11
SLC440 Series
SLG440 Series
Operating instructions
Safety light curtain / safety light grid
EN
Orientation / Alignment
Receiver not parallel
Both sensors parallel
b
a
b
a
Beam (a) = receive signal OK
Beam (b) = no receive signal
Beam (a) and beam (b)
= receive signals OK
Indication basic setting
The signal strength is displayed per beam with two segments for the
2nd (a) and the last (b) beam
Status second beam (a)
Status last beam (b)
2 segments left-hand side = signal strength of the
second
beam (a)
2 segments right-hand side = signal strength of the
last
beam (b)
Signal strength (a) 25% … 50%
Signal strength (b) 0%
Signal strength (a) 50% … 100%
Signal strength (b) 0%
Signal strength (a) 50% … 100%
Signal strength (a) 25% … 50%
Signal strength (a) 50% … 100%
Signal strength (a) 50% … 100%
Inadequate alignment of the sensors
(height offset, not parallel)
Indication fine adjustment
The fine adjustment is displayed by means of up to 3 segments
(crossbars) for the best possible signal strength of all beams
Best possible signal strength
Signal strength for normal operation OK
- Signal strength is sufficient, if one or more beams in the
protection zone are covered (object blanking)
- Signal strength insufficient, when no beams are covered
The availability of the system is also assured if due to soiling
or operation at nominal range the best possible signal
strength (3 segments)is not reached
4.4 Safety distance
The safety distance is the minimum distance between the protection
field of the safety light curtain and the hazardous area The safety
distance must be observed to ensure that the hazardous area cannot
be reached before the hazardous movement has come to standstill
The safety distance between the safety light curtain / light
grid and the hazardous point must always be respected and
observed If a person reaches the hazardous point before the
hazardous movement has come to a standstill, he or she is
exposed to serious injuries
To calculate the minimum distances of the safety guards with
regard to the hazardous point, ISO 13855 and ISO 13857
must be observed
Calculation of the safety distance according to ISO 13855 and
ISO 13857
The safety distance depends on the following elements:
• Stopping time of the machine (calculation by run-on time
measurement)
• Response time of the machine and the safety light curtain and the
downstream relay (entire safety guard)
• Approach speed
• Resolution of the safety light curtain
Calculation of the safety distance for safety light curtains SLC440
The safety distance for resolutions 14 mm up to 40 mm is calculated by
means of the following formula:
(1) S = 2000 mm/s * T + 8 (d - 14) [mm]
S = Safety distance [mm]
T = Total reaction time (machine run-on time, reaction time of the safety
guard, relays, etc)
K = Approach speed
d = Resolution of the safety light curtain
The approach speed is covered with a value of 2000 mm/s
If value S ≤ 500 mm after the calculation of the safety distance, then
use this value
If value S >= 500 mm, recalculate the distance:
(2) S = 1600 mm/s * T + 8 (d - 14) [mm]
If the new value S > 500 mm, use this value as safety distance
If the new value S < 500 mm, use a minimum distance of 500 mm
