User Guide

Rotation Limitation Rotation Limitation for MS40-7043 Series

The Stop Block is used in conjunction with the tab on the universal clamp or the AM-709

position indicator. In order to function properly, the clamp or indicator must be mounted

correctly.

The Stop Block controls the rotational output of the MS40-7043 and MF40-7043-501

actuators. It is used in applications where a damper has a designed rotation that is less than

90°, for example with a 45° or 60° rotating damper. It can also be used to provide a minimum

damper position which is easily set, or changed, without removing the actuator from the

damper.

1. Determine the amount of damper rotation required. The actuator stop block provides

limited rotation from 40° to 95°.

2. Loosen the screw securing the stop block to the actuator.

Note:

The actuator is shipped with the Stop Block mounted to the “L” side. If the damper

application requires the “R” side face the installer, simply remove the Stop Block and screw

and move it to the new location.

3. Slide the stop block into position, so that its edge lines up with the degree graduation

on the actuator face which corresponds with the required rotation. See Figure-5.

4. Secure the stop block in place.

5. Test the damper rotation by applying power and the required control signal. Re-adjust

if necessary.

Figure-5 Adjusting Stop Block for Limited Rotation.