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Safety clearance to hazard zones (EN 999 / ISO 13855)
Vertical safeguarding of hazard zones with light curtains
(valid to a resolution of 40 mm)
The safety clearance S is calculated as follows:
K = Gripping or approach speed
The gripping speed K is assumed as being 2000 mm/s. If a value of more
than 500 mm is calculated for S, the calculation can be repeated with
1600 mm/s provided that the result for S here is at least 500.
(S min
≥
100 mm)
T = t1 + t2
t1 = Protective mechanism's reaction time
In the case of the ULCT / BLCT light curtains, the protective mechanism's
reaction time t1 depends on the beam count (see the table on Page 11).
If optional safety switching devices are used, the the reaction times stated stated next are added to the reaction time t1:
PLSG:
3,5 ms
ULSG / BPSG:
6 ms.
t2 = Machine's run-on time
The machine's run-on time t2 must be specified by the manufacturer.
C = 8 (d -14 mm)
d = Protective mechanism's resolution (minimum detectable obstruction size)
.
The resolution d is stated in the type plate of the ULCT light curtain.
At d = 14 mm, C = 0 mm
At d = 30 mm, C = 128 mm
Sample calculations of safety clearance: Valid to a resolution of 40 mm
Example 1
:
Safety light curtain ULCT100/12
- Reaction time 5 ms,
- Resolution d = 14 mm,
- Machine run-on time t2 = 75 ms
Example 2
:
Safety light curtain ULCT500/20
- Reaction time 6 ms,
- Resolution d = 30 mm,
- ULSG reaction time = 6 ms
- Machine run-on time t2 = 75 ms
12
2
Assembly
2.2
Safety clearance
S = (K x T) + C
At S = 100 mm to 500 mm:
At S > 500 mm:
S = (2000 mm / s . T) + C
S = (1600 mm / s . T) + C
The clearance S between the safety light curtain and the hazard zones must be large enough to stop the machine
before any of its components can reach a hazard zone following penetration of the protective field.
Additional mechanical barriers and light curtains must be installed to prevent access over, under, around and behind
the protective field. In this context, also refer to EN 999 / ISO 13855 and other relevant national / international safety
regulations.
S
Nachlaufweg
der Maschine
Fig. 12/1 Vertical safeguarding of hazard zones
Table of Contents
S = 2000 mm/ s x (0,075 s +0,005 s)
S =160 mm
S = 2000 mm/ s x (0,075 s + 0,006 s + 0,006 s) + 8x (30 mm-14 mm)
S = 302 mm
FIESSLER
E L E K T R O N I K
Machine's
run-on path
Fiessler Elektronik GmbH & Co. KG
Telefon: +49 (0) 711 / 91 96 97-0 Internet: http://www.fiessler.de
Telefax: +49 (0) 711 / 91 96 97-50 eMail: [email protected]
Doku Nr. 1121 Stand 08.01. 2018 RK/Aui