LiftMaster SW420 SW420 GL BOARD Manual - Page 18

RPM Sensor (Hall Effect) Adjustment, Normally the RPM sensor hall effect does not need, adjustment

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ADJUSTMENT RPM SENSOR (HALL EFFECT) ADJUSTMENT NOTE: Normally the RPM sensor (hall effect) 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 control board, magnet, and RPM sensor. It may become necessary to adjust the sensor for correct alignment. To do so please perform the following steps: 1. Loosen the two screws holding the hall bracket to the frame. 2. Adjust the bracket so that the sensor is: a. Parallel with the pulley. b. .020" (.051 cm) away from the pulley's magnet. Use a feeler gauge to measure the distance. 3. Tighten screws to secure assembly. 4. Manually rotate pulley to ensure that each magnet clears the sensor board. If a magnet does not clear the board, re-adjust the RPM (hall effect) assembly accordingly. WARNING To reduce the risk of SEVERE INJURY or DEATH: CAUTION • Disconnect power BEFORE performing ANY adjustments. AVERT AVERT ATTEN Cable Operator Chassis Mounting Screws (2) Bracket Pulley Magnet AVER Pulley ADVERTENCIA PRECAUCIÓN 18

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18
RPM SENSOR (HALL EFFECT) ADJUSTMENT
NOTE:
Normally the RPM sensor (hall effect) 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 control board, magnet, and RPM
sensor. It may become necessary to adjust the sensor for correct
alignment. To do so please perform the following steps:
1.
Loosen the two screws holding the hall bracket to the frame.
2.
Adjust the bracket so that the sensor is:
a. Parallel with the pulley.
b.
.020" (.051 cm) away from the pulley’s magnet. Use a
feeler gauge to measure the distance.
3.
Tighten screws to secure assembly.
4.
Manually rotate pulley to ensure that each magnet clears the
sensor board.
If a magnet does not clear the board, re-adjust the RPM
(hall effect) assembly accordingly.
ADJUSTMENT
To reduce the risk of SEVERE INJURY or DEATH:
•
Disconnect power BEFORE performing ANY adjustments.
WARNING
WARNING
Cable
Operator Chassis
Mounting
Screws (2)
Bracket
Pulley
Magnet
Pulley