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

[Graham Morrison <g.morrison@unsw.edu.au>]

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@icax.co.uk]
> Sent: Tuesday, September 15, 2009 5:11 AM
> To: 'Yin Hang'; trnsys-users@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@icax.co.uk
> www.icax.co.uk
>
>
>
>
> -----Original Message-----
> From: Yin Hang
> [
> mailto:yhang@purdue.edu]
> Sent: 14 September 2009 19:47
> To: trnsys-users@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@unsw.edu.au

Web sites

G. Morrison

Solar Thermal Energy Laboratory at UNSW

Solar thermal technology