2TLC172287M0201 Rev B 26 www.abb.com/jokabsafety
2015-09-17
6 Alignment procedure
The alignment between the transmitter and the receiver is necessary to obtain the correct functioning of the AOPD. 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 beams of the transmitter coincide with the optical
axes of the corresponding elements of the receiver.
The beam used to synchronise the two units is the one closest to the connector. FIRST is the optics connected with
this beam and LAST is the optics connected to the last beam when starting from FIRST.
Figure 23 – LAST and FIRST optics
It is important to understand the symbols present on the display. The symbols are easily interpreted whatever the
orientation of the AOPD.
Figure 24 – Displays on transmitter and receiver
The standard installation described hereinafter is the one shown in Figure 23, i.e. with the connectors pointing down.
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