User Guide

36 © Copyright 2007 TAC All Rights Reserved. F-15479-8
ADJUSTMENTS
Limit Switch
Adjustment
The counterclockwise limit switch on certain actuators provides adjustable travel of 45° to
320° rotation. The actuator selection tables beginning on page 3 identify the models that
have adjustable travel limits. To adjust travel refer to Figure-37 and Figure-38 while following
the steps shown below.
Note: The feedback potentiometers in the actuator have a fixed rotation (typically either
90° or 180°). Therefore, adjusting the travel of the actuator could affect the feedback to the
controller. The potentiometer has a slip clutch and will not be damaged by adjusting the
actuator travel. If the actuator travels beyond the limit of the potentiometer, the wiper arm
on the potentiometer will cease to rotate. The wiper arm will instantly start moving in the
opposite direction as soon as the actuator reverses direction.
1. Remove the top cover from the actuator and disconnect the field wiring from terminals,
X, 2, and 3 of the actuator.
2. The actuator should be powered and driven to its CW limit by shorting terminal X to
terminal 2. Refer to
Figure-37.
Figure-37 Actuator Output Shaft Position (Front View).
3. The access hole for the travel adjustment is located in the top plate of the actuator
directly ahead of terminal block in the front of the actuator (where output shaft extends
from actuator). Refer to
Figure-38.
Short Tooth on
Shaft at 9:00
Short Tooth on
Shaft at 3:00
Full CW Position Full CCW Position*
180
° Rotation Actuator
90° Rotation Actuator
Full CW Position Full CCW Position*
Short Tooth on
Shaft at 6:00
Short Tooth on
Shaft at 9:00
*On Certain Models the CCW Travel
Limit is Adjustable from 45 to 320°