Logix
®
Digital Positioners FCD LGENIM0110-0 05/16
flowserve.com
39
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 37: Pressure Sensor Board
27.7 Replacing and Cleaning a Spool
Valve
The spool valve routes the supply air to one side of the
actuator while venting the opposite side (See Figure 2).
The position of the spool valve is controlled by the driver
module.
Removal
1
Remove the spool valve cover by removing the screw
and sliding the cover assembly backwards until the
tab is clear of the slot. The sheet metal cap,
hydrophobic filter, and O-ring should be removed with
the spool valve cover. It is not necessary to take
these parts out of the spool valve cover. See Figure
38.
2
Being careful not to lose the nylon washer, remove
the Phillips-head screw that attaches the driver
module to the main housing. See Figure 39.
CAUTION:
Spool (extending from the driver module
assembly) is easily damaged. Use extreme caution when
handling spool and spool valve block. Do not handle the
spool by the machined portions of spool. The tolerances
between the block and spool are extremely tight.
Contamination in the block or the spool may cause the
spool to hang.
3
Remove the spool valve block by removing the two
Phillips-head screws and carefully sliding the block off
the spool. See Figure 39.
4
Carefully remove the spool by sliding the end of the
spool out of the connection clip. Excessive force may
bend spool.
Cleaning
1
Using acetone and a cotton cloth wipe down the block
and manifold.
2
Use cotton swabs to reach inside air passage ways.
3
Dry components thoroughly.
CAUTION:
Follow precautions on acetone label and
MSDS.
Installation
1
Verify that the three O-rings are in the counterbores
on the machined platform where the spool valve block
is to be placed. (Figure 42).
2
Carefully slide the spool into the connecting clip on
the top of the driver module assembly.
3
Carefully slide the block over the spool, using the
machined surface of the house base as a register.
(Figure 39). Slide the block toward the driver module
until the two retaining holes line up with the threaded
holes in the base.
4
Install the two spool-valve screws and tighten
securely with a Phillips screwdriver (See Figure 39).
5
Slide the spool valve cover assembly over the spool
valve until the tang engages in the housing slot.
Install spool valve cover screw and tighten securely
(See Figure 38).
Figure 38: Spool Valve Cover Assembly
Figure 39: Spool and Block
Pressure
Sensor
Screws
