Features - Burkert 8694 REV.2 Operating Instructions Manual

Type 8694 REV.2
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 flexibility with regard to actuator volume and
final control speed. The low air flow rate 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
The position of the valve can be transmitted to the PLC via an analog 0/4-20 mA output (variant, without
fieldbus communication) or digitally via a fieldbus communication (e.g. büS, IO-Link).
• Digital input (for variant without fieldbus 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 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 configuration and parameterization.
Electrical interface
Pneumatic interface
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