Aventics AA-1, Service Information

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SM-900.4401
AA Type Actuator Positioners
Service Information
The user of these devices must conform to all applicable
electrical, mechanical, piping and other codes in the
installation, operation or repair of these devices.
INSTALLATION! Do not attempt to install, operate or repair
these devices without proper training in the technique of
working on pneumatic or hydraulic systems and devices,
unless under trained supervision.
Compressed air and hydraulic systems contain high levels of
stored energy. Do not attempt to connect, disconnect or
repair these products when a system is under pressure.
Always exhaust or drain the pressure from a system before
performing any service work. Failure to do so can result in
serious personal injury.
MOUNTING! Devices should be mounted and positioned in
such a manner that they cannot be accidentally operated.
WARNING: INSTALLATION AND
MOUNTING
The AA-1, AB-1 and BA-1 Actuator Positioners are
pneumatic Positioners used where accuracy is required and
when the device to be operated has low force
characteristics. Typical applications are positioning the
butterfly valve of carburetors and the control arm of diesel
engine governors.
AA-1 Standard configuration, the AB-1 and the BA-1 are
constructed from this basic model
BA-1 Basic AA Type positioner with a “Vernier” feature
added by the use of an additional diaphragm that is
controlled by a separate valve (H-4 CONTROLAIR®
Valve)
AB-1 Basic AA Type positioner with a separately
controlled stop cylinder.
INSTALLATION
Mount the positioner firmly to the engine frame to
prevent relative motion between the operator rod and
the engine control arm. The positioner must be
installed with the operator rod in the same plane as
the engine control arm. Avoid interference with the
connecting link which could cause friction and
inaccuracy. For wet or dirty installations the positioner
should be mounted with the diaphragm cover (ref. 3,
page 4) up.
The most satisfactory linkage is a steel rod with ball
joints or an adjustable clevis at both ends connected
directly from the positioner to the control arm. It is very
important to utilize the full travel of the positioner and
to match the end travels of the control lever and the
positioner rod.
For mounting dimension and pipe connections refer to
the outline drawing elsewhere in this catalog.
NOTE: Before installation all air lines should be blown
free of any moisture or harmful deposits.
For more information on installation and other
applications refer to catalog SC-900.
MAINTENANCE
Periodically disassemble the positioner for cleaning
and lubrication. Refer to the appropriate exploded
view.
1. Clean all metal parts with a nonflammable solvent
and wash all rubber parts in soap and water.
2. Rinse parts thoroughly and blow dry with a low
pressure air jet.
3. Inspect all parts and replace those which are worn
or damaged.
AA-1
AB-1
Figure 1 - Typical
Assembly View