Chamberlain door opener - Manual (Page 23)

23
MAXIMUM RUN TIMER (MRT)
Feature: The operator can learn the time it takes to open or close
the door plus an additional 10 seconds.
Benefit: If the operator does not meet its open or close limit
within the set time it will stop, limiting damage to the door and
operator.
To Program:
NOTE: The default setting for the MRT is 90 seconds. In the event
the application requires the MRT be manually learned for a longer
duration follow steps below.
1. Start with the door in the closed position.
2. Set the selector dial to “PROGRAM”.
3. Press MRT button on logic board.
4. Press the OPEN button and wait for the door to reach the full
open limit.
5. Once the door has reached the open position, programming
is complete.
6. Turn dial to desired wiring type.
NOTE: To reset MRT only, turn selector dial to program and press
and hold the MRT button until the MAS led flashes rapidly.
Operation will vary
depending on
wiring type
SELECTOR DIAL
AUXILIARY REVERSAL SYSTEM / RPM SENSOR
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 1/3 and 1/2
horsepower single phase motors.
Benefit: The Auxiliary Reversal System reverses the operator
upon hitting an obstruction, preventing excessive door and
operator damage. We require the use of safety devices for
primary safety protection. By removing the centrifugal for 1/3 and
1/2 horsepower single phase motors, the leading cause of motor
failures is eliminated. (Auxiliary Reversal System not applicable
on models GH and GT.)
NOTE: This feature is automatically learned and does not require
programming.
LOSE OPEN
RPM Sensor
Logic Board
A U T O M A T I C A L L Y L E A R N E D P R O G R A M M I N G