3.1.6 Closing Actuators
3.1.6.1 Electric Actuators
Inputs activate the PLC and associated relays to activate an electric actuator(s)
attached to the container valve to close. The electric actuator is set to close the
container valve at a set torque of 30Nm and once this is achieved the electric
actuator is stopped via current feedback and timer. The torque for the electric
actuator is set in the factory by adjustment of a potentiometer inside the cover of the
motor and tested using a torque wrench. The timer will cut the power to the electric
actuator once the set time programmed in the PLC is reached.
The sequence of shutdown is set to activate the actuator, close the container valve,
stop the electric actuator once the desired torque is reached and electric current
feedback signal is reached. To prevent the electric actuator from running if there is no
feedback electric current signal a timer has been set to stop the electric actuator after
a set time that assures the valve is closed.
3.1.6.2 Pneumatic Actuators
These inputs activate the PLC and associated relays to activate an pneumatic
actuator(s) attached to the container valve to close. The pneumatic actuator is set to
close the container valve at a set torque of 20-30Nm and once this is achieved the
pneumatic actuator is stopped via a timer which shuts the air supply to the actuator
after 5 seconds.
The torque for the pneumatic actuator is set by the air pressure supply.
The sequence of shutdown is set to activate the actuator, close the container valve,
stop the pneumatic actuator once the desired torque is reached and timer feedback
signal is reached.
3.1.6.3 Air Regulator
The Air regulator provides a regulated (400 kPa Minimum-600 kPa Maximum) air
pressure supply to operate the pneumatic actuator.
3.1.6.4 Air Pressure Switch
Senses the pressure in the compressed air supply to the system and provides an
output to the Control Panel if the working air pressure is less than the set point
(normally 400 kPa).
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