Flowserve 3400IQ Digital Positioner - Manual (Page 116)

Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
Trooper 49 3.00 4.00 0.05 10.0 77.5 sq. in.
Automax R1 0.30 0.50 0.05 10.0 3 to 5 sq. in.
R2 1.00 1.50 0.05 10.0 9 to 12 sq. in.
R3 1.30 2.00 0.05 10.0 16 to 19 sq. in.
R4 2.00 2.50 0.05 10.0 27 to 37 sq. in.
R5 2.50 3.60 0.05 10.0 48 to 75 sq. in.
R6 4.00 5.00 0.05 10.0 109 sq. in.
Spool Valve
The spool valve is a four-way directional valve with precision features to provide optimal control
and low air consumption. To help prevent spool valve malfunction, the positioner supply air must
conform to ISA Standard S7.3 (a dew point at least 18 degrees below ambient temperature, particle
size below 1 microns, oil content not to exceed 1 part per million). Flowserve’s standard coalescing
filter is highly recommended to help meet these requirements.
Small particles, oil that has varnished, corrosion, ice, burrs, and extreme wear could cause the spool
valve to act abnormally. If the spool valve is suspected of sticking, it can be inspected by performing
the following.
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 spool valve cover by removing the screw and sliding the cover assembly backwards
until the tab is clear of the slot.
4. Inspect the coalescing filter element in the spool valve cover for signs of oil, water and debris
that may have come from the air supply. A clean filter is white.
5. Remove the two phillips-head screws holding the spool valve to the housing. Inspect the free
movement of the spool by carefully sliding the block up and down on the spool about 0.25
inches. The block should slide on the spool with no resistance. Carefully remove the block,
ensuring it is removed concentric with the spool.
6. Inspect the block and spool for oil, water, debris and wear. If oil, water and/or debris are found,
the spool and block can be cleaned with a non-residue cleaner, lint-free cloth and soft bristle
brush. If wear is found, replace the driver module assembly per the IOM manual.
7. Before re-assembly, verify that the three O-rings are in the counter-bores on the machined
platform where the spool valve block is to be placed.
8. Carefully slide the block over the spool, using the machined surface of the housing base as a
register. Slide the block toward the driver module until the two retaining holes line up with the
threaded holes in the base. If resistance is still encountered, re-clean both parts or replace the
driver module assembly. Refer to the IOM manual for spare part kit numbers.
Refer to the instructions in the Logix Series 3400IQ Digital Positioner IOM under Driver Module
Assembly for further instructions.
Advanced Features
Standard vs. Advanced Diagnostics:
Question: What is the difference between a model with standard diagnostics and a model with
Advanced diagnostics?