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Set Up and Calibration Procedures
Setting End-of-Travel Limit Switches
Revision 7 HercuLine™ 2000 Series Actuator - Installation, Operation and Maintenance Manual 79
7/08
Table 32 End-of-Travel Limit Switch Setting Procedure
Step Action
1 Remove AC power to the actuator.
2
Remove the six screws and the cover from the actuator case. See Figure 2. Lay cover
assembly on a flat surface.
3
Using a flat blade screwdriver in the slots at the edge of the cams, or your finger, rotate the
cams until the switches are set. (See
Figure 31).
• Rotate the actuator shaft, using the manual handwheel or the auto-manual switch, to the 0%
position (this is the 0% for CCW operation using the bottom scale or 100% for CW operation
using the top scale). If the actuator is installed on a damper or valve, also make sure that
this position is synchronized with the travel of the final control element.
• Rotate the #1 limit switch operating cam to activate at this position. The switch roller arm
should go from being in an up, not depressed state, to a depressed state as the cam is
rotated in the direction of the shaft rotation going toward the limit position. This will cause
the switch to go from NC to NO and turn off the power to the motor when the switch
activates. Switch activation may be detected by the clicking sound or with a continuity tester
connected to the terminals.
• Rotate the actuator shaft, using the manual handwheel or the auto-manual switch, to the
100% position (this is 100% for CCW operation using the bottom scale or 0% for CW
operation using the top scale). If the actuator is installed on a damper or valve, also make
sure that this position is synchronized with the travel of the final control element.
• Rotate the #2 limit switch operating cam to activate at this position. The switch roller arm
should go from being in an up, not depressed state, to a depressed state as the cam is
rotated in the direction of the shaft rotation going toward the limit position. This will cause
the switch to go from NC to NO and turn off the power to the motor when the switch
activates.
• If optional auxiliary switches were ordered, these switches may also be set at this time. (See
Setting Auxiliary Switches (page 81).
4
Double check limit switch actuation by first manually driving the actuator to each end of travel
and hearing the switch click or by detecting it with a continuity tester. Secondly, drive the
actuator to both ends of travel (using the auto/manual switch or by providing minimum and full
input signal) and make sure the switches activate and turn off the motor.