Saia-Burgess Controls AG
Manual for PCD7.L79xN room controllers
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Document 27 / 602
E
N02 │ 2013-11-27
Funktion, regulation
Function
3-22
3
3.4
Functions, regulation
Heating:
Set-point
Cooling
Y
Comfort
Standby
Frost protection
XW
Reduced
Basic setpoint
After a restart, the active base set-point (register 41) is initialised with the base set-
point value from the configuration (register 37). The active base set-point can be
changed any number of times by the communication function. The control set-point
is made up of the active base set-point and any adjustment by the room control
unit. Manual adjustment of the set-point (register 34) is only possible in Comfort and
Standby modes. In 'Reduced' operation, the controller works with the active base set-
point alone.
Control set-point in Reduced operation:
Set-point
= Active base set-point
Control set-point for Comfort and Standby modes:
Set-point
= Active base set-point (register 41) + set-point adjustment (register 34)
Control
The controller works with 2 independent PI controllers, one for heating and one
for cooling. Each PI controller can be configured to the needs of the system with
a proportional band and a run-down time. The dead zone between heating and
cooling is dependent on the operating mode and can be parameterised separately for
Comfort, Standby and Reduced operation.
Where the FBoxes are used, the parameters can be found in the Config FBox.
See section on "Function, settings, control parameters".
In all other cases, the settings can also be entered directly via the internal register in
the controller. Please note that all configuration parameters are held in the controller
EEPROM, and so cannot be written to cyclically.
