high current dimmers
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I am trying to control 8 large PAR 57 lamps using the BS2. THese are
really large 120 V, 300 W lamps. Are there IC's or some dimmer packs
that accept TTL signals from the BS2?
Thanks
really large 120 V, 300 W lamps. Are there IC's or some dimmer packs
that accept TTL signals from the BS2?
Thanks
Comments
lamps. You need to isolate the BS-2 from the 120 volt lines by using an
optoisolator (like a MOC3011). Connect this to a Q400L4 Triac to switch the
load of the lamp. Some optoisolators even provide zero crossing detection so
that the load is only switched on when the voltage is at or near zero. This
greatly extends the life of the triacs & reduces EMF.
Dennie Bishop
www.electronicmediasystems.com
Original Message
From: brownstamp@y... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=VYf4BKfj5zsnlmiiR80GLqoeIw5QtlVhTTsVSsvlgwjL1iCwkyV7BjTq52HY8ihxW9FuqdB3_blqxPw-TnE]brownstamp@y...[/url
Sent: Saturday, November 03, 2001 6:21 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] high current dimmers
I am trying to control 8 large PAR 57 lamps using the BS2. THese are
really large 120 V, 300 W lamps. Are there IC's or some dimmer packs
that accept TTL signals from the BS2?
Thanks
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how to control the brightness of the lampwith reasonable resolution.
I did some "digging" on the net for dimmer packs that accept RS232
but came out negative.
--- In basicstamps@y..., "Electronic Media Systems" <dbishop@e...>
wrote:
> This is the basis of most large electronic signs that use
incandescent
> lamps. You need to isolate the BS-2 from the 120 volt lines by
using an
> optoisolator (like a MOC3011). Connect this to a Q400L4 Triac to
switch the
> load of the lamp. Some optoisolators even provide zero crossing
detection so
> that the load is only switched on when the voltage is at or near
zero. This
> greatly extends the life of the triacs & reduces EMF.
>
> Dennie Bishop
> www.electronicmediasystems.com
>
>
>
>
Original Message
> From: brownstamp@y... [noparse][[/noparse]mailto:brownstamp@y...]
> Sent: Saturday, November 03, 2001 6:21 PM
> To: basicstamps@y...
> Subject: [noparse][[/noparse]basicstamps] high current dimmers
>
>
> I am trying to control 8 large PAR 57 lamps using the BS2. THese
are
> really large 120 V, 300 W lamps. Are there IC's or some dimmer
packs
> that accept TTL signals from the BS2?
>
>
> Thanks
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@y...
> 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/
If you are able to program a PIC I have designed a dimmer that takes RS232
and fires a triac thru an optocoupler at the correct phase angle. You will
need one for each channel you want to dim.
Another option would be a DMX512 dimmerpack and perhaps a RS232 to DMX512
converter, if such a thing exists.
Contact me of list since this is not a direct Stamp project, if you are
interested.
By the way, whats your name?
/Henrik Olsson. Sweden.
Original Message
From: <brownstamp@y...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, November 04, 2001 2:11 PM
Subject: [noparse][[/noparse]basicstamps] Re: high current dimmers
> Thank you! However, switching is easy and what I need to know is
> how to control the brightness of the lampwith reasonable resolution.
>
> I did some "digging" on the net for dimmer packs that accept RS232
> but came out negative.
>
> --- In basicstamps@y..., "Electronic Media Systems" <dbishop@e...>
> wrote:
> > This is the basis of most large electronic signs that use
> incandescent
> > lamps. You need to isolate the BS-2 from the 120 volt lines by
> using an
> > optoisolator (like a MOC3011). Connect this to a Q400L4 Triac to
> switch the
> > load of the lamp. Some optoisolators even provide zero crossing
> detection so
> > that the load is only switched on when the voltage is at or near
> zero. This
> > greatly extends the life of the triacs & reduces EMF.
> >
> > Dennie Bishop
> > www.electronicmediasystems.com
> >
> >
> >
> >
Original Message
> > From: brownstamp@y... [noparse][[/noparse]mailto:brownstamp@y...]
> > Sent: Saturday, November 03, 2001 6:21 PM
> > To: basicstamps@y...
> > Subject: [noparse][[/noparse]basicstamps] high current dimmers
> >
> >
> > I am trying to control 8 large PAR 57 lamps using the BS2. THese
> are
> > really large 120 V, 300 W lamps. Are there IC's or some dimmer
> packs
> > that accept TTL signals from the BS2?
> >
> >
> > Thanks
> >
> >
> > To UNSUBSCRIBE, just send mail to:
> > basicstamps-unsubscribe@y...
> > 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/
>
>
> 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/
>
>
henrik-olsson@t...
