Air Handling seq. - user manual
7| Cascade Control
Cascade Control uses the output of the return temperature controller to manipulate the setpoint of the supply
temperature controller.
CASCADE CONTROL
SCT Supply Control Min Max Default U.M. Text value
CAS Cascade Control
CS1 Proportional component 0,0 100,0 2,0 K
CS2 Integral time 0 9999 0 SEC
CS3 Min delta supply limit 0 60,0 20,0 K
CS4 Max delta supply limit 0 60,0 20,0 K
STL TemperatureLimit
TL1 Supply temp low limit -15,0 90,0 16,0 °C
TL2 Supply temp high limit -15,0 90,0 35,0 °C
Tab 28_ [Cascade control -Cascade control]
Cascade regulation is used by a sequence when its selected setpoint is “CASCADE”. (D02, D03, H12, H22, C12 =
CASCADE). In this case it is not possible to select the control probe used by the control sequence, as it is xed to the
return and supply temperature.
Setpoint for supply temperature control is calculated on the basis of the return temperature and main setpoint heat
and cool, as described in the following gure, with PI logic and with the following limits:
Return_Temperature – CS3 <= Setpoint_of_supply_Temperature <= Return_Temperature + CS4
Fig 26_ [Cascade Control - RET Return Temperature]
Calculated setpoint are then used by the control sequence to control the supply temperature.
Fig 27_ [Cascade Control - SUP Supply Temperature]
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