Well its a radio station? Or a sound amp?
Em quinta-feira, 2 de outubro de 2014, Jerry Scharf <
sch...@lagunawayconsulting.com> escreveu:
> Hi,
>
> Thanks for all the input. I am guessing my experience with slow reads is
> due to the long buses I have with my current setup.
>
> The bus will be very short because all the load resistors are on a rack
> with water cooled heat sinks. I can make the main power and ground lines
> any gauge I want, and the data line will be <20 feet. A couple amps is
> easy to push around. The completed system will be sucking over 20kW of
> power and dumping it into the load resistors.
>
> As for temperature change, when you dump 65W into a resistor that is has
> a surface area of about 15mm square, the heat can change pretty quickly.
> I was hoping to poll all the sensors at least every 30 seconds. I need
> to measure both the resistors that exceed a threshold and the difference
> between the coldest and hottest part. I expect the parts to be running
> at 90-110C, so I will be able to use almost the full range of the chip.
> There will be relays that can cut the power to any resistor that starts
> to run away, so I just need to catch it in time. (carbon resistors
> resistance drops with increased temperature, so as they start to get
> hot, the resistance drops and the power through it goes up...)
>
> I am looking at using the Z version (SO) mounted to a board and the load
> resistors bent over backwards. The board will have a hole that allows a
> bolt to go through and bolt the board, 18b20 and TO247 load resistor to
> the aluminum extrusion with two pipes of cooling water built in. This
> will give a relatively accurate measure of the resistor temperature.
>
> Trying to handle over 300 thermocouples becomes a real chore. The only
> risk I see is that we start having the load resistors getting well past
> 125C and cooking the 18b20s.
>
> I promise to send pictures when we are done.
>
> jerry
>
> On 10/01/2014 03:52 PM, Roberto Spadim wrote:
> > if it's not to control a process, i think could use without problems,
> > like paul told, temperature don't change too fast, only if you are
> > controlling something, in this case should check system update rate
> > using modbus devices i got ~20ms to read 8 termocouples with rs485
> > (serial) 9600bauds
> > i think it's a good number to think about, 60~50Hz update rate is very
> > good to control systems using temperature termocouples
> >
> > 2014-10-01 19:01 GMT-03:00 Paul Alfille <paul.alfi...@gmail.com
> <javascript:;>>:
> >> I've done over 100 DS18S20's (passive) on passive, active, Link and
> DS9490
> >> successfully. It isn't fast, but then your temperature changes aren't
> that
> >> fast.
> >>
> >> On Wed, Oct 1, 2014 at 4:53 PM, Roberto Spadim <robe...@spadim.com.br
> <javascript:;>>
> >> wrote:
> >>> that what i stored here some years ago when testing ds1820 devices
> >>> in other words 300*.01 = 3 seconds
> >>> maybe less maybe more
> >>>
> >>> what update period you need?
> >>>
> >>>
> >>>
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--
Roberto Spadim
SPAEmpresarial
Eng. Automação e Controle
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