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4. Set Up and Calibration Procedures - Setting End-of-Travel Limit Switches (actuators mfd. after 1/1/03)
ATTENTION
Make sure not to set the switch too close to the hard stop.
REFERENCE
An unactuated switch will have its normally closed (NC) contacts closed and its normally open (NO)
contacts open.
An actuated switch will have its NC contacts become open and its NO contacts become closed. Both NC
and NO contacts are available to the customer on the terminal board (see Figure 13 page 26).
An unactuated switch has its roller arm in the up position when adjacent to the reduced diameter portion of
the cam.
Setting End-of-Travel Limit Switches (actuators mfd. after 1/1/03)
WARNING
While the unit is powered, a potentially lethal shock hazard exists inside the case.
ATTENTION
The first two cams (starting from the back) are for the 0 % and 100 % limit switches and should not need
any adjustments as they are factory set to stop the drive at 0 % and 100 %.
To adjust the limit switch cams (see Figure 20):
1. Remove the cover (terminal cover, see Figure 1).
2. Using a slotted screwdriver on the slots at the edge of the cams, or your finger, rotate the cams until the
switches are set (see Figure 20).
•
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 left-hand scale or 100 % for CW operation
using the right hand 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. Both
the NC and NO contact states are available to the customer at the terminals (see Figure 13 page
26).
•
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 left-hand scale or 0 % for CW operation
using the right hand 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.
68
10260S HercuLine® Actuator Installation, Operation and Maintenance Manual
Revision 5
7/07
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Troubleshooting
