Instruction Manual SG2 BASE275. ALIGNMENT PROCEDUREThe alignment between the emitting and the receiving units is necessary to obtain the correctfunctioning of the light curtain.A good alignment prevents outputs instability caused by dust or vibrations.The alignment is perfect if the optical axes of the first and the last emitting unit’s beams coincide withthe optical axes of the corresponding elements of the receiving unit.The beam used to synchronise the two units is the first after the connector. SYNC is the opticsconnected with this beam and LAST is the optics connected to the last beam after the SYNC unit.Fig.21Signals are clearly identified through symbols allowing immediate reading, independent of barsdirections. A short description of the signalling LEDs is necessary to avoid misunderstandings.Receiver EmitterFig. 22last optics (LAST)first optics = synchronisation optics (SYNC)LASTSYNC ONNORMALOP.SAFE(BREAK)NORMALOP.