User Guide - Eurotherm Ltda

nanodac RECORDER/CONTROLLER: USER GUIDE4.7.5 Advanced Loop Slave PID menuAdvanced Loop.Slave PIDControl ActionPB UnitsDerivative TypeSched TypeNumber of SetsRemote InputActive SetBoundary 1-2Boundary 2-3PBTiTdR2GCBHCBLMRLBTOutput LowOutput HighPB2Ti2Output Low 3Output High 3ReverseEngineeringErrorRemote30Set30020.0360 sec60 sec1.0AutoAuto0.0%100 sec-100%100%23.0360.0 sec-90.0%90.0%Figure 4.7.5 Advanced Loop Slave PID Menu (Typical)Control ActionPB UnitsDeriv TypeSelect ‘Reverse’ or ‘Direct’.‘Reverse’ means that the output is ‘on’ when the process value (PV) is below the targetsetpoint (SP). This is normal for heating control.‘Direct’ means that the output is on when PV is above SP. This is normal for cooling control.Select ‘Engineering’ or ‘Percent’.‘Engineering’ displays values in (for example) temperature units (e.g. °C or °F).‘Percent’ displays values as a percentage of loop span (Range High - Range Low).‘Error’ means that changes to PV or SP cause changes to the derivative output. Derivativeon error should be used with a programmer since it tends to reduce ramp overshoot.‘Error’ provides rapid response to small setpoint changes which makes it idealfor temperature control systems.‘PV’ means that changes in PV alone cause changes to the derivative output. Typicallyused for process systems using valve control, as it reduces wear on the valve mechanics.Page 114HA030554Issue 7 Nov 12