User Guide

Table Of Contents
F-15479-8 © Copyright 2007 TAC All Rights Reserved. 37
4. Insert a screwdriver through the access hole and engage the notched cam nearest the
front of the actuator.
Figure-38 Limit Switch Adjustment.
5. Turning the cam CW (as seen from the front of the actuator) increases the length of the
actuator rotation. Each click of the cam represents about a 3° change in actuator
rotation.
6. After adjusting the cam, check the rotation of the actuator by shorting actuator terminal
x to terminal 3 to drive the actuator to its new CCW limit setting.
7. If the travel is not what is desired, repeat steps 2 through 6 until desired results are
obtained.
Auxiliary Switch
Adjustment
Refer to the actuator selection tables beginning on page 3 for the actuators that include an
auxiliary switch. The adjustable SPDT auxiliary switch is actuated by the cam nearest the
back of the actuator. It is factory set to switch near the CW end of actuator rotation.
Terminal
1, the common of the switch, is made to terminal 5, from the CCW end of rotation
until the switch point, then terminal 1 is made to terminal 6 for rest of the stroke.
Note: The auxiliary switch is made from terminal 1 to terminal 5 when the switch follower is
on the low part of the cam, and from terminal 1 to terminal 6 when the switch follower is on
the lobe of the cam.
To adjust the switch point of the auxiliary switch, follow the steps shown below.
Note: If the actuator travel has been increased beyond 180°, the auxiliary switch may,
depending on its switch point, operate twice in the actuator stroke.
1. Remove the top cover of the actuator.
2. The actuator should be powered and positioned to desired point in actuator stroke for
the auxiliary switch to operate.
3. The access hole for the auxiliary switch adjustment is located in top plate of the actuator
directly ahead of the terminal block in the back of the actuator. Refer to
Figure-39.
Actuators manufactured after 1976 have plastic funnel shield inserted in the access
hole.
Caution: Disconnect the power to the actuator at the power terminals (H and G or L1 and
L2) plus the auxiliary switch terminals (1, 5, and 6). More than one disconnect may be
required.
Access
Hole