Equipment/ functions - Process Valve Solutions

14
Design principle
Control unit
2 Depending on the type of valve the actuator
must be switched-off in the end position by
limit or torque switches.
For this purpose two independent measuring systems
(limit switches and torque switches) are provided
within the control unit. They measure the travel
or the torque required at the output drive, respectively.
The switches signalize to the actuator controls that
the set tripping points have been reached, which
then switch off the motor.
The control unit may optionally be equipped with a
magnetic limit and torque transmitter. The transmitter
converts the mechanical parameters limit and
torque into continuous electronic signals. In combination
with the integral controls AUMATIC tripping
points and tripping torques can be set non-intrusively,
i.e. without using tools or opening the control
unit.
Electrical connection
3 The connections for motor and control
cables are made on a 50-pole AUMA plug/
socket connector.
If the plug/ socket is disconnected for maintenance
work, the wiring remains undisturbed.
The explosion-proof actuator types SGExC are provided
with a special plug/ socket connector for explosion-proof
actuators as a standard.
Further information on page 14.
1
Mechanical position
indicator
The mechanical position
indicator is used to indicate the
valve position continuously.
End stops
4 During manual operation the internal end
stops limit the swing angle. The significant
advantage of the AUMA design is that the low input
torque, not the high output torque acts against the
end stops. Thereby high safety against damage due
to overload is assured.
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