Safety Reverse System; Adjustment - Chamberlain Merlin Professional MT230 Installation And Operating Instructions Manual

19
SETTING THE FORCE SENSITIVITY
The Protector System
installations where the closing force as
measured on the bottom of the door is over
400N (40kgf).
The force, as measured on the closing edge of the door,
should not exceed 400N (40kgf). If the closing force is
measured to more than 400N, The Protector System
be installed (refer section 21). The force setting regulates
the amount of power required to open and close the door.
This procedure requires the door to be engaged (see
section 14) and run through one full cycle of operation.
Step 1: Start with the door in the fully open position and the
green control panel cover should be removed (see fig 1
section 22). Press the red "learn" button twice on the con-
trol panel to enter into the force learn mode. The amber
LED marked open on the control panel will flash quickly.
Step 2: Press the green operate button on the control
panel. The door will travel to the DOWN limit. Press the
operate button again, the door will travel to the UP limit. The
amber LED marked open on the control panel will stop
flashing when the force has been learnt.
20
TEST THE SAFETY REVERSE SYSTEM
The safety reverse system test is important. The garage door must reverse on contact with a 40mm
obstacle laid flat on the floor. Failure to properly adjust opener may result in serious personal injury
from a closing garage door.
Procedure: Place a 40mm obstacle (1) laid flat on the floor under the garage door. Operate the door in the down direc-
tion. The door must reverse on the obstacle. If the door stops on the obstacle, it is not travelling far enough in the down
direction. Remove the lamp cover to locate the travel limit adjustment screws. Increase the down limit by turning down
limit adjustment screw clockwise (1 turn = approximatly 250mm travel). Repeat test.
When the door reverses on the 40mm obstacle, remove the obstacle and run the opener through a complete travel
cycle. Door must not reverse in closed position. If it does, adjust Limits and Force and repeat safety reverse test.
40mm
Repeat test once a month and adjust as needed.
must be used for all
TM
must
TM
1
operate
learn
x2
close
open
operate
learn
open
12
Press learn
button twice
LED will start flashing
Press OPERATE
button (door will close)
Press OPERATE
button to open the
door
LED will turn off
1
40mm