Temperature Controller - Staveb AG

3-14 Configuration and Basic OperationManipulated variable (MV)100%Figure 3.17 Direct/Reverse OperationManipulated variable (MV)100%0%High temperatureLow temperature Set value (SP)Direct operation0%High temperatureLow temperature Set value (SP)Reverse operationFor example, when the process value (PV) temperature is lower than the setpoint (SP) temperature in a heating control system, the manipulated variable(OUT1) increases by the difference between the PV and SP values.Accordingly, this becomes reverse operation in a heating control system, oralternatively, direct operation in a cooling control system.Direct/reverse operation is set in the Direct/Reverse Operation parameter(Initial Setting function group). Note: The Direct/Reverse Operationparameter default is reverse operation.Example Operation ProcedureIn this example, the Input Type, Temperature Unit, Direct/Reverse Operation,and Control Period (OUT1) parameters will be monitored.Input Type = 0: K thermocoupleTemperature Unit = c: °CDirect/Reverse Operation = or-r: reverse operationControl Period (OUT1) = 20 seconds1. Press the key for at least 3 seconds to move from the Operationfunction group to the Initial Setting function group.Figure 3.18Operation function groupPV/SPPublication 900-UM003C-EN-E - January 2004