LiftMaster 773E Mode D'emploi page 4

1
FUNCTION
The 773E is a photoelectric barrier, comprising a transmitter (TX)
and a receiver (RX). It has a potential-free NC contact (standard). If required, this
can be modified to a NO contact (optional, see point 4).
An interruption of the infrared beam is detected and transmitted to the controller.
A perfectly functioning photocell serves only to identify persons or objects
in the door area and does not ensure absolute safety from other hazards
arising from the door movement. If necessary, take additional protective
measures.
2
ASSEMBLY
For the protection of young children, the photocell should not be installed
higher than 200 mm - 250 mm above the garage floor.
Attention:
- Installations on slopes or slanted driveways require very precise work.
- Avoid cable lengths of more than 10 m.
- Low angle sunshine or under-sized cables can greatly reduce the range.
- If 2 photocells are installed close to each other with little distance between them
(e.g. for sliding doors), the receiver and transmitter should not be mounted on
the same side of the entrance, or else one transmitter (TX) can influence both
receiver lenses.
Before installing the photocell, the power supply must be shut down.
1. Press in the latch with a suitable screwdriver and open the housing (Fig. 1).
This snap mechanism enables quick installation. Keep the housing open during
the installation so that the diagnosis of the LED can be seen.
2. Mount and align transmitter and receiver accordingly. Use at least 2 screws for
attaching the transmitter and receiver, and ensure that the cable routing is exe-
cuted properly (Fig. 6). Align the sensors in such a way that the lenses precise-
ly face each other parallel to the door. There is a bracket for the lens inside the
773E, which enables an optional alignment (Fig. 3b). After alignment, tighten
the two screws (8) (Fig. 7).
3. The connection cable must be laid in accordance with local building and electri-
cal regulations. High and low voltage lines are not to be laid together in a single
cable; it leads to malfunction.
4. Connect the cable (min. 2 x 0.5 mm2) to the terminals according to the
controller.