Re: [TRNSYS-users] Integrator negative vlaue

["Jeff Thornton" <thornton@tess-inc.com>]

<I tried doing that by subtracting the value of the integrator from itself, but as mentioned above, it doesnt seem to work.>

Well to reset the integrator you would have to subtract the current value of the integrator DIVIDED BY THE TIMESTEP to effectively zero the integrator.  Remember it's adding Input*Timestep to the total each time.

Jeff




Jeff Thornton 
President - TESS, LLC 

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----- Original Message -----
From: fgammoh@stud.fh-offenburg.de
Sent: Wed, September 23, 2009, 7:18 AM
Subject: [TRNSYS-users] Integrator negative vlaue

Hello,
What happens when you feed in a negative value into an integrator?
I would like to subtract something rather than add, but an itegrator doesnt seem to do that. Once i feed in a negative value, It doesnt integrate anymore, the value remains the same.

Or if that doesnt work, I would like to reset the itegrator under certain conditions. Meaning, when the integrator recieves a value of 0, it is reset to zero too.
I tried doing that by subtracting the value of the integrator from itself, but as mentioned above, it doesnt seem to work.

Thanks,
Farah


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