Changing To Direct Action; Changing To Reverse Action - Emerson Fisher 3610J Instruction Manual

3610J and 3620J Positioners
September 2017
WARNING
Avoid personal injury or equipment damage from sudden release of process fluid and improper valve operation. Before
reversing the action:
D Wear protective clothing, gloves, and eyewear whenever possible.
D Do not remove the actuator from the valve while the valve is still pressurized.
D Disconnect any operating lines providing air pressure, or a control signal to the actuator. Be sure the actuator cannot
suddenly open or close the valve.
D When disconnecting any of the pneumatic connections, natural gas, if used as the supply medium, will seep from the
unit and any connected equipment into the surrounding atmosphere. Personal injury or property damage may result
from fire or explosion if appropriate preventative measures are not taken, such as adequate ventilation and the
removal of any ignition sources.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure.
D Vent the actuator loading pressure and disconnect positioner supply pressure.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.

Changing to Direct Action

1. Unscrew the four captive cover screws, and remove the cover (key 41, figure 28).
2. Loosen the reversing plate screw (key 49, figure 25), and adjust the reversing plate (key 23, figure 13) to expose the
letter D and cover the letter R. Tighten the screw.
Note
Direct acting 3610J and 3620J positioners require use of the counter spring (key 125, figure 25). Reverse acting 3610J and 3620J
positioners set up for 60 degree valve rotation, or reverse acting 3611JP and 3621JP positioners set up for 11 mm (7/16‐inch)
actuator travel do not require use of the counter spring. Refer to the parts list for the counter spring part number to be ordered.
3. Refer to the note above to determine if a counter spring is needed. If a counter spring is required, install the counter
spring (key 125, figure 25) by first removing the machine screw (key 127, figure 25), and the spring seat (key 126,
figure 25). Then install the counter spring and replace the spring seat and machine screw.
4. If using characterized cam B or C, refer to the Changing Cams procedures.
5. Perform the Zero and Span adjustment procedure.
6. Replace the cover.

Changing to Reverse Action

CAUTION
Do not use bypass when the valve positioner is reverse‐acting. In this case, bypassing the valve positioner sends the input
signal directly to the actuator. Such a change will affect the desired operation and possibly upset the system. Use bypass
only when the input signal range is the same as the valve positioner range required for normal actuator operation.
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Instruction Manual
D200149X012