NAS power 1000, Installation Manual, Page: 32 / 45

32
Insert the white wires into the GND terminal on the garage door
opener. Insert the white/red wires into the PB terminal on the
garage door opener.
Ensure the Safety Reversing Sensors are aligned The door will
not close if the sensors have not been installed and aligned
correctly.
When the light beam is obstructed or misaligned while the door is
closing, the door will reverse and the garage door opener lights will
flash three minutes. If the door is already open, it will not close.
Check to make sure the LEDs in both sensors are glowing steadily
.The LEDs in both sensors will grow steadily if they are aligned and
wired correctly.