[TRNSYS-users] modelling a differential controller for pump

[Hasan baig]

Hi,

I wish to model a real differential controller for my variable speed
pump. The controller works as a standard differential controller. If the
switch-on difference is reached, the pump is activated. When the
temperature difference falls below the adjusted switch-off temperature
difference, the respective relay switches off. When the switch-on
temperature difference is reached, the pump is activated at full speed for
10 seconds. Then, the speed is reduced to the minimum pump speed value
(factory setting = 30 %). If the temperature difference reaches the
adjusted nominal temperature difference, the pump speed increases by
one step (10 %). If the difference increases by the adjustable rise value,
the pump speed increases by 10 % respectively until the maximum pump speed
of 100 % is reached.

Any suggestions on how to model this pump in TRNSYS ?

regards

Hasan
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