Flowserve 500+ Series Logix - Manual (Page 47)

User Instructions - Logix® 500+ Series Digital Positioners FCD LGENIM0105-10 11/13
flowserve.com 47
17.7 Replacing a Main Board
Removal
1
Make sure the valve is bypassed or in a safe condition.
2 Remove the outer cover.
3 Disconnect the power to the positioner.
4 Remove the inner cover. See Figure 42: Inner Cover
above.
5 Disconnect the power cable to the main board.
6 Disconnect the auxiliary card cable if present. See
Figure 44: Auxiliary Card on page 46.
7 Disassemble the switch mechanism if present.
8 Remove the inner cover by removing the 6 retaining
screws. See Figure 42: Inner Cover.
9 Remove the screws from the main circuit board. See
Figure 45: Main Board Screws.
10 Gently lift the main board rotating the bottom up while
keeping the top in place.
11 Disconnect the pressure sensor board cable, the hall
sensor cable, the piezo cable and the feedback cable.
(Use a small flat screwdriver to pry the locking features
and carefully separate the connector from the main
board. Be careful not to pull the cable, as this may
cause damage to the cable.)
Installation
1
Place the main board on the positioner base with the 4-
20 mA input on the same side as the electronic access
ports.
2 Lift the main board rotating the bottom (configuration
switches) upwards while keeping the top in place.
3 Connect the pressure sensor board cable, the hall
sensor cable, and the feedback cable. Ensure the
connector’s locking features engage.
4 Place the main board on the positioner base, ensuring
the cables are clear of the feedback gears. Insert the
two retaining screws.
5 Replace the inner cover by inserting the 6 retaining
screws.
6 Calibrate.
Figure 45: Main Board Screws
Figure 46: Main Board Connectors
17.8 Replacing the Pressure Sensor
Board
Removal
1
Remove the main board. See procedure above.
(Disconnecting the hall sensor and feedback cables is
not required.)
2 Unscrew the 6 screws holding the pressure sensor
board in place.
3 Remove the pressure sensor board.
Installation
1
Place the pressure sensor O-rings in the three holes.
2 Cover the O-rings with the pressure sensor board.
3 Insert the 6 screws. Tighten until the pressure sensor
board makes firm contact with the base.
Calibration
1
Initiate a Pressure or Triple Calibration from the LCD or
DTM.
2 To calibrate the supply pressure sensor 0 value,
disconnect the supply air. Go to Edit Variables. Write
the value from variable 74 (PS ADC Count) to variable
71. (PS ADC Count at 0 psi). Reconnect the supply air.
3 To keep the calibration values even after a Factory
Reset, write a 1 to Variable 104.
Figure 47: Pressure Sensor Board
Feedback
Pot
Connector
Piezo
Connector
Pressure
Sensor
Connector
Hall
Sensor
Connector
Main
Board
Screws
Pressure
Sensor
Screws