Burkert 8630 Instructions De Service page 93

CONSTRUCTION FEATURES:
• Design:
for single/double-acting actuators
• Path measuring system:
high linear resolution with plastic potentiometer. Freely
coupled to the piston rod of the actuator
• Electronic system piloted by a microprocessor:
ensure an efficient configuration, control, and drive of the
actuator
• Control unit:
Operation of the Top Control by mean of 3 keys.
An 8 character LCD ensures the display of setpoint, position,
and configuration functions.
• Positioning system:
The positioning system is composed and requires 2 solenoid valves for single-acting actuators (air inlet; exhaust air), or 4
solenoid valves for double-acting actuators (2 for air inlet; 2 for exhaust air).
The controller with a PWM-voltage powers the valves according to the rocker principle which allows fast positioning volumes
to be reached as required.
A large flexibility concerning the volumes of the chambers and the positioning speed is reached in that way. For use of
actuators with larger volumes, the positioning valves are fitted with membrane amplifiers in order to increase the maximal flow
and optimise the dynamic of the system.
As an option with single-acting actuators, a fast pressurizing/venting version is available with an additional pressurizing
valve and venting valve. This enables the actuator to be completely pressurized and vented more rapidly. This is used with
the tight-closing function (see chapter "
Fig. 3.3: Pneumatic connection
• Top Control Continuous body:
Protected against internal over-pressure, (eg. air leakage) by a pressure limit valve.
Protection against non-authorised opening of the cover by a seal or self-cutting screws.
92
Fig. 3.2: Electrical connection
") and on activating a safety position of 0 or 100% (see chapter "
• Position indicator (option):
2 inductive approximate value switches (capacitive
switches) or mechanical limit switches. Signalling the high or
low limit positions of the actuator by a digital output or via a
PLC. Positioning screws allow free adjustment of the limit.
• Electrical connection (Fig. 3.2):
Multipole connector, cable glands with terminals, or
QUICKON box connection.
• Pneumatic connection (Fig. 3.3):
1/4'' connection brass or stainless steel
with various connection types (G, NPT, RC)
").
Operating instructions no. 800607