Installation
Operation
Automax Valve Automation Systems
APEX 7000 Pneumatic Positioner
FCD AXENIOM0125-00
Maintenance
Principles of Operation:
The Apex 7000 positioner causes rotation (or linear movement) of valve actuator in proportion to an input signal. This
signal may take the form of pneumatic pressure (Model 7000 and 7600) or electric current (Models 7100,7200 7400
7500). Supply pressure is directed to the actuator through a precision spool valve. As input pressure is varied, the
balance beam shifts away from its neutral position. The spool also shifts and a differential pressure is created across
the actuator causing rotation (or linear movement). Actuator motion is fed back through the positioner shaft and cam.
Cam rotation causes movement of the feedback arm, changing compression in the feedback spring, forcing the
balance beam and spool back to their neutral position. This shuts off the flow of air to the actuator and rotation stops
.
Installation:
The Apex 7000 positioner can be installed on rotary and linear actuators. Actuators can be either double acting or
spring return. Positioners can be set up for rotation in either direction ( direct or reverse acting).
Supply Air Requirements:
Air pressure must be limited to 150 psi for supply and 30 psi for instrument signal to avoid damage to the positioner.
Supply air must be clean, dry and oil free instrument quality air in accordance with ISA S7.3 specifications ( dew point
>18 degrees below ambient temperature, particle size <5 microns, oil content <1ppm.
Mounting:
The following instructions apply to rotary actuators only. Linear applications require special mounting and coupling
(consult factory).
1. Mount bracket to actuator. Tighten bolts finger tight only at this time. A standard bracket is available for
mounting to NAMUR compliant actuators.
2. Install coupler (not required if installing to a NAMUR compliant actuator) on actuator shaft making sure it is
centered.
3. Verify that orientation of actuator ( and coupler ) flats match positioner shaft flats. If necessary, rotate the cam
before installing positioner ( see “Cam Installation”).
NOTE: Actuator should be in orientation corresponding to
zero input signal.
4. Install positioner onto bracket. Make sure positioner shaft and coupler are engaged and centered. Tighten bolts
finger tight only at this time.
Pneumatic Connections:
All pneumatic connections, the supply, both output ports, and instrument ports are
female ¼” NPT. All connections require user-supplied tubing fittings.
Caution:
Do not use Teflon tape as a pipe
thread sealant. Use only a liquid or paste non-hardening pipe sealant on the threads.
5. Connect positioner ports C1 and C2 to actuator. Port C2 is
always
connected to the actuator port used to drive
actuator away from its start or fail position ( the factor cam setting is full clockwise at minimum input ). Port C1 is
connected to the opposite port or may be plugged for spring return actuators.
Note: For fail counterclockwise
applications, the cam must be flipped over so the “R” side is facing upwards (see “Cam Installation”).
