Product description
28
© SICK AG · Germany · All rights reserved · Subject to change without notice
8013889/ZML0/2017-06-09
Operating Instructions
NAV350 Laser positioning sensor
Chapter
3
Reduction of the action radius
The parameters for the minimum and maximum radius are set using a software telegram
from the vehicle computer. During this process it must be ensured that from every position
of the NAV350 at least 3 reflectors are visible within the restricted action radius. If, e.g.,
there are only 2 reflectors within the restricted action radius, the NAV350 switches auto-
matically to the full action radius.
The example in
fig. 13
shows a defined, restricted action radius with the parameters
r
min
= 500 mm (19.69 in) and r
max
= 15,000 mm (590.55 in) in which the NAV350 is de-
tecting five reflectors.
Sector muting
In certain applications it can be desirable to mute certain angular segments (sectors) within
the 360° scan range of the NAV350, e.g. if individual reflectors are partially obscured by a
raised load and therefore it is not possible to exactly determine the middle of the reflectors.
This situation can result in reduced accuracy during the position determination.
The NAV350 does not use any measurements from reflectors that are in completely or par-
tially muted sectors for the position determination.
The muted sectors are set in the
NAVIGATION
operating mode. The sector muting is then active
for the following position request. However, the setting cannot be saved.
Important
The reflector layout is to be designed such that for the NAV350 at least three reflectors are
always visible in the sectors that are not muted.
If this is not the case, the NAV350 determines the position using all visible reflectors (similar
to the measuring accuracy, see
section 3.7.2 “Measuring accuracy” on page 27
) and out-
puts this condition in the
DIAGNOSTICS
INFORMATION
part of the telegram in the reply to the next
position request (see “NAV350 Telegram listing”, part
no.: 8013893).
The limits for the muted sectors are stated as mathematically positively angles in mdeg. Up
to 4 sectors are possible. The sectors are not allowed to overlap and the starting angle must
be defined in ascending order that starts with a value
≥
0.
