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CLUTCH ADJUSTMENT (MODEL SD)
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.
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2
3
4
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4
2
3
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
protection 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 not applicable on model GSD.)
NOTE: This feature is automatically learned and does not require
programming.
L
OSE OPEN
RPM Sensor
Logic Board
Adjustment 15
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2
3
4
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.
Set Screws
Torque Nut
TORQUE LIMITER ADJUSTMENT
(MODEL GSD)
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