Flowserve 3400IQ Digital Positioner - Manual (Page 63)

63
Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
flowserve.com
4. Insert two screws through the stiffener plate and pressure sensor board into the threaded holes
in the housing and tighten evenly, to 8 in-lb.
5. Connect the ribbon cable on the pressure sensor board to the main PCB assembly.
6. Install the plastic board cover. Insert the three retaining screws through the plastic cover into the
threaded boss and tighten evenly, using a Phillips screwdriver. Do not overtighten.
7. Reinstall all covers.
8. Reconnect power and air supply to the positioner. Use the Host software or a handheld
communicator to perform a pressure sensor calibration.
8.9 User Interface Board
The user interface board provides a connection point inside the explosion-proof housing for all
hookups to the positioner.
Replacing the User Interface Board
To replace the user interface board, refer to Figures 6, 11, 15 and 25 and proceed as outlined below.
The following tools are required:
• Phillips screwdriver
c WARNING: Observe precautions for handling electrostatic sensitive devices.
1. Make sure the valve is bypassed or in a safe condition.
2. Disconnect the power and air supply to the unit.
3. Remove the main cover.
4. Remove the plastic board cover by removing the three retaining screws (see Figure 16).
5. Remove the retaining screw from the main PCB assembly and lift the main PCB out of the
housing (see Figure 16). It is not necessary to disconnect all of the wires, only the UI plug.
6. Remove the user interface cover.
7. Disconnect the field wiring from the user interface board terminals and remove the three screws
that hold the user interface board in the housing (see Figure 6).
8. Remove the user interface board, carefully pulling the wiring through the bore.
9. Verify that the O-ring is in place in the counterbore in the positioner housing, or on the plug on
the back of the UI tray.
10. Feed the wires on the back of the new user interface board through the passageway into the
main chamber of the housing.
11. Set the user interface board in place and secure with three screws (see Figure 6).