Hall Effect Sensor Adjustment - Chamberlain LiftMaster Professional SL540 Manual

NOTE: Normally the Hall Effect sensor does not need adjustment,
but may go out of alignment due to shipping vibration or rough
handling.
These operators use an internal entrapment protector system.
This system consists of the GL control board, magnet, and Hall
Effect sensor. It may become necessary to adjust the sensor for
correct alignment. To do so please perform the following steps:
1. The sensor must be centered over the magnet wheel. Adjust
with horizontal screws.
2. The sensor must be level.
3. The sensor air gap should be adjusted to .010 - .015 of an
inch. (The thickness of a business card may be used to gauge
the correct distance.) Adjust with vertical screws.
H A L L E F F E C T S E N S O R A D J U S T M E N T
Hall Effect Cable
4-40 Screw (2):
Loosen To Adjust Hall
Effect Board Over Ring Magnet
.010" Between
Magnet And Hall
Effect Board
WARNING
To avoid SERIOUS PERSONAL INJURY or DEATH
DISCONNECT electric power BEFORE adjusting Hall Effect.
CAUTION
Ring Magnet
27