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1、AccessorySchematicsThesedrawingsarehelpfulindeterminingwhataccessoriesareneededandtheirproperarrangementforaparticularapplication.ThefollowingengineeringschematicsareusedbyValtekwhenattachingaccessoriestocontrolvalves.StandardPositionerControlOutput2Outp
2、ut1SignalSupplyAirFilterSchematic19-1A:PositionerSignal-to-open,Fail-closedOutput2Output1SignalSupplyAirFilterSchematic19-1B:PositionerSignal-to-close,Fail-open19-11SolenoidOperatedOn-OffASCO8345-TypBEBPAEASupplyAirFilterSchematic19-2A:Four-waySolenoid,D
3、e-energize-to-close,Fail-closedASCO8345-TypBEBPAEASupplyAirFilterSchematic19-2B:Four-waySolenoid,De-energize-to-open,Fail-open19-12PostitonerwithSolenoidOverrideOutput2Output1SupplyAirFilterSignalSOVInputSchematic19-3A:Signal-to-open,Fail-closed,I/P2000S
4、OVSignalInterrupt,De-energize-to-closeOutput2Output1SupplyAirFilterSignalSOVInputSchematic19-3B:Signal-to-close,Fail-open,I/P2000-SOVSignalInterrupt,De-energize-to-openDe-energizingsolenoidvalveinterruptsthesignaltothepositioneranddrivestheactuatortothel
5、owsignalposition.Thisisdependentontheproperfunctioningofthepositionerandtheintegrityofthefeedbacklinkage.19-13PositionerWithSolenoidOverrideOutput2Output1Supply231AirFilterSignalSolenoidASCO8320TYPSchematic19-4A:Signal-to-open,Fail-closed,Three-waySoleno
6、idSignalInterrupt,De-energize-to-closeOutput2Output1Supply231AirFilterSignalSolenoidASCO8320TYPSchematic19-4B:Signal-to-close,Fail-open,Three-waySolenoidSignalInterrupt,De-energize-to-openDe-energizingsolenoidvalveinterruptsthesignaltothepositioneranddri
7、vestheactuatortothelowsignalposi-tion.Thisisdependentontheproperfunctioningofthepositionerandtheintegrityofthefeedbacklinkage.19-14213Output2Output1SolenoidASCO8320TYPSupplySignalAirFilterSchematic19-5A:Signal-to-open,Fail-closed,Three-waySolenoidOverrid
8、e,De-energize-to-close213SolenoidASCO8320TYPOutput2Output1AirFilterSupplySignalSchematic19-5B:Signal-to-close,Fail-open,Three-waySolenoidOverride,De-energize-to-openSoleniodmustberatedformaximumsupplypressureatallports.De-
