Burkert 8694 - Features

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System description
5.4.2 Features
• Models
for single-acting valve actuators.
• Position sensor
Contactless and therefore wear-free position sensor.
• 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.
2 LEDs (1 RGB LED for device status and 1 green LED for communication interface status) indicate dif-
ferent statuses of the device
• Pilot valve 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exibilitywithregardtoactuatorvolumeand
nalcontrolspeed.ThelowairowratemodelhasanoriceofDN0.6.Inlargerpneumaticactuatorsthe
solenoidvalvesfeaturediaphragmamplierstoincreasethemaximumowandthereforetoimprovethe
dynamics (DN 2.5).
• Position feedback
The position of the valve can be transmitted to the PLC via an analog 0/4-20 mA output (variant, without
eldbuscommunication)ordigitallyviaaeldbuscommunication(e.g.büS,IO-Link).
• Digital input (for variant without eldbus communication)
If a voltage > 10 V is applied, safety position (SAFEPOS) 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
G1/8“connections
hose plug-in connection Ø6 mm
• Electrical interfaces
Circular plug-in connector or cable
gland
• Housing
The housing of the positioner is protected from excessively high internal pressure, e.g. due to leaks, by a
pressure limiting valve.
• Communications interface
Forexchangingprocessdataandforcongurationandparameterization.
english
Type 8694 REV.2