Flowserve 3400IQ Digital Positioner - Manual (Page 55)

Logix 3400IQ Digital Positioner FCD LGENIM3401-00 – 06/06
flowserve.com
1. Make sure 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.
6. Remove the five wire connections from the main PCB assembly and lift the main PCB out of the
housing.
7. Remove the four screws from the regulator base. Verify that as regulator is removed, the O-ring
and filter remain in the counter-bore.
8. Remove tubing and barbed fitting from the regulator base.
9. Install barbed fitting and tubing to the new regulator.
10. Verify O-ring and filter are in the counterbore. Install new regulator using 8-32 x 1/2" screws.
NOTE: Do not mix the regulator with those from older Logix positioners. Older models contain
regulators with different settings that will not work in the Logix 3400IQ model. The regulator
pressure setting is printed on the top of the regulator. The Logix 3400IQ regulator is set to 17.4
psig.
11. Reinstall the five wire connections.
12. Install the main PCB into the housing. Insert the retaining screw through the board into the
threaded boss and tighten evenly, using a Phillips screwdriver. Do not overtighten.
13. 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 (see Figure
16).
14. Reinstall all covers.
8.3 Checking or Setting Internal Regulator Pressure
To check or set the internal regulator pressure, refer to Figure 17 and proceed as outlined below. The
tools and equipment used in the next procedure are from indicated vendors. The following tools are
required:
• Calibrated pressure gauge (0 to 30 psi)
• 1 ⁄
16
" flexible tubing
• Barbed Tee (Clippard Minimatic part number T22-2 or equivalent)
• 3 ⁄
32
" Allen wrench
• 3 ⁄
8
" open-end wrench