Burkert Type 8696 - Manual (Page 15)

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Systemdescription
5.5.2. Features
• Models
for single-acting valve actuators.
• Position measuring system
Non-contact and therefore non-wearing position measuring system.
• Microprocessor-controlled electronics
for signal processing, control and valve control.
• Control module
The operation of the device takes place via 2 keys and a 4-pole DIP switch. 2 2-coloured LEDs allow various
status displays of the device.
• Control system
The control system consists of 2 solenoid valves. One valve is used to aerate and another to deaerate the pneu-
matic 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.
• Position feedback (optional)
The position of the valve can be relayed to the PLC via an analogue 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 interfaces
hose plug-in connection ∅ 6 mm / 1/4“
on request: threaded port
• Electrical interfaces
Circular plug-in connection
• 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 8696