[TRNSYS-users] Type 122 -Feedback Controller

[Thibaut VITTE]

Dear Trnsys Users,

I'm using a feedback controller to control the pump (variable speed) of 
the heating loop of a pool.
My timestep is 1 hour, my tolerance on the pool's temperature is 0.25°C 
and evrtyhing works fine.
When I try to reduce the timestep to have a more accurate regulation, 
the controller stops to works fine. It oscillates a lot (actually all 
the time) and doesn't go down to zero. The result is that my water 
temperature is greater than the setpoint.
I cannot understantd this behaviour. Is there anything to know for 
timesteps with respect to feedback controller?

Thanks in advance.