[TRNSYS-users] problem about the differential controller (Type2)

[Graham Morrison]

Yin

See
http://users.tpg.com.au/t_design/PCL_Design/PCL_Design.htm

Graham Morrison


At 01:07 AM 16/09/2009, Yin Hang wrote:
>--===============0736645340==
>Content-Language: en-us
>
>Hello,
>Thanks for your replying.
>I have connected connect the output of the controller to its
>"input control function" (input 4).
>But if you look at the example in TRNSYS - "DHSW", you will
>also find this fluctuation problem.(suddenly on and suddenly
>off, even still in the deadband).
>Thanks.
>Yin
>
>-----Original Message-----
>From: Francois Badinier
>[mailto:francois.badinier at icax.co.uk]
>Sent: Tuesday, September 15, 2009 5:11 AM
>To: 'Yin Hang'; trnsys-users at cae.wisc.edu
>Subject: RE: [TRNSYS-users] problem about the differential
>controller (Type2)
>
>Yin,
>
>Make sure you connect the output of the controller to its
>"input control function" (input 4). You link the controller
>with itself basically. This has to be done in order to get
>the hysteresis effect working (influence of the previous
>state).
>With that done, it should work properly.
>
>Regards,
>
>François Badinier
>Development Engineer
>ICAX Ltd
>1 Hatfield House
>Baltic Street West
>London EC1Y OST
>francois.badinier at icax.co.uk
>www.icax.co.uk
>
>
>
>
>-----Original Message-----
>From: Yin Hang [mailto:yhang at purdue.edu]
>Sent: 14 September 2009 19:47
>To: trnsys-users at cae.wisc.edu
>Subject: [TRNSYS-users] problem about the differential
>controller (Type2)
>
>Hello,
>I have a problem when I use differential controller type2.
>For example, I want to control my solar collector loop pump
>by using one of this controller.
>My control logic is when the outlet temperature of my solar
>collector is higher than the inlet temperature of my solar
>collector 4C, the pump will be on;
>And when it is lower than the inlet temperature for 2C, the
>pump will be off.
>However, I found the output control signal is fluctuated,
>such as it suddenly becomes off even the outlet temperature
>is 2C higher than the outlet temperature; and next timestep,
>it suddenly on.
>Could you help me to fix this problem? I figure it is really
>bad since it is un-normal for my pump during true situation.
>Thanks.
>
>
>
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Graham Morrison

Emeritus Professor of Mechanical Engineering
School of Mechanical & Manufacturing Engineering
The University of New South Wales
Sydney Australia 2052

Phone  +61 (0) 2 9385 4127
Mobile  +61 (0) 425 212 218
Fax      +61 (0) 2 9663 1222

g.morrison at unsw.edu.au

Web sites

<http://www.mech.unsw.edu.au/content/staff/morrison.cfm?ss=4>G.<http://www.mech.unsw.edu.au/content/labs_computing/Solar_Thermal.cfm?ss=5>Morrison

Solar Thermal Energy Laboratory at 
<http://www.mech.unsw.edu.au/content/labs_computing/Solar_Thermal.cfm?ss=5>UNSW

<http://solar1.mech.unsw.edu.au/>Solar thermal technology

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