Emerson Bettis SCE300 - Manual Operation; Description of Main Parts

8
February 2020
Installation and Maintenance Instructions
MAN-02-04-99-0712-EN Rev. 1
Machine Description
Section 2: Machine Description
2.4 Manual Operation
Manual operation is to be used in cases of power supply failure or during actuator
conguration. The manual operating device is completely independent of the motor drive
and can be operated at any time - whether or not the motor is running - without danger to
the operator. The handwheel does not rotate during power operation. To close the valve,
turn the handwheel clockwise. To open the valve, turn the handwheel counter-clockwise.
If the handwheel is turned while the actuator is under normal electric operation, an error
will occur and the actuator will stop. After a few seconds, the actuator will restart operation
and move the valve to the requested position.
Figure 3
2.5 Description of Main Parts
The SCE300 actuator consists of ve main parts:
• Base ange: for coupling the actuator to the valve
• Terminals enclosure: for power and signal cable connection through four available
cable entries
• Mechanical gearing: internal epicyclical gear reduction, which increases the torque
of the electric motor
• Control unit: integral control unit, including an electric motor with the relevant
driver, power, and logic electronic card. By means of mechanical gearing, the
electric motor operates the valve in normal working conditions
• Manual override: for actuator manual operation in cases of power supply failure or
during actuator conguration
Control unit
Local position indicator
Base ange
Mechanical gearing
Manual override
Cable entries
Terminals enclosure