/Henrik Olsson. Sweden
Original Message
> Hi,
> If you are able to program a PIC I have designed a dimmer that takes RS232
> and fires a triac thru an optocoupler at the correct phase angle. You will
> need one for each channel you want to dim.
> Another option would be a DMX512 dimmerpack and perhaps a RS232 to DMX512
> converter, if such a thing exists.
> Contact me of list since this is not a direct Stamp project, if you are
> interested.
> By the way, whats your name?
>
> /Henrik Olsson. Sweden.
Zero-crossing detection is required, yet the isolation to fire the triac or
SCR gates must not be zero-crossing types if phase-angle dimming is to be
accomplished.
Proportional switching at zero-crossings is used for controlling heater
loads, but lamp filaments will flicker and have their lives severely
shortened if this control method is used on them.
also.
MOC 3010's and 3011's will fail on AC line voltage if given any serious use.
They are a good place to start, however, because of their low-cost.
A quality phase-angle design will take the line noise into consideration in
a number of ways. The EU seems to be bugged a bit about this kind of EMF,
but these are used continually in the US without problems. Many such
products have been self-certified according to CE regs anyway. Cross-talk is
perhaps the most serious consideration, and any design that doesn't have
this covered will be a problem anywhere.
Triacs are good for light-duty and home-ware because the pair of thryristors
inside share a common gate connection. SCR's are preferred for industrial
use for this and other reasons.
Chris
> This is the basis of most large electronic signs that use incandescent
> lamps. You need to isolate the BS-2 from the 120 volt lines
> by using an
> optoisolator (like a MOC3011). Connect this to a Q400L4 Triac
> to switch the
> load of the lamp. Some optoisolators even provide zero
> crossing detection so
> that the load is only switched on when the voltage is at or
> near zero. This
> greatly extends the life of the triacs & reduces EMF.
>
> Dennie Bishop
> www.electronicmediasystems.com
>
>
Original Message
> From: Chris Loiacono [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=vFj3tGSQShf705IM2cAphmEvXbRy_4IWwr2lftvIu7YKdKqFg9RnnQyyTaA2KXx4g_elgDuGPqML3Qg]chris@m...[/url
> Sent: Sunday, November 04, 2001 3:34 PM
> To: 'basicstamps@yahoogroups.com'
> Subject: RE: [noparse][[/noparse]basicstamps] high current dimmers
>
>
> I am beta testing two new boards based on PIC18's that are
> just for this purpose. They will accept standard serout
> instructions from a Stamp to provide 8 bit resolution of
> phase angle control of resistive loads (which includes lamp
> dimming) from zero to 100% of the load current via an
> algorithm that is truly linear. They are made to fire any
> number of SCR types and sizes and are available in 115V,
> 208-240 single-phase and one version for three-phase up to
> 480V. You can use your own SCR's or I can provide them. The
> SCR's are not on-board because one design goal was to be able
> to control from 100W up to hundreds of Amps with the same
> controller. Along with Pbasic serout compatibility inputs are
> also included for 0-5V, 0-10V 0-20 mA & 4-20mA.
>
> There is a connector for optional LCD display of status which
> includes power level and dynamic current tracking and
> reporting, i.e.: whether or not the load (in this case, lamp
> filaments) have changed resistance or burned open as well as
> fuse opening. This week I am working on adding a static
> current limit feature also.
> These controller boards have opto-isolated connections to the
> AC line and fast transient protection.
>
> The single phase version accepts input through a three-pin
> header directly from a Stamp. The on-board 1A power-supply
> +5v & Gnd are suitable for powering the Stamp, or other
> auxiliary devices through the same header.
> This is a near-instrument grade device, but it's a low-cost
> commercial product.
> They have been performing without glitches.
>
> If you contact me off list, I will send a small pdf spec
> sheet for the single phase version and discuss this with you further.
>
> Chris Loiacono
>
>
> >
Original Message
> > From: brownstamp@y... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=6QZcIdo2w6N81oovfAiWD2nFqNRvFbP6YU6hUbJT-6-6HSf3YHo8Pbz71qSXo3v3tSzEGtcZ1z6Cu-o3D9E]brownstamp@y...[/url
> > Sent: Saturday, November 03, 2001 6:21 PM
> > To: basicstamps@yahoogroups.com
> > Subject: [noparse][[/noparse]basicstamps] high current dimmers
> >
> >
> > I am trying to control 8 large PAR 57 lamps using the BS2.
> THese are
> > really large 120 V, 300 W lamps. Are there IC's or some
> dimmer packs
> > that accept TTL signals from the BS2?
