Re: [EnergyPlus_Support] FindRootSimpleController: Controller error

[Fred Buhl <wfbuhl@xxxxxxx>]

 From the warning message, it appears that the setpoint temperature is 
11.89, not 24 as
you wish. And the chilled water entering the coil is at 24.81 C, too 
warm to do any cooling.
Probably the chiller is off. Is there some other SetpointManager setting 
the setpoint?

Fred Buhl

On 5/7/2010 8:36 AM, eplusven wrote:
> Hi all,
>
> Could you please help how do i resolve this. Actually i wanted to model AHU air supply always 24C, becasue my Fancoil units will further does cooling or heating. For this reason I set the controller as 
>
> SetpointManager:OutdoorAirReset,
>     Supply Air Temp Manager 1,  !- Name
>     Temperature,             !- Control Variable
>     24,                      !- Setpoint at Outdoor Low Temperature {C}
>     -9,                       !- Outdoor Low Temperature {C}
>     24,                      !- Setpoint at Outdoor High Temperature {C}
>     35,                      !- Outdoor High Temperature {C}
>     Supply Air Temp Nodes 1; !- Setpoint Node or NodeList Name
> This si giving problem only for one month i.e May. But rest of teh months the simulation going well with lot of warnings
>
>
>    ** Severe  ** FindRootSimpleController: Controller error for controller = CENTRAL COOLING COIL CONTROLLER 1
>    **   ~~~   **  Occurrence info=MonSIM, 05/02 06:15 - 06:30
>    **   ~~~   **   Controller function is inconsistent with user specified controller action = Reverse action
>    **   ~~~   **   Actuator will be set to maximum action
>    **   ~~~   ** Controller control type=Temperature
>    **   ~~~   ** Controller temperature set point = 11.89 [C]
>    **   ~~~   ** Controller sensed temperature = 23.56 [C]
>    **   ~~~   ** Controller actuator mass flow rate set to 116.44 [kg/s]
>    **   ~~~   ** Controller actuator temperature = 24.81 [C]
>    **   ~~~   **   Note: Chilled water coils should be reverse action and the entering chilled
>    **   ~~~   **         water temperature (controller actuator temperature) should be below the setpoint temperature
>
>
>
> Thanks
> -Ven
>
>
>
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