BAC_AC_SE_4_4_1_1_0_1

Application

Plant call template for a temperature-controlled ventilation system.

The main tasks of the template are:

• Plant control with the different operation modes and set values
• Temperature control for the selected sequence elements

Plant key

Ventilation system with inlet and outlet air fan and thermal air treatment

Type: BAC_AC_SE

Interface

System diagram

Block diagram

Operation modes

The plant is switched on via a timer program or a manual system switch (software).

The plant can assume the operation modes listed in the table.

Fire alarm

In case of a fire alarm, all switch-on conditions are overridden, and the system switches off. The smoke extraction functions are enabled. The two binary inputs SmExttSuA / SmExttExhA can be used for the 3 smoke extraction scenarios listed above.

Fault shutdown

The plant switches off in the event of the following faults or status messages:

• Status message fire alarm (BAC_AC_StartT_01)
• Status message frost alarm (BAC_FrstPrt_01)
• Fan fault (BAC_AC_ExtAFan_FC_01 / BAC_AC_SuAFan_FC_01)

Plant startup

The plant start program StartT is informed by the variable bAvail of the mixed air system MixAT that the prerinsing of the preheater will be skipped.
A ramp function in the subtemplate PID (BAC_AC_MixAT_PID_01) of the mixed air system MixAT (BAC_AC_MixAT_01) replaces the prerinsing of the air heater during the start-up of the ventilation system.

Temperature control

In this plant template a room air inlet air cascade is realized as control strategy.

In the templates BAC_AC_SpRmT_02 / BAC_AC_CasCtrlT_02 , the set values for the plant are generated and relayed to the sequence controllers.

Program description

Plant alarm logging

The alarm priority ALM_PRIO_CRITICAL is a fault that results in plant shutdown.

Version history