Burkert Type 8694 - Manual (Page 14)

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Systemdescription
5.4.2. Features
• Models
for single-acting valve actuators.
• Position measuring system
Contactless and therefore wear-free position measuring system.
• Microprocessor-controlled electronics
for signal processing, control and valve control.
• Control module
The device is controlled via 2 buttons and a 4-pole DIP switch. 2x 2-colored LEDs indicate different statuses of
the device.
• Control system
The control system consists of 2 solenoid valves. One valve is used to aerate and another to deaerate the
pneumatic actuator. The solenoid valves operate according to the rocker principle and are controlled with a
PWM voltage via the controller. Doing so achieves a higher flexibility with regard to actuator volume and final
control speed. The direct-action model has an orifice of DN 0.6. In larger pneumatic actuators the solenoid
valves feature diaphragm amplifiers to increase the maximum flow and therefore to improve the dynamics (DN
2.5).
• Position feedback (optional)
The position of the valve can be transmitted to the PLC via an analog 0/4-20 mA output.
• Binary input
If a voltage > 10 V is applied, SAFE POSITION is activated, i.e. the valve is moved to the safety position
(factory setting, can be changed with communications software).
Pneumatic interface
Electrical interface
• Pneumatic interfaces
1/4“ connections with different thread forms
(G, NPT)
hose plug-in connection
• Electrical interfaces
Circular plug-in connector or cable gland
• Body
The body of the positioner is protected from excessively high internal pressure, e.g. due to leaks, by a pressure
limiting valve.
• Communications interface
For configuration and parameterization.
English
Type 8694