Burkert 8681 - 19 SPECIAL DESIGNS; Control Head for Double-Acting Actuators; Activation (Double-Acting)

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Special designs
19 SPECIAL DESIGNS
19.1 Control head for double-acting actuators
Thisdesignisconguredfordouble-actingactuators.Ofthetwointernalsolenoidvalves,oneisdesigned
for NC mode of operation and the other for NO mode of operation.
19.1.1 Anomalies
Thisvariantcanbeconguredforallelectricaldesigns.
This control head diers from control head Type 8681 (standard) in the following points:
•Solenoidvalve1:NC/NormallyClosed;
Solenoidvalve2:NO/NormallyOpen(asaresultsafetyposition)
•TheowratefromPtoA2mayberestrictedto50l/minonly,otherwiseareliable
switchover(fromA2toR)cannotbeguaranteed!
•onlyautomaticTeachfunction(Autotune)1and2possible
19.1.2 Fluid diagram
See “Fig.3:Fluiddiagram(designfordouble-actingactuators:2solenoidvalves,NC*+NO**)”onpage18.
19.1.3 Activation of a double-acting actuator
Toopenorclosetheprocessvalve,bothsolenoidvalves(V1andV2)mustbeactivatedsimultaneously:
Process valve 24 V / 120 V AS interface DeviceNet
Solenoidvalve(V) V1 V2 V1 V2 V1 V2
Open
Y1=ON Y2=ON D0=1 D1=1 Bit0=1 Bit1=1
Close Y1=OFF Y2=OFF D0=0 D1=0 Bit0=0 Bit1=0
For further information on the electrical installation and programming, see the relevant chapters for the indi-
vidual standard designs:
24 V - design: “1024VDC-Design”onpage40,
120 V - design: “11120VAC-Design”onpage47,
AS-i - design: “12ASInterface-Design”onpage53,
DVN - design: “13DeviceNet-Design”onpage62.
english
Control Head Type 8681