May 22, 2023
EZ-SCREEN SLS Safety Light Curtain Instruction Manual
23
Ds = K × (Ts + Tr) + Dpf
Ds
the Safety Distance, in inches
K
1600 mm per second (or 63 in per second), the OSHA
29CFR1910.217, and ANSI B11.19 recommended hand-
speed constant (see Note 1 below)
Ts
the overall stop time of the machine (in seconds) from the ini-
tial stop signal to the final ceasing of all motion, including stop
times of all relevant control elements (for example, IM-T-.. In-
terface Modules) and measured at maximum machine velocity
(see Note 3 below)
Tr
the maximum response time, in seconds, of the
EZ-SCREEN
SLS
emitter/receiver pair (depending on model)
Dpf
the added distance due to the depth penetration factor as pre-
scribed in OSHA 29CFR1910.217, and ANSI B11.19 for U.S.
applications. See Depth Penetration Factor (Dpf) table below
or calculate using the formula (in mm): Dpf = 3.4 × (S - 7)
where S is the resolution of the light curtain (for S ≤ 63 mm).
European Applications
—The Minimum Distance formula for European applications:
S = (K × T) + C
S
the Minimum Distance, in mm, from danger zone to light
screen center line; minimum allowable distance is 100 mm
( 175 mm for non-industrial applications), regardless of calcu-
lated value
K
hand-speed constant (see Note 2 below); 2000 mm/s (for Min-
imum Distances
<
500 mm)
1600 mm/s
(for Minimum Dis-
tances > 500 mm)
T
the overall machine stopping response time (in seconds), from
the physical initiation of the safety device and the machine
coming to a stop (or the hazard removed). This can be broken
down into two parts:
Ts
and
Tr
where
T
=
Ts
+
Tr
C
the additional distance, in mm, based on intrusion of a hand or
object towards the danger zone prior to actuation of a safety
device. Calculate using the formula (in mm):
C = 8 × (d - 14)
where
d
is the resolution of the light curtain (for
d
≤ 40 mm).
Reduced Resolution
Depth Penetration Factor (Dpf)
14 mm Systems
30 mm Systems
OFF
24 mm (1 in)
78 mm (3 in)
ON
78 mm (3 in)
180 mm (7 in)
Notes:
Depth Penetration Factor (Dpf)
Table 1.
The OSHA-recommended hand speed constant
K
has been determined by various studies and, although these stud-
ies indicate speeds of 1600 mm/sec. (63 in/sec.) to more than 2500 mm/sec. (100 in/sec.), they are not conclusive
determinations. Consider all factors, including the physical ability of the operator, when determining the value of
K
to
be used.
1.
The recommended hand speed constant
K, derived from data on approach speeds of the body or parts of the body as
stated in ISO 13855.
2.
Ts
is usually measured by a stop-time measuring device. If the machine manufacturer's specified stop time is used, at
least 20% should be added to allow for possible clutch/ brake system deterioration. This measurement must take into
account the slower of the two MPCE channels, and the response time of all devices or controls that react to stop the
machine.
3.
© Banner Engineering Corp.
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