahoogroups.com, "Jim Forkin" <jjf@p...> wrote:
> Many solid state relays are for switching AC and may latch up or
not work at
> all for DC voltages. Some solid state relays are made to switch DC
so they
> use different internal circuitry.
> jim
> http://www.geocities.com/jimforkin2003/
>
>
>
Original Message
> From: max powell [noparse][[/noparse]mailto:mpowell@t...]
> Sent: Thursday, February 19, 2004 11:17 AM
> To: basicstamps@yahoogroups.com
> Subject: Re: [noparse][[/noparse]basicstamps] Re: solid state relays
>
>
>
>
Original Message
> From: chuckdrew <chuckdrew@y...>
> To: <basicstamps@yahoogroups.com>
> Sent: Thursday, February 19, 2004 8:46 AM
> Subject: [noparse][[/noparse]basicstamps] Re: solid state relays
>
>
> > --- In basicstamps@yahoogroups.com, "Dave Mucha" <davemucha@j...>
> > wrote:
> > > --- In basicstamps@yahoogroups.com, "chuckdrew" <chuckdrew@y...>
> > > wrote:
> > > > Here's a question for you guys. I've got a BS2p40 that will
have
> > 12
> > > > push buttons as inputs and a series of high current (340mA)
> > LED's
> > > > attached on output pins connected through solid state relays.
> > > Problem
> > > > is is that in my mock-up I'm using a regular LED on the output
> > of
> > > the
> > > > SSR and when triggered by a switch, turns on, but does not
turn
> > > back
> > > > off after the puase is over unless power is manually removed
> > from
> > > the
> > > > LED. The SSR stays latched in the on state even though the
> > trigger
> > > > voltage is switched back to a low state. I can even remove the
> > > wires
> > > > to the input side of the SSR and it stays latched in the ON
> > state
> > > > with the LED on. Does anyone know how to get it to turn off
when
> > it
> > > > is supposed to?
> > >
> > > What happens when you pull the input to ground after it has been
> > > turned on ?
> > >
> > > It may be as simple as a a pulldown resistor on the line ?
> > >
> > > Also, check the data sheets for the device carefully.
> > >
> > > SSR's often have a minimum load to operate. Although 340mA is
> > alot
> > > for a Stamp, is it not a lot for a relay.
> > >
> > > Seems one TIP120 could handle the whole lot with ease.
> > >
> > > Dave
> >
> >
> > The relay stays in the ON state even if the input is pulled to
> > ground. Resetting the circuit or pulling the power on the LED are
> > the only ways to reset the relay. With the LED out of the circuit
> > and putting a meter in its place, I notice that the relay latches
> > and unlatches correctly. Also, this is just a test rig at the
moment
> > and there will be 12 relays on 12 output lines from the stamp with
> > two of these LEDs on each relay pulling a total of 640mA. The
meter
> > thing really puzzles me though.
> >
> > Chuck
> > when removing the led you have placed a voltmeter in series in
the circuit
> and a volt meter is designed to be used in paralell
> so i belive any type reading could occur
> max
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@yahoogroups.com
> > from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
Subject and
> Body of the message will be ignored.
>
> Yahoo! Groups Links