Aligning The Safety Reversing Sensors - Chamberlain LiftMaster PROFESSIONAL ATS 211X 1/2 HP Mode D'emploi

MOUNTING AND WIRING THE SAFETY
REVERSING SENSORS
• Center each sensor unit in a "C" wrap with lenses
pointing toward each other across the door
(see Figure 6).
• 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.
• Run the wires from both sensors to the opener
(see Figure 7). 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.

ALIGNING THE SAFETY REVERSING SENSORS

• Plug in the opener. The indicator lights in both the
sending and receiving eyes will glow steadily if
wiring connections and alignment are correct.
The sending eye indicator light will glow regardless of
alignment or obstruction. If the 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 7
Bell Wire
Safety Reversing
Sensor
Finished
Ceiling
Safety Reversing
Invisible Light Beam
Sensor
Protection Area
Figure 6
Indicator
Light
Hex Bolt
1/4-20 x 1-1/2"
TROUBLESHOOTING THE SAFETY
REVERSING 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 opener 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 opener lights will blink 10 times. See page 15.
Bell Wire
17
Wing
"C" Wrap
Nut
Sensor
with Wire
Connect Wire to
Opener Terminals
Wall Control
Connections
(dotted line)
1
2
OPENER TERMINAL SCREWS
Sensor
Connections
3