Chamberlain 1270LMC - Manual (Page 19)

"C" Wrap Wire
Wing Nut
Invisible Light Beam
Protection Area
Sensor
Sensor
Connect Wire to
Opener Terminals
Bell Wire
Bell Wire
— Finished Ceiling —
OPENER TERMINAL SCREWS
Sensor
Connections
Wall Control
Connections
(dotted line)
1 2 3
• Run paired wires from both sensors to the opener.
Use insulated staples to secure the 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.
• Plug in the opener. Make sure the Lock Feature is
off. Green indicator lights in both the sending and
receiving eyes will
glow steadily if wiring
connections and alignment are correct.
If the indicator light is off in the receiving eye (and
the invisible light beam path is not obstructed),
alignment is required.
• Loosen the receiving eye wing nut to allow slight
rotation of unit. Adjust sensor vertically and/or
horizontally until the green indicator light
glows
with a steady light.
• When indicator lights are glowing steadily in both
units, tighten the wing nut in the receiving eye unit.
19
Push connector in
until you hear a click
Tab should be
flush with back
of connector
• Insert the wire connector into each
sensor and push until you hear a
click, Figure 7. The white tab on the
sensor should be flush with the
back of the connector.
Wire Connector
White Tab
Safety Sensor
Trouble Shooting
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 under staples or at screw terminal
connections.
• Incorrect wiring between sensors and opener.
• An open wire (wire break).
• Lock switch on Multi-Function Door Control Panel
is on. Turn it off.
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.
1/4-20x1-1/2"
Hex Bolt
Wing Nut
Hardware Shown Actual Size
1/4-20x1-1/2"
Hex Bolt
"C" Wrap Wire
Sensor
Wing Nut
Indicator Light
• Center each sensor unit in a "C" wrap with lenses
pointing toward each other across the door.
• Secure sensors with the hardware shown. Finger
tighten the wing nut on the receiving eye to allow
for final adjustment. Securely tighten the sending
eye wing nut.
Figure 7
Figure 8