Flowserve 3400IQ Digital Positioner - Manual (Page 62)

Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
6
5. Disconnect the ribbon cable on the pressure sensor board from the PCB assembly (see Figure
12). Lifting the main board may make this easier.
6. Remove the two screws holding the pressure sensor board to the housing. Lift the metal
stiffener plate off the pressure sensor board and set aside for future use.
7. Remove the pressure sensor board.
Removing the Pressure Sensor Plug Plate (Standard Model)
To upgrade a standard model to an advanced model, the pressure sensor plug plate must be
removed and replaced by a pressure sensor board. The main PCB electronics automatically senses
the presence of the pressure sensor board. If present, the actuator pressure sensors are used in
the positioner control algorithm to enhance valve stability. For optimal performance, the actuator
pressure sensors need to be calibrated. The actuator pressure sensor calibration is performed
using a Handheld Communicator or host configuration software. To upgrade a standard model to an
advanced model, refer to Figures 11, 15 and 21 and proceed as outlined below. The following tools
are required:
• Phillips screwdriver
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 two screws holding the pressure sensor plug plate to the housing. Lift the metal
stiffener plate off the pressure sensor plug plate and set aside for future use.
6. Remove the pressure sensor plug plate and discard.
Installing the Pressure Sensor Board (Advanced Model)
The pressure sensor board is installed on the advanced model only. To install the pressure sensor
board, refer to Figures 11, 15 and 25 and proceed as outlined below. The following tools are required:
• Phillips screwdriver
• Torque wrench
c WARNING: Observe precautions for handling electrostatic sensitive devices.
1. Verify that the two pressure sensor O-rings (item 15) are in place in the housing.
2. Set the pressure sensor board assembly in place so that the O-rings make contact with the faces
of the pressure sensors.
3. Place the metal stiffener plate (item 12) on top of the pressure sensor board over the pressure
sensors and align the two holes in the pressure sensor plate with the threaded bosses in the
housing.