help for a ventilation control.

[jolatouffe]

Hi all,

Sorry for my poor English, I'm French.

In fact I have a little trouble at work.
I have to do a little ventilation control.
Material : Eaton Easy822-DC-TC module an EASY_DC_ME.  2    PT100   temperature probe.

In fact I have a room to be ventilated. Ventilation must engage in the room when it is >24°C, otherwise the fan is off.
If the outdoor temperature is <20°C the air is forced inside the room, and if the outdoor temperature is >20°C the air is extracted from the room.

Can you help me with the programming because I have a lot of shortcomings, and I have already spent a long time for no result...

Thank you in advance.

Jo

[radar17892]

Hi Jo

You can`t connect directly PT100 sensors on Easy822. Use PT100/0-10V converter (for example http://www.conrad.de/ce/de/product/197528/Enda-MU-PT100-U010-50100-Temperatur-Messumformer-fuer-Pt-100 )
Attached please find a small sample.

regards Thomas

[jolatouffe]

Hi Thomas

Rectification,

Material : Eaton Easy822-DC-TC module and EASY406_DC_ME.  2    PT100   temperature probe.

More one question...

I have work with MW as memory in my program, but when the power shut down, or Start/Stop, everything stored in MW's case are erase.
What can I do?

Thank's

Jo

[jolatouffe]

Hi Thomas,
Thank you for your example.
In attachment I put the program I have made.
I thought I could do it like that, with the easy406-DC-ME.
I look the value of sensors that come in MW, and I work with the values for making comparisons.
The problem is that I can not save the MW, the disappear all th time.

Thank you for taking time to help me, it is very nice.

Jo

[Spellbreaker]

Hey there,

you can either set the remanency of MB in the System Settings of your Project, ( To Save MW18 for example, which cointains a 2 Byte Value, you have to save MB 35-36), or you can store the values in one or more DBs and set the Remanency of DB in your System Settings.

Cheers,

Spellbreaker

[jolatouffe]

Hi Spellbreaker,

I don't understand how I have to do.
In my program I have the values :
MW10= 231
MW30= 285

How can I convert this in MB?

Thanks for the answer

Jo

[radar17892]

Hi Jo

MW10 includes MB19+20. Have a look on Juergen`s MB/MW table http://easy-forum.net/index.php?action=dlattach;topic=1150.0;attach=450
Please read easy800 manual, chapter 4.4 to.

regards Thomas

[jolatouffe]

Hi Thomas and Spellbreaker,

Thank you very much for your time and your help.

My program is ok and my regulation work.

Jo