OPERATING MANUAL
Pneumatic rotary drive units type ST | DT
Wesa-Armaturen GmbH
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Operating manual
D-73650 Winterbach
Drive units ST | DT
Date of issue 10-2019
4.1.
Check the fitting and servo drive are in their initial positions (default positions) before installation.
4.2.1.
Installation directly on fittings: Position the servo drive on the fitting, ensuring that is correctly
seated and that the fitting shaft moves easily (see note).
4.2.2.
Installation on fittings with an installation bridge: Fit installation pitches on the servo drive unit
for fastening it on fittings onto which it cannot be directly mounted. Then install the shaft adapter
in the output of the servo drive unit. Then install the fitting on the bridge. Ensure that it is seated
correctly and moves easily. Tighten all the fastening screws slightly (see note).
Important note:
After assembly, do not tighten the screws too much so as to ensure that the
components are balanced and aligned by the swing movement during the first few switch cycles and the
function test.
4.3.
Supply the servo drive unit with compressed air through compressed air connection A (2).
Important: Ensure that the rotary movement of the drive unit does not go beyond the maximum
rotary movement of the fitting.
Important safety information
Do not insert anything into the fitting and do not reach into the fitting
during the function test.
Actuate the servo drive unit and the fitting several times by supplying compressed air to the compressed
air connections alternately. Pay close attention to ensuring that the components move easily and are
aligned. When all the components have been correctly installed and the fitting is actuated perfectly,
tighten all the screws used to fasten the fitting to the drive unit with the specified torque.
4.4.
After completing the installation work, adjust the stroke limiting pins for the servo drive unit to
ensure that the fitting opens and closes correctly. Refer to section 6.0 ff. for details of the
procedure.
5.0. Removing the servo drive units
5.1.
The attached exploded drawing provides an illustration of the components and their layout.
5.2.
Disconnect the servo drive unit from all pneumatic and electrical connections.
Warning
Never dismantle a servo drive unit which is still connected to the compressed air supply. Danger
of injury
5.3.
Mechanically disconnect the servo drive unit from the fitting. If there is one, undo the installation
support or adapter to the fitting. Remove any accessory parts such as solenoid valves, limit switches
or position controllers and place the servo drive unit on a clean work bench.
5.4.
On servo drive units with adjustable stroke limits at both sides,
undo the four screws on each side cover, remove the left-hand side cover then undo the locknut
and tighten the pin on the internal stroke limit of the right-hand side cover to remove the side
cover. On servo drive units with an adjustable stroke limit at one side, remove the four screws on
the side cover and remove the side cover from the housing.