> >
> >
> > Thanks
> >
> >
> > 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/
> >
> >
>
Read your post to the stamp group with interest. I would like to phase
control the primary of a three phase transformer. Have any experience
with this sort of thing. For example what kind of snubber networks
would I use? How would I rate the triacs? The x-former is about a 5KVA
unit. What I world like to do is take the pulse stream from a single
phase source that is occurring at 60 Hz and send the first pulse to one
leg, the next cycle to the send leg, the next to the third leg and then
repeat. Just a idea that interests me. BTW the logic of doing this I
know how to do. WHat I am curious about is the practicals of teh power
and control scheme.
kind regards,
Leroy Hall
Olsson wrote:
>
> Hi,
> If you are able to program a PIC I have designed a dimmer that takes RS232
> and fires a triac thru an optocoupler at the correct phase angle. You will
> need one for each channel you want to dim.
> Another option would be a DMX512 dimmerpack and perhaps a RS232 to DMX512
> converter, if such a thing exists.
> Contact me of list since this is not a direct Stamp project, if you are
> interested.
> By the way, whats your name?
>
group. Ya gotta love netscape.
leroy
Leroy Hall wrote:
>
> Dear Henrik,
>
> Read your post to the stamp group with interest. I would like to phase
> control the primary of a three phase transformer. Have any experience
> with this sort of thing. For example what kind of snubber networks
> would I use? How would I rate the triacs? The x-former is about a 5KVA
> unit. What I world like to do is take the pulse stream from a single
> phase source that is occurring at 60 Hz and send the first pulse to one
> leg, the next cycle to the send leg, the next to the third leg and then
> repeat. Just a idea that interests me. BTW the logic of doing this I
> know how to do. WHat I am curious about is the practicals of teh power
> and control scheme.
>
> kind regards,
>
> Leroy Hall
>
> Olsson wrote:
> >
> > Hi,
> > If you are able to program a PIC I have designed a dimmer that takes RS232
> > and fires a triac thru an optocoupler at the correct phase angle. You will
> > need one for each channel you want to dim.
> > Another option would be a DMX512 dimmerpack and perhaps a RS232 to DMX512
> > converter, if such a thing exists.
> > Contact me of list since this is not a direct Stamp project, if you are
> > interested.
> > By the way, whats your name?
> >
>
> 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/
home automation units . Theres a program for them in my parallax BS2
manual.
On Sat, 03 Nov 2001 23:20:44 -0000 brownstamp@y... writes:
> I am trying to control 8 large PAR 57 lamps using the BS2. THese are
>
> really large 120 V, 300 W lamps. Are there IC's or some dimmer
> packs
> that accept TTL signals from the BS2?
>
>
> Thanks
>
>
> 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/
>
>
smarthome.com POWERLINC X10 INTERFACE WITH 12 VDC OUTPUT #1132 AND
1132P PROGRAMMERS GUIDE, AND 1132S RS232 SERIAL PORT CONNECTOR .
ALSO SOME SOFTWARE FOR THIS DEVICE FREE ON THEIR WEB SITE.
VISUAL BASIC PROGRAMS IN THE DOWNLOAD PACKAGE.
YOU CAN CONTROL ANY X10 DEVICE THRU THIS POWERLINC 10 MODULE WITH
PROPER SOFTWARE. AND YOU CAN READ AND WRITE BIDIRECTIONALY WITH 2 OF
THE DEVICES. ACCORDING TO THE DOCS RUNS AT 9600. ALSO YOU CAN USE IT
AS A COMMUNICATION LINK OVER THE POWER LINE. OPENS UP A LOT OF NEW
DOORS FOR X10 DEVICES AND STAMPS.
73 SPENCE
I'm sorry to tell you that I have no experience in controlling inductive
loads with triacs or SCR's. I belive it can be pretty complicated because of
the current and voltage being out of phase. Perhaps you could use an of the
shelf VFD but I'm not sure how the transformer will behave due to the high
frequency PWM'd sinus-style output from the VFD.
Also, I belive all power-transformer is manufactured for 50 or 60 hz and if
you go lower than that the core will be saturated and the transformer will
most likely burn up. What happends when you increase the frequency I don't
know.
Sorry that I can't be of any more assistance to you than this. If you think
I can help you with anything just ask. I'll be glad to help if I can.
Henrik Olsson. Sweden.
Original Message
From: "Leroy Hall" <leroy@f...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, November 04, 2001 11:59 PM
Subject: [noparse][[/noparse]basicstamps] high current dimmers
> Dear Henrik,
>
> Read your post to the stamp group with interest. I would like to phase
> control the primary of a three phase transformer. Have any experience
> with this sort of thing. For example what kind of snubber networks
> would I use? How would I rate the triacs? The x-former is about a 5KVA
> unit. What I world like to do is take the pulse stream from a single
> phase source that is occurring at 60 Hz and send the first pulse to one
> leg, the next cycle to the send leg, the next to the third leg and then
> repeat. Just a idea that interests me. BTW the logic of doing this I
> know how to do. WHat I am curious about is the practicals of teh power
> and control scheme.
>
>
> kind regards,
>
> Leroy Hall