FAQs – Questions and Answers

This section provide answers to the most frequently asked questions about products and applications.

What to do when the light curtain does not work and the meaning of the LEDs does not allow to identify the fault?

After shutting down and restarting the system:

  • check the integrity and fairness of the electrical connections;-check that the power supply voltage levels conform to those indicated in the technical data;
  • check that any relay or external contactors are used correctly and with adequate suppression modules indicated by the manufacturer;
  • check that the projector and receiver are correctly aligned and that the optics are clean;
  • check the working distance (vapors or fumes may cause occasional occupations for use at maximum flow rate);
  • check that the barrier is not subjected to vibrations (momentary loss of alignment);
  • check that there are no two or more users who work near or alongside and a receiver cannot “see other projectors” in addition to its own;
  • check that the barrier is not placed near reflective surfaces (e.g. transparencies or sheet metal panels);
  • Verify that all elements of the system have a good grounding;

If the suggested controls are not sufficient to restore the proper functioning of the system, send the appliance to our laboratories, complete with all its parts, indicating with clarity:

  • serial number;-date of purchase;
  • period of operation;
  • type of installation;
  • fault detected.

How high, compared with to reference plane, it must be the first beam of the light curtains?
What is the selection criterion to determine the number of the beams of the light curtains?

Here below there are three examples of palletizers where the safety light curtains are positioned:

For each of these conditions the EN 415-19 defines:

  • How high must be positioned the first beam of the light curtain
  • The number of beams of the same light curtain.

When the opening includes the floor or an easily accessible platform as in follow example, the AOPDs must have at least 3 beams positioned at 300mm, 700mm and 1100mm from the access plane.

Positioning of the AOPD – General

When the opening is on a conveyor, the AOPDs must have at least 2 beams positioned at 400mm and 900mm from the conveyor plane.

Positioning of the AOPD – Above the roller conveyor

The safety distance must be calculated using the formula:

S = 1600 x T + 850 (see ISO 13855: 2010)

If it is possible to reach the dangerous point by leaning over the edge of the higher beam then the following formula must be used:

S = 1600 x T + Cro
(Where Cro comes from Table 1 of ISO 13855: 2010)

Or an ESPE with a larger number of beams must be selected.

Using mechanical obstacles

To prevent a person from crawling below the lower beam and reaching the dangerous area without being intercepted by the AOPD, mechanical obstacles can be used

Indicazioni dei Led presenti sulle barriere
Che significato hanno i LED sulle barriere di sicurezza Famiglia EOS4?
  • Barriere di sicurezza ADMIRAL – Significato dei LED (Ita, Eng)
  • Barriere di sicurezza ADMIRAL AX – Significato dei LED (Ita, Eng)
  • Barriere di sicurezza ADMIRAL AX BK – Significato dei LED (Ita, Eng)
Che significato hanno i LED sulle barriere di sicurezza Famiglia ADMIRAL?
  • Barriere di sicurezza ADMIRAL – Significato dei LED (Ita, Eng)
  • Barriere di sicurezza ADMIRAL AX – Significato dei LED (Ita, Eng)
  • Barriere di sicurezza ADMIRAL AX BK – Significato dei LED (Ita, Eng)
Che significato hanno i LED sulle barriere di sicurezza Famiglia JANUS?
Che significato hanno i LED sulle barriere di sicurezza Famiglia EOS2?
Che significato hanno i LED sulle barriere di sicurezza Famiglia VISION?