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DUO-TOUCH
Example Minimum Safety Distance
(S) Calculation
The following example illustrates the
use of the formula to calculate the
minimum safety distance:
K = 1600 mm per second
T
= 0,055 seconds
1
T
= 0,50 seconds (measured by a
2
stop-time measuring device)
C = 250 mm
S = K x T + C (where T = T
= 1600 x (0,055 + 0,50) + 250
= 1138 mm
In this example, both hand controls
must be located no closer than
1138 mm from the nearest hazard
point.
WARNING
...
!
Location of Touch
Button Controls
Hand controls must be mounted a safe
distance from moving machine parts. It
must not be possible for the operator or
other non-competent persons to relocate
them. Failure to establish and maintain
the required safety distance could result
in serious injury or death.
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
SG –
Two-Hand-Control Kits with STB Touch Buttons
EN 999/ISO 13855 – Safety of Machinery – The positioning of protective equipment in
respect of approach speeds of parts of the human body.
Both hand controls must be located far enough away from the nearest hazard point
that the operator cannot reach the hazard with a hand or other body part before the
hazardous motion ceases. If no appropriate Type-C standard exists then the minimum
distance shall be calculated using the general formula.
General Formula
S = K x T + C where:
S is the minimum safety distance in millimetres, from the danger zone to the
detection point, line or plane;
K is a constant in millimetres per second, derived from data on approach speeds of
the body or part of the body: K = 1600 mm per second;
T is the overall response time in seconds;
C is and additional distance in millimetres, based on intrusion towards the danger
+ T
)
1
2
zone prior to actuation; C = 250 mm.
Where machine specific European standards specify a different distance than the
safety distance calculated using this standard then the greater of the distances shall
be used as the minimum safety distance.
Note: Overall response time is the time between the physical initiation of the safety
device and the machine coming to a stop or the risk being removed. The overall
response time comprises a minimum of two phases:
T = T
1
T
is the maximum response time of the safety device between the physical
1
initiation of the sensing function and the output signal switching devices being in
the OFF state.
The DUO-TOUCH SG Safety Kit (AT-FM-10K Safety Module interfaced with STB Touch
Buttons) has an output response time of 55 milliseconds.
T
is the response time of the machine, that is the time required to stop the
2
machine or remove the risk after receiving the output signal form the safety
device.
Note: If the risk from encroachment of the body or part of the body towards the
danger zone is eliminated while the device is being actuated, e.g. by adequate
shrouding, then C may be zero, with a minimum allowable distance for S of 100 mm.
Minimum Safety Distance
+ T
where:
2
7
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