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3
4.
ACTUATOR OPERATION
4.1 Direction of rotation
In standard, the actuator closes clockwise.
☞
Switch 7
Move the switch 7 to position B for the valves closing counter-clockwise. This switch
reverses :
➩
The motor direction of rotation
➩
The limit switches
➩
The torque switches
➯
Closing counter-clockwise
4.2 Closing type
In standard, the actuator closes on limit switch.
☞
Switch 1
Move switch 1 to position B for closing on torque switch (only for actuator equipped with
torque limit switches). The associated limit switch must also be operated when the valve is
closed.
➯
Closing on torque switch
The limit switch is used for valve closed indication and also allows to detect stopping on
torque switch at mid-stroke as a fault and stopping on torque switch in closed position as
normal.
4.3 By-pass of open torque switch when starting to open from closed position
In standard, the open torque switch is active on the whole actuator stroke.
☞
Switch 6
Move switch 6 to position B to by-pass the open torque switch by the closed limit switch
when starting to open from the closed
position.
➯
By-pass the open torque switch by
the closed limit switch in closed
position
This must be used when actuator including mechanically maintained torque switches [SR
type] is set for closing on torque switch. This avoid the open torque switch to trip when