ATR243 User Manual - Northern Industrial

8.3 Dual Action Heating-CoolingATR243 is also suitable also for systems requiring a combined heatingcoolingaction.The command output must be configured as Heating PID( = and with a greater than 0), and one of thealarms ( , or ) must be configured as .The command output must be connected to the actuator responsiblefor heat, while the alarm will control cooling action.The parameters to configure for the Heating PID are:= Command output type (Heating): Heating proportional band: Integral time of heating and cooling: Derivative time of heating and cooling: Heating time cycleThe parameters to configure for the Cooling PID are the following(example: action associated to alarm1):= Alarm1 selection (cooling): Proportional band multiplier: Overlapping/Dead band: Cooling time cycleThe parameter (that ranges from 1.00 to 5.00) determines theproportional band of cooling basing on the formula:Cooling proportional band = *This gives a proportional band for cooling which will be the same asheating band if = 1.00, or 5 times greater if = 5.00.The integral time and derivative time are the same for both actions.The parameterdetermines the percentage overlappingbetween the two actions. For systems in which the heating output andcooling output must never be simultaneously active a dead band( ≤ 0) must be configured, and vice versa you can configure anoverlapping ( > 0).ηττπ://νιχοντρολσ.χοm23