AMOT 10GEF, Operation And Maintenance Manual, Page: 35 / 80

35
Electric Actuator
OMMG00012 Rev 12 – NOV 2019
4.7 Operation
CAUTION
Damage can be caused to the valve assembly if a cheater or extension
bar is used on the handwheel. Do not use any lever / mechanical aid
to turn the handwheel.
The actuator operates as soon as electrical power is applied. Versions with a
Positioner can be controlled by an 8071D PID controller based system or an
externally generated 4 – 20 mA. Versions without a Positioner, and those
where the Positioner is only provided to give a 4-20mA output signal are
controlled directly by switching the power supply to either of the two switched
live inputs.
Manual operation is possible at any time by disengaging electrical drive by
pulling the actuator declutching lever and turning the handwheel. Once in
Manual mode, the actuator returns to automatic mode as soon as the
declutching lever is released and the motor starts.
On failure of the actuator to operate correctly, refer to the troubleshooting
guide in Section 8.
4.8
Maintenance
The following maintenance tasks are described in this section:
•
Removal and installation onto valve body (4.8.1 – page 36)
•
Lubrication (4.8.2 – page 38)
•
Limit switch replacement (4.8.3 – page 39)
•
Limit switch adjustment (4.8.4 – page 41)
•
Potentiometer replacement (4.8.5 – page 43)
• Potentiometer adjustment (4.8.7 – page 46)
• Anti-condensation heater replacement (4.8.8 – page 48)
• Capacitor replacement (4.8.9 – page 49)
Note
The torque switches are set by the manufacturer and require no
adjustment.