Minimum Control Value For Basic Load > 0; Basic Load Active When Controller Off; Send Inactive Control Values Cyclically - ABB i-bus FCC/S 1 1 Series Product Manual

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ABB i-bus KNX
Parameters
7.5.1.1 Minimum control value for basic load > 0
Options:
This parameter is used to specify whether the basic load for the individual heating and cooling
stages is to be always active or whether it is to be possible to activate or deactivate it via a group
object.
• Activate via object: On the selection of this option, the Min. control value (basic load) function
can be activated (1) or deactivated (0) via the Activate minimum control value (basic load)
group object. If it is activated, then the heating medium is always pumped through the system
with at least the minimum control value. If it is deactivated, the control value can be reduced to
zero by the controller.
The dependent Activate minimum control value (basic load) group object is enabled.
• Always active: On the selection of this option, the basic load is always active
The settings for the basic load can be specified independently for each stage. This setting is
specified in the Temperature controller - Basic-stage heating, Temperature controller - Additional-
stage heating, Temperature controller - Basic-stage cooling, Temperature controller - Additional-
stage cooling parameter window. Here the minimum control value for the basic load that is not al-
lowed to be dropped below is specified.
This value can only be specified for the PI control types.
The basic load is always activated for all stages, but only applies to the currently active heating or
cooling operating mode.
A possible application for the basic load is, e.g., floor heating in which a specific control value
must not be dropped below to protect the installation.
7.5.1.2

Basic load active when controller off

Options:
This parameter is used to specify whether the basic load is to be active if the controller has been
switched off via the Request On/Off (master) group object.
• No: The basic load is also switched off if the controller is switched off.
• Yes: The basic load remains active even if the controller is switched off.
7.5.1.3

Send inactive control values cyclically

This parameter is enabled if the controller has been parameterized both for heating and for cool-
ing. For this purpose, the Deactivated option must not be selected for the two parameters Basic-
stage heating and Basic-stage cooling in the Application parameters parameter window.
Options:
The parameter is used to influence the behavior on sending the controller control value output.
This parameter can be used to specify whether the control values for the operating mode not cur-
rently active (heating or cooling) are to be sent or not.
This setting is necessary for systems that have only one control value input for heating and cool-
ing. In this situation, both output objects for the control value (Status Control value Basic-stage
heating and Status Control value Basic-stage cooling) must be linked to the same input object.
The cyclic sending of both control values in this situation means that the active and inactive value
continuously overwrite each other. To prevent this action from arising, the cyclic sending of the in-
active control value can be inhibited.
Activate via object
Always active
Note
No
Yes
No
Yes
FCC/S 1.X.X.1 | 2CDC 508 200 D0211 Rev A 165