Manual Operation; Description Of The Main Parts - Emerson Keystone EPI2 63 Installation, Operation And Maintenance Manual

Section 2: Machine Description
October 2020
2.4

Manual Operation

To be used in case of power supply failure or during actuator setting. 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 during
electric operator, an error will occur and the actuator will stop. After few seconds the
actuator will restart its operation and move the valve to the requested position.
Figure 3
2.5

Description of the Main Parts

The Keystone EPI2 actuator consists of five main parts:
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8
Local position indicator
Manual override
Mechanical gearing
Cable entries
Base flange: for coupling the actuator to the valve
Terminals enclosure: for power and signal cable connection through four
available cable entries
Mehanical gearing: internal epicyclical gear reduction, which increases the torque
of the electric motor
Control unit: integral control unit inclusive of electric motor with the relevant
driver, power and logic electronic card. By way of the mechanical gearing,
the electric motor operates the valve in normal working conditions
Manual override: for actuator manual operation in case of power supply failure or
during actuator setting
Installation, Operation and Maintenance Manual
Control unit
Terminals enclosure
Base flange
MAN-10-04-100-0711-EN Rev. 0
Machine Description