SQM5… Reversing Actuators Technical Instructions
Document No. 155-517P25
Mar 3, 2021
Siemens Building Technologies, Inc. Page 19
Reversing Rotational Direction,
Clockwise
Figure 17. Reversing Rotat
ional Direction on the ASZ Potentiometer.
a. Reversing Rotational Direction on the ASZ Potentiometer (Gear Models).
3. Disconnect the blue and brown wires from the terminal block located on the ASZ…
potentiometer circuit board and reverse. The black wire remains connected to the
middle terminal. See Figures 17 and 17a.
4. Remove the white plastic actuator position-indicating dial by gently pulling while rotating
in the clockwise direction. See Figure 6.
5. The actuator position indicating pointer, located near the actuator gear end of the cam
drum, must point to the “0” mark on the actuator position scale (scale on the cam drum
nearest to the actuator gear end). Press and hold the black cam drum release button
while manually rotating the cam drum.
6. Loosen the black potentiometer cam attachment screw approximately one turn. Gently
wedge a small screwdriver between the potentiometer and the gray plastic housing.
Gently twist the screwdriver until the potentiometer releases from the cam drum shaft.
7. Change potentiometer end position:
Manually rotate the potentiometer position indication pointer exactly to the other
end mark (see Figure 17).
Gear models (see Figure 17a):
For clockwise rotation, manually rotate the potentiometer gear until the white line
next to the “0” mark on the potentiometer gear face is exactly in alignment with the
potentiometer gear alignment pointer.
For counterclockwise rotation, manually rotate the potentiometer gear until the
white line next to the “1” mark on the potentiometer gear face is exactly in
alignment with the potentiometer gear alignment pointer
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