Flowserve APEX 4000 Pneumatic Positioner - Manual (Page 6)

© 2003, Flowserve Corporation, Printed in USA
AXAIMO36-00 (AUTO-112) 7/03
3-Position Control/Dribble Control
SR Limit Switch Method
Automax Valve Automation Systems
Installation, Operation and Maintenance Instructions
Flowserve Corporation 1350 N. Mountain Springs Parkway 1978 Foreman Dr.
Flow Control Division Springville, Utah 84663-3004 Cookeville, TN 38501
www.flowserve.com Phone: 801 489 8611 Phone: 931 432 4021
Maintenance:
The Apex 4000 positioner is designed for long life and
trouble-free operation. The following steps should be followed
every six months to assure proper operation.
1. Check air supply and associated filtration
equipment. See “Supply Air Requirements.”
2. Make sure arms, bearings, and adjustment screws
move freely. Caution:
Moving parts to check
freedom with supply pressure connected will cause
rotation of cam. Be sure to keep fingers away from
cam pinch points. If parts do not move freely,
disassemble and lubricate with a light, instrument
grade grease (Lubriplate MAG 1 or equivalent).
3. Check for smooth operation of the spool valve. If
it sticks or feels “gummy”, remove it and clean
both spool and valve bore with solvent. Make
sure both parts are clean and dry before
reinstalling. Do NOT apply grease to these parts.
4. Check for air leaks in air supply.
5. Refer to “Troubleshooting” sections if
maintenance does not cure a problem.
Troubleshooting:
Problem Probable Cause/Solution
Actuator/Valve won’t stroke or 1. Positioner ports are connected to wrong sides of actuator.
goes full stroke with no control: 2. Cam on wrong side (see “Cam Installation”).
3. Stuck arm or spool valve (see “Maintenance”).
4. Input signal problem.
Calibration Shifts: 1. Loose mounting hardware.
2. Loose cam locking nut.
3. Loose cam locking screw.
Excessive air consumption (other 1. Spool valve seals leaking or loose screws.
than normal exhaust of 10-30 scfh): 2. Air leak between positioner/actuator or within actuator.
3. If condition occurs at end of stroke only, calibration is incorrect.
Oscillation or hunting: 1. Air leak between positioner/actuator or within actuator.
2. Oversized spool valve (decrease size).
Sluggish or slow response: 1. Undersized spool valve (increase size or add volume boosters).
2. Tubing restriction (check supply between positioner/actuator).
3. Tubing too small (increase tubing size).
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