Rockwell Automation 442L SafeZone Singlezone & Multizone Safety Laser Scanner - Manual (Page 22)

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SafeZone™ Safety Laser Scanner User Manual
20 10000073050, July 2011
Original instructions
You can operate the SafeZone safety laser scanner in stationary horizontal
operation with 50 mm or with 70 mm resolution. For each resolution you
can choose between 60 ms and 120 ms response time. The maximum
protective safety field range for the SafeZone safety laser scanner is given by
the resolution and the response time.
• If you choose a 50 mm resolution, the maximum protective safety field
range is less than for a 70 mm resolution, however you can mount the
SafeZone safety laser scanner as low as required.
• If you choose a 70 mm resolution, you can configure the largest
protective safety field range (5 m) but must position the scan plane of
the SafeZone multizone safety laser scanner at 300 mm.
² Perform your protective safety field calculation initially based on a
resolution of 50 mm and a basic response time of 60 ms.
² If the calculated protective safety field is larger than the maximum
protective safety field range at 50 mm resolution, calculate it again using
the same resolution and the higher response time.
² If the protective safety field calculated is larger than the maximum
protective safety field range achievable, then re-calculate the protective
safety field with the lower resolution.
The safety distance S depends on:
• Approach speed of the body or parts of the body
• 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.)
• Response time of the SafeZone safety laser scanner
• Supplements for general measurement errors and any measurement
errors related to reflection
• Supplement for prevention of reaching over
• Height of the scan plane
• Possibly the time for switching between the monitoring cases
Calculation of the safety distance S:
² First, calculate S using the following formula:
S = (K x (TM + TS )) + ZG + ZR + C
Where...
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
combined with the downstream controller
Z
G
= General safety supplement = 100 mm
Z
R
= Supplement for measurement error related to reflection
C = Supplement for prevention of reaching over
Response time T S of the SafeZone safety laser scanner
The response time T S of the SafeZone safety laser scanner depends
on
• The resolution used
• The multiple sampling used
See Section 11.2 “OSSD response times” on page 42.
Supplement Z
R
for measurement error related to
reflection
Supplement C for protection against reaching over
With a protective safety field installed horizontally, there is a risk that
people may reach over the protective safety field and in this way reach the
hazardous area before the SafeZone safety laser scanner shuts down the
hazardous motion. For this reason the calculation of the safety distance
must take into account a supplement to prevent persons from finding
themselves in a hazardous situation by reaching over the protective safety
field (see EN 294, table 1) before the SafeZone safety laser scanner
detects the intrusion to the protective safety field.
IMPORTANT If you are using the SafeZone
multizone, you can define several
monitoring cases with different
protective safety fields. In such cases
you must calculate the protective
safety field size for all protective safety
fields used.
ATTENTION Ensure that a human leg can be
detected in horizontal stationary
applications with 70 mm resolution.
Mount the scan planes for horizontal
stationary applications with 70 mm
resolution at a height of at least 300
mm (see “Height of the scan plane at
70 mm resolution” on page 26).
Recommendation Due to the choice of two resolutions and
two response times, it may be necessary to
repeatedly calculate the protective safety
field size (iterative calculation).
ATTENTION Avoid mounting retroreflectors at a
distance of less than one meter from
the boundary of the protective safety
field.
With retroreflectors positioned at a
distance of less than 1 m from the
boundary of the protective safety field
a supplement, ZR, of 200 mm must be
added to the protective safety field.