Burkert 8681, Руководство по эксплуатации

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Special designs
19 SPECIAL DESIGNS
19.1 Control head for double-acting actuators
This design is configured 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 configured for all electrical designs.
This control head differs 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 flow 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