Figure 5, Glow steadily w, Sending eye – Craftsman 1/2 HP GARAGE DOOR OPENER 139.53978SRT User Manual

Page 23: Receiving eye, Glows steadily, Figure 6 wiring the safety sensors figure 5, Glow steadily e^ex, Glows steadiiydux

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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 wail 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 W

wiring

connections and alignment are correct.

The

sending eye

orange indicator tight 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.

Figure 6 Wiring the Safety Sensors

Figure 5

Wing nut

1/4"-20xl/2'

Carriage boH

Trouble Shooting the Safety Sensors

1. If the

sending eye

indicator light does not

glow

steadily e^ex

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 steadiiyduX

the

receiving eye indicator light doesn't:

• Check alignment.

• Check for a broken wire to the receiving eye.

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

sensor.

NOTE: W hen the invisible beam path is obstructed or
m isaligned while the door is dosing, the door wilt

reverse, if the door is already open, it will not dose. The

opener lights will flash 10 tim es, (if bulbs are not

installed, 10 dicks can be heard.) See page 21.

Bell Wire

' Sensor

Invisible Light Beam

Protection Area