4.3.7.4
Calculation example for the minimum distance
Calculation example of the minimum distance S according to ISO 13855
The example shows the calculation of the minimum distance for an orthogonal
approach to the protective field. A different calculation may be required, depending
on the application and the ambient conditions (e.g. for a protective field parallel to or at
any angle to the direction of approach or an indirect approach).
S = 1,600 mm/s × T +850 mm
where:
•
S = minimum distance in millimeters (mm)
•
T = stopping/run-down time for the entire system in seconds (s)
(Response time of the safe multibeam s machine’s stopping/run-down
time, incl. response time of the machine’s control system and signal propagation
time)
The approach speed is already included in the formula.
4.4
Integrating the equipment into the electrical control
Requirements for use
•
The control of the machine can be electrically influenced.
•
The connected controller and all devices responsible for safety comply with the
required performance level and the required category (for example according to
ISO 13849-1).
•
Power is supplied to all electrically connected devices in accordance with SELV/
PELV (IEC 60204-1).
•
All electrically connected devices are supplied from the same power supply.
•
All electrically connected devices use the same earthing method.
Further topics
•
"Electrical installation", page 39
4.4.1
Voltage supply
Prerequisites
•
The power supply unit is able to jumper a brief power failure of 20 ms as specified
in IEC 60204-1.
•
The power supply unit provides safe isolation according to IEC 61140 (SELV/PELV
as per IEC 60204-1).
•
The voltage supply must be provided with a fuse with a rated current of max. 2 A.
Further topics
•
4.4.2
OSSDs
Overview
You can configure the OSSD pair and use it either in PNP mode or NPN mode. For
safety functions, you must always use PNP mode (default setting). Both OSSDs of the
safe multibeam scanner always use the same mode.
4
PROJECT PLANNING
28
O P E R A T I N G I N S T R U C T I O N S | scanGrid2 I/O
8025936/2021-01-08 | SICK
Subject to change without notice
