AERCO Belimo AF120-S US Actuator - Manual (Page 4)

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Rotation Limitation
The angle of rotation limiter, ZDB-AF2 US, is used in conjunction with the tab on the
universal clamp or IND-AF2 position indicator which comes with the ZDB-AF2 US. In
order to function properly, the clamp or indicator must be mounted correctly.
See Figure A.
The ZDB-AF2 US may not work in certain mounting orientations using the ZG-106 or
ZG-107 mounting brackets. It will not work with the ZG-108 mounting bracket.
Limiting the damper rotation must be accomplished by adjusting the crank arm
linkage.
The ZDB-AF2 US may be used in 2 ways to control the rotational output of the AF
series actuator. One use is in the application where a damper has a designed
rotation less than 90°. An example would be a 45° or 60° rotating damper. The
other application would be to set a minimum damper position which can be easily
set or changed without having to remove the actuator from the damper.
Damper Rotation Limiting
1. Determine the amount of damper rotation required.
2. Locate the Angle of Rotation Limiter (ZDB-AF2 US) on the actuator so that its
edge lines up with the degree graduation on the actuator face which corresponds
with the required rotation. See Figure C.
3. Find the appropriate cross-hair location through the slot of the limiter. This is the
screw mounting location.
4. Pierce through the label material to allow easy fastening of the retaining screw.
5. Position the limiter back to the desired position, making sure the locating “teeth”
on the limiter are engaged into the locating holes on the actuator.
6. Fasten the limiter to the actuator using the self tapping screw provided.
7. Test the damper rotation either manually with the manual crank or apply power
and if required, a control signal. Re-adjust if necessary.
Installation Instructions
Mechanical Installation
20
30
40
Screw secured at
these cross hairs
20
30
40
Angle of rotation
is now set at 40
°.
20
30
40
Secure angle-of-
rotation limiter
Screw
Philips screwdriver
FIGURE C – ZDB-AF2 US, Securing the Angle of Rotation Limiter
M40024 - 05/10 - Subject to change.
© Belimo
Aircontrols (USA),
Inc.