Leuze electronic MLC 520 EX Series Safe Implementation And Operation

Mounting
Leuze electronic MLC 510 19
NOTICE
If longer stopping times are determined during regular inspections, an appropriate additional
time must be added to t
m
.
6.1.2 Calculation of safety distance if protective fields act orthogonally to the approach direction
With vertical protective fields, ISO13855 differentiates between
• S
RT
: safety distance concerning access through the protective field
• S
RO
: safety distance concerning access over the protective field
The two values are distinguished by the way additional distanceC is determined:
• C
RT
: from a calculation formula or as a constant (see chapter 6.1.1 "Calculation of safety distanceS")
• C
RO
: from the following table “Reaching over the vertical protective field of electro-sensitive protective
equipment (excerpt from ISO13855)”
The larger of the two values S
RT
and S
RO
is to be used.
Calculation of safety distanceS
RT
acc. to ISO13855 when access occurs through the protective
field:
Calculation of safety distanceS
RT
for point of operation guarding
S
RT
[mm] = Safety distance
K [mm/s] = Approach speed for point of operation guarding with approach reaction and normal approach di-
rection to the protective field (resolution 14to40mm): 2000mm/s or 1600mm/s, when
S
RT
>500mm
T [s] = Total time of the delay, sum from (t
a
+t
i
+t
m
)
t
a
[s] = Response time of the protective device
t
i
[s] = Response time of the safety relay
t
m
[s] = Stopping time of the machine
C
RT
[mm] = Additional distance for point of operation guarding with approach reaction with resolutions of
14to40mm, d=resolution of protective device C
RT
=8×(d-14)mm
Calculation example
The feeding-in area in a press with a stopping time (including press Safety PLC) of 190ms is to be safe-
guarded with a safety light curtain with 20mm of resolution and 1200mm of protective field height. The
safety light curtain has a response time of 22ms.
Ä Calculate safety distanceS
RT
using the formula acc. to ISO13855.
K [mm/s] = 2000
T [s] = (0.022+0.190)
C
RT
[mm] = 8×(20-14)
S
RT
[mm] = 2000mm/s×0.212s+48mm
S
RT
[mm] = 472
S
RT
is smaller than 500mm; this is why the calculation may not be repeated with 1600mm/s.
NOTICE
Implement the stepping behind protection required here, e.g., through the use of an additional or
cascaded safety sensor for area protection.

Leuze electronic MLC 520 EX Series Specifications

General

Brand	Leuze electronic
Model	MLC 520 EX Series
Category	Lighting Equipment
Language	English