Maximum Run Timer (Mrt); Optional Programming; Red/Green Warning Light Card - Chamberlain J Owner's Manual

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

MAXIMUM RUN TIMER (MRT)

Feature: The operator will learn the distance it takes to open or
close the door plus approximately 12 - 14".
Benefit: If the operator does not meet its open or close limit
within the set distance 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 control 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.

RED/GREEN WARNING LIGHT CARD

Feature: The Red/Green warning light card flashes a warning light
for 10 seconds prior to the Timer to Close activating the door to
close.
Benefit: Advanced warning of the door closing helps prevent
traffic collisions with the door.
Light Control Module Operation: The green lights on the OPTION
BOARD will turn on if the board is seated properly and the power
is on. When the door reaches the full open position, the timer
circuit and the green lamp holder will be activated. (Green lamp
will not be activated if timer setting is less than 10 seconds.) The
red lamp holder will receive power as indicated at right.
Requirements: Must have the LiftMaster Red/Green warning light
kit #1A6188 and must have at least one of the following safety
devices attached: CPS-L, CPS-LN4. See Red/Green warning light
instructions for further details.
O P T I O N A L P R O G R A M M I N G
22
Operation will vary
depending on
wiring type
TIMER SETTING RED LAMP HOLDER RECEIVES POWER
Timer setting equals Activates when the door closes and until
zero close limit is activated
Greater than 10 10 seconds before door starts to close
seconds and until close limit is activated
Less than or equal to Activates when the door reaches the
10 seconds open limit
The red lamp holder receives power
when the door opens and remains
activated if the door is stopped manually
before reaching the mid stop or the
open limit
SELECTOR DIAL