Leuze electronic MLC 520 EX Series User Manual

Mounting
Leuze electronic MLC 530 34
tance for access guarding for resolutions > 40 mm: C
RT
= 850 mm (standard value for
arm length)
Calculation example
Access to a robot with a stopping time of 250 ms is to be safeguarded with a Safety Light Curtain with
90 mm of resolution and 1500 mm of protective field height whose response time is 6 ms. The Safety Light
Curtain directly switches the contactors whose response time is contained in the 250 ms. An additional
interface therefore does not have to be taken into consideration.
 Calculate safety distance S
RT
using the formula acc. to EN ISO 13855.
K [mm/s] = 1600
T [s] = (0.006 + 0.250)
C
RT
[mm] = 850
S
RT
[mm] = 1600 mm/s  0.256 s + 850 mm
S
RT
[mm]= 1260
This safety distance is not available in the application. This is why a new calculation is done with a Safety
Light Curtain with 40 mm of resolution (response time = 14 ms):
 Re-calculate safety distance S
RT
using the formula acc. to EN ISO 13855.
K [mm/s] = 1600
T [s] = (0.014 + 0.250)
C
RT
[mm] = 8  (40 - 14)
S
RT
[mm] = 1600 mm/s  0.264 s + 208 mm
S
RT
[mm]= 631
The Safety Light Curtain with a 40 mm resolution is thus suitable for this application.
Calculation of safety distance S
RO
acc. to EN ISO 13855 when protective field is accessed from above:
Calculation of safety distance S
RT
for point of operation guarding
S
RO
[mm] = Safety distance
K [mm/s] = Approach speed for point of operation guarding with approach reaction and normal ap-
proach direction to the protective field (resolution 14 to 40 mm): 2000 mm/s or
1600 mm/s, when S
RO
> 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
RO
[mm] = Additional distance in which a body part can move towards the protective device before
the protective device triggers: value (see table 6.1)
For the calculation with K = 2000 mm/s, safety distance S
RT
equals 736 mm. The adoption of ap-
proach speed K = 1600 mm/s is therefore permitted.

Leuze electronic MLC 520 EX Series Specifications

General

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