Figure 32: How the restart interlock works (4): the reset pushbutton must be pressed before
r
estarting the machine.
4.4.7 External device monitoring (EDM)
Overview
T
he external switching elements (external device monitoring, EDM) must be inspected
in line with the regulations which apply at the place of installation or the required relia‐
bility of the safety function.
The external device monitoring (EDM) monitors the status of downstream contactors.
Prerequisites
•
P
ositively guided contactors are used for shutting down the machine.
If the auxiliary contacts of the positively guided contactors are connected to the
external device monitoring, the external device monitoring checks whether the con‐
tactors switch correctly when the OSSDs are switched off.
4.5 Testing plan
The manufacturer of the machine and the operating entity must define all required thor‐
ou
gh checks. The definition must be based on the application conditions and the risk
assessment and must be documented in a traceable manner.
The following tests must be planned:
•
A thorough check must be carried out during commissioning and following modifi‐
cations.
•
The regular tests of the safety laser scanner must fulfill certain minimum require‐
ments.
A test object is required for some thorough checks. An optically opaque cylinder with a
black surface can be used as a suitable test object. The diameter must match the con‐
figured resolution.
Further topics
•
"T
est rods", page 123
PROJECT PLANNING 4
8024596/15VP/2019-11-15 | SICK O P E R A T I N G I N S T R U C T I O N S | nanoScan3 I/O
43
Subject to change without notice
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