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SQM5... Reversing Actuators
Potentiometer
Removal
Potentiometer
Installation
Siemens Building Technologies, Inc.
Remove the white plastic actuator position-indicating dial by gently pulling while rotating in
the clockwise direction. See Figure 6.
Disconnect the blue, black and brown wire from the potentiometer terminal block. See
Figure 17.
Remove the silver potentiometer alignment screw.
Loosen the black potentiometer cam attachment screw approximately one turn.
Gently wedge a small screwdriver between the potentiometer and the gray plastic
housing.
Carefully twist the screwdriver until the potentiometer releases from the cam drum shaft.
Remove the ASZ... potentiometer.
1. Install the new ASZ... potentiometer by gently sliding the bushing over the cam drum
shaft.
2. Align the potentiometer alignment screw hole with the hole in the gray plastic housing
and install the potentiometer alignment screw. See Figures 17 and 17a.
3. 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. See Figure 6. The
scale is located 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.
4. If installing a potentiometer without gear, manually rotate the potentiometer pointer
until the pointer is exactly in the "min" position. See Figure 17. Firmly tighten the
black potentiometer cam attachment screw while manually holding the potentiometer
pointer in alignment. Check the alignment again.
5. If installing a gear model potentiometer, manually rotate the potentiometer gear until
the white line next to the "0" or "1" mark on the potentiometer gear face is exactly in
alignment with the potentiometer gear alignment pointer. See Figure 17a.
For counterclockwise (ccw) operation the line beside the "1" mark must exactly align
with potentiometer gear alignment pointer. For clockwise (cw) operation the line
beside the "0" mark must exactly align with potentiometer gear alignment pointer.
Firmly tighten the black potentiometer cam attachment screw while manually holding
the potentiometer gear in alignment. Check the alignment again.
6. Connect the bundled blue, black and brown potentiometer wires to the terminal block
located on the ASZ... potentiometer board. See Potentiometer Installation and
Figures 17 and 17a.
7. Re-install the white actuator-indicating dial by gently pressing it onto the
potentiometer cam attachment screw. Align scale position "0" on the actuator position
indicating dial with the dial pointer by rotating the dial in the clockwise direction to
avoid loosening the potentiometer gear attachment screw. See Figure 6.
Technical Instructions
Document No. 155-517P25
Mar 3, 2021
Page 25
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