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F-26748-6 © Copyright 2010 Schneider Electric All Rights Reserved. 15
CHECKOUT
This procedure is for checking out a normally closed actuator that is typically mounted
unpowered. It is possible to mount the actuator with power applied for special applications.
Note: To check out a normally opened actuator the procedure is the same as below, except
the initial position is open and closed when powered.
After the entire system has been installed and the actuator has been powered up, the
following check can be made for proper system operation. Check for correct operation of the
damper while actuator is being stroked.
1. Apply power to the actuator and control system.
2. Set the controller to cause the actuator to drive open (set override controller output to
maximum).
3. Check to see that the actuator travels to the full-open position.
4. Set the controller to cause the actuator to drive closed (set override controller output to
minimum).
5. Check to see that the actuator travels to the fully closed position.
Note: If anticipated damper operation does not occur, verify the Long Damper Shaft or
Short Damper Shaft mounting procedures. Also, verify that the controller has the proper
action (direct or reverse) to match the damper required operation.
THEORY OF OPERATION
The actuator is, by means of dual mounting clamps, directly mounted onto the damper shaft.
The anti-rotation bracket supplied with the actuator prevents lateral movement of the
actuator. The damper actuator is not provided with and does not require any limiting
switches, but is electronically protected against overloading.
The angle of rotation is electronically limited to 92° ±1°. When reaching the damper or
actuator end position, the motor stops automatically. The position of the actuator is indicated
by means of scale reading 0 to 95°.
MAINTENANCE
Regular maintenance of the total system is recommended to assure sustained optimum
performance. The MS40-717X actuator is maintenance free.
FIELD REPAIR
None. Replace with functional actuator.