Chamberlain Group Inc The 1D8075 Manuel D’Utilisation

 23

Remove the cotter pin from the clutch nut on the clutch shaft.

Turn the clutch nut to release tension.

Re-tighten the clutch nut until there is just enough tension 
to permit smooth operation of the door and to allow the 
clutch to slip if the door is obstructed.

Secure the clutch nut with the cotter pin.

Adjustment

To avoid SERIOUS personal INJURY or DEATH from 
electrocution:
•  Disconnect electric power BEFORE performing ANY 

adjustments or maintenance.

AUXILIARY REVERSAL SYSTEM / RPM SENSOR
The Auxiliary Reversal System is designed to protect the door and 
motorized operator. It is NOT a substitute for an entrapment 
sensing device.
Feature: This feature utilizes the RPM sensor connected to the logic 
board to detect when the clutch slips and reverses the door (clutch 
must be properly adjusted). In addition, the RPM eliminates the 
need for a centrifugal switch on single phase motors.
Benefit: The Auxiliary Reversal System reverses the operator upon 
hitting an obstruction, preventing excessive door and operator 
damage. UL325 requires the use of monitored entrapment 
protection devices for primary entrapment protection. By removing 
the centrifugal switch on single phase motors, the leading cause of 
motor failures is eliminated. (Auxiliary Reversal System is not 
applicable on GH models unless the clutch modification is 
installed.)
NOTE: This feature is automatically learned and does not require 
programming.

RPM Sensor

Logic Board

Loosen set screws on clutch nut.

 Back off clutch nut until there is very little tension on the 
clutch spring.

Tighten clutch nut gradually until there is just enough tension 
to permit the operator to move the door smoothly but to allow 
the clutch to slip if the door is obstructed. When the clutch is 
properly adjusted, it should generally be possible to stop the 
door by hand during travel.

  Loosen set screws of torque adjustment nut on the gear  

 

 reducer.

Back off torque nut until there is very little tension on the
belleville washers.

Tighten torque nut gradually until there is just enough tension
to permit the operator to move the door smoothly through a
complete open/close cycle, but to allow the reducer to slip if
the door is obstructed.

Re-tighten the set screw that is directly over the flat portion 
of the shaft.

(3) Set Screws

Set Screws

Torque Nut