Burkert Type 8693 - Manual (Page 18)

18
Description of system
6.2. features
• models.
for single-acting or double-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.
Operation of the device is controlled by four keys. The 128x64 dot matrix graphics display enables you to
display the set-point or actual value and to configure and parameterize via menu functions.
• control system.
The control system consists of 2 solenoid valves for single-acting actuators or four solenoid valves for double-
acting actuators. In single-acting actuators, one valve serves for the aeration and another for the deaeration
of the pneumatic piston actuator. Double-acting actuators feature 2 valves for aeration and deaeration. The
solenoid valves operate according to the rocker principle and are controlled with a PWM voltage via the con-
troller. 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. On larger pneumatic actuators the solenoid valves feature diaphragm
reinforcers to increase the maximum flow and therefore improve the dynamics (DN 2.5).
• position feedback (optional).
One inductive proximity switch.
When the valve reaches an upper or a lower position, this can be relayed e.g. to a PLC via binary outputs. By
means of set-screws, the operator can change the inductive proximity switch or limit positions.
• 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. caused by leaks, by a
pressure limiting valve.
english
Type 8692, 8693