Rockwell Automation 442L SafeZone Singlezone & Multizone Safety Laser Scanner - Manual (Page 25)

R
SafeZone™ Safety Laser Scanner User Manual
10000073050, July 2011 23
Original instructions
The safety distance S as defined in EN 999 and EN 294
depends on:
• Reach or approach speed
• Stopping/run-down time of the machine or system
(The stopping/run-down time is shown in the machine
documentation or must be determined by taking a measurement.
On request Rockwell safety services can perform a detailed stopping/
run-down measurement on your equipment.)
• Response time of the SafeZone safety laser scanner
• Supplement C against reaching through
Calculation of the safety distance S:
² First, calculate S using the following formula:
S = (K x (T
M
+ T S )) + C
Where...
Response time T S of the SafeZone safety laser scanner
The response time TS of the SafeZone safety laser scanner depends on
• The multiple sampling used.
• The transmission speed to external OSSDs over communication lines.
See Section 11.2 “OSSD response times” on page 42.
4.3 Stationary vertical operation for
hazardous point protection
Hazardous point protection is necessary if the operator must remain near
the dangerous state of the machine. Hand protection must be released for
hazardous point protection.
• To protect the protective device against inadvertent adjustment or
manipulation, use the contour of the surroundings as a reference for
the SafeZone safety laser scanner (see Section 3.4.3 “Using the
contour of the protective safety field as a reference” on page 12).
4.3.1 Safety distance
For hazardous point protection, a safety distance must be observed
between protective safety field and hazardous point. This safety distance
ensures that the hazardous point can only be reached after the dangerous
state of the machine has been completely stopped.
You can operate the SafeZone multizone safety laser scanner with 30 mm
or 40 mm resolution for hazardous point protection. At each resolution
you can choose a response time between 60 ms and 120 ms (due to the
proximity of the hazardous point in the majority of cases only the shorter
response time can be used). The maximum protective safety field range
and the minimum distance to the hazardous point is given by the
resolution and the response time.
• If you choose 30 mm resolution, the protective safety field that can be
configured is smaller (for smaller hazardous points to be protected),
however you can mount the SafeZone multizone safety laser scanner
nearer to the hazardous point.
• If you choose 40 mm resolution, the protective safety field that can be
configured is larger (thus for larger hazardous points to be protected),
however you must mount the SafeZone multizone safety laser scanner
further away from the hazardous point.
K = Approach speed (1600 mm/s, defined in EN 999)
T
M
= Stopping/run-down time of the machine or system
T
S
= Response time of the SafeZone multizone safety laser scanner
C = Supplement against reaching through (850 mm)
ATTENTION The overall response time of the
SafeZone safety laser scanner must not
be more than 90 ms for access
protection.
If a critical response time is exceeded (for
an object diameter of 150 mm and a
speed of 1.6 m/s that is 90 ms) a person
may no longer be detected under
certain circumstances. The critical
response time is exceeded if the basic
response time is too high, possibly due
to multiple sampling or due to the
usage of external OSSDs.
In specific cases agreed with the
responsible authorities higher response
times may be allowed (for example by
increasing the detection time available
by positioning the scanner at an angle).
In this case ensure that the areas the
scanner cannot see are protected by
additional measures.
IMPORTANT To provide hand protection with
hazardous point protection a
resolution of at least 40 mm is required.
The SafeZone multizone safety laser
scanner provides a maximum
resolution of 30 mm.
ATTENTION Never use the SafeZone safety laser
scanner for applications in which finger
protection is required
Due to the maximum resolution of 30
mm, the SafeZone safety laser scanner
is not suitable for finger protection.
ATTENTION Danger due reaching around or
reaching behind.
Always mount the scanner such that
reaching around and behind is
impossible. Provide suitable additional
precautions as necessary.