Manual Liftmaster 1280-298LMC (page 19 of 36) (English)

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Invisible Light Beam

Protection Area

Sensor

Connect Wire to

Opener Terminals

Bell Wire

Finished

Ceiling

OPENER TERMINAL SCREWS

Sensor

Connections

Door Control

Connections

(dotted line)

2 3

Figure 6 Wiring the Safety Sensors

1/4"-20x1/2"

Carriage bolt

Lens

Wing nut

Figure 5

MOUNTING AND WIRING THE SAFETY SENSORS

• Slide a 1/4"-20x1/2" carriage bolt head into the slot

on each sensor. Use wing nuts to fasten sensors to

brackets, with lenses pointing toward each other

across the door. Be sure the lens is not obstructed

by a bracket extension. See Figure 5.

• Finger tighten the wing nuts.

• Run the wires from both sensors to the opener. Use

insulated staples to secure wire to wall and ceiling.

• Strip 1/4" of insulation from each set of wires.

Separate white and white/black wires sufficiently to

connect to the opener terminal screws: white to 2

and white/black to 3.

ALIGNING THE SAFETY SENSORS

• Plug in the opener. The indicator lights in both the

sending and receiving eyes will

glow steadily

wiring connections and alignment are correct.

The

sending

eye orange indicator light will glow

regardless of alignment or obstruction. If the green

indicator light in the

receiving eye

is off, dim, or

flickering (and the invisible light beam path is not

obstructed), alignment is required.

• Loosen the

sending

eye wing nut and readjust,

aiming directly at the receiving eye. Lock in place.

• Loosen the

receiving

eye wing nut and adjust

sensor until it receives the sender’s beam. When

the green indicator light

glows steadily,

tighten the

wing nut.

TROUBLESHOOTING THE SAFETY SENSORS

1. If the

sending eye

indicator light does not

glow

steadily

after installation, check for:

• Electric power to the opener.

• A short in the white or white/black wires. These

can occur at staples, or at screw terminal

connections.

• Incorrect wiring between sensors and opener.

• A broken wire.

2. If the sending eye indicator light

glows steadily

but

the receiving eye indicator light doesn't:

• Check alignment.

• Check for an open wire to the receiving eye.

3.If the receiving eye indicator light is dim, realign

either sensor.

NOTE: When the invisible beam path is obstructed or

misaligned while the door is closing, the door will

reverse. If the door is already open, it will not close.

The door control will blink 10 times. See page 17.

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Liftmaster 1280-298LMC Manual

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