Install The Protector System - Chamberlain Liftmaster Security+ 3900PLD Owner's Manual

INSTALLATION STEP 9

Install The Protector System

The safety reversing sensor must be connected and
aligned correctly before the door operator will move in
the down direction. This is a required safety device
and cannot be disabled.
IMPORTANT INFORMATION ABOUT THE SAFETY
REVERSING SENSOR
When properly connected and aligned, the safety
reversing sensor will detect an obstacle in the path of its
electronic beam. The sending eye (with an amber indicator
light) transmits an invisible light beam to the receiving eye
(with a green indicator light). If an obstruction breaks the
light beam while the door is closing, the door will stop and
reverse to full open position, and the operator lights will
flash 10 times.
The units must be installed inside the building so that the
sending and receiving eyes face each other across the
door, no more than 6" (15 cm) above the floor. Either can
be installed on the left or right of the door as long as the
sun never shines directly into the receiving eye lens.
The mounting brackets are designed to clip onto the track
of sectional doors without additional hardware.
Safety Reversing Sensor
6" (15 cm) max. above floor
Facing the door from inside the garage
®
If it is necessary to mount the units on the wall, the
brackets must be securely fastened to a solid surface such
as the wall framing. Extension brackets (see accessories)
are available if needed. If installing in masonry
construction, add a piece of wood at each location to
avoid drilling extra holes in masonry if repositioning is
necessary.
The invisible light beam path must be unobstructed. No
part of the door (door tracks, springs, hinges, rollers or
other hardware) may interrupt the beam while the door is
closing.
Invisible Light Beam
Protection Area
14
Be sure power is not connected to the door operator BEFORE
installing the safety reversing sensor.
To prevent SERIOUS INJURY or DEATH from a closing door:
• Correctly connect and align the safety reversing sensor. This
required safety device MUST NOT be disabled.
• Install the safety reversing sensor so beam is NO HIGHER
than 6" (15 cm) above floor.
Safety Reversing Sensor
6" (15 cm) max. above floor