Reset
When a protective device has sent a stop command, the stopped
state must be maintained until a reset device is activated and the
machine can be restarted in a second step.
The reset brings the protective device back to the monitoring state
after it has sent a stop command. The reset also quits the start-up
or restart interlock of a protective device, so that the machine can
be restarted in a second step.
The reset must only be possible, when all safety functions and pro‐
tective devices are functional.
The reset of the protective device must not introduce any move‐
ment or dangerous situations itself. The machine is only permitted
to start after the reset once a separate start command has been
sent.
•
Manual resets are performed using a separate, manually
operated device, such as a reset pushbutton.
•
Automatic resets by the protective device are only permitted
in special cases, if one of the following conditions is met:
°
It must not be possible for people to be in the haz‐
ardous area without triggering the protective device.
°
It must be ensured that no people are in the hazardous
area during or after the reset.
Protective field
The protective field protects the hazardous area of a machine or
vehicle. As soon as the electro-sensitive protective device detects
an object in the protective field, it switches the associated safety
outputs to the OFF state. This signal can be passed to controllers
resulting in the dangerous state coming to an end, e.g. to stop the
machine or the vehicle.
A horizontal or vertical protective field is required, depending on
the application. The electro-sensitive protective device can there‐
fore be mounted in horizontal or vertical alignment, depending on
the requirements.
External device monitoring
The external device monitoring (EDM) monitors the status of down‐
stream contactors.
In order to use the external device monitoring, positively guided
contactors must be used to switch off 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 contactors drop off when the OSSDs are switched off.
SIL
Safety integrity level
SILCL
SIL claim limit: (IEC 62061/EN 62061)
Restart interlock
The restart interlock prevents the machine from automatically
starting up, for example after a protective device has responded
while the machine is operating or after changing the machine’s
operating mode.
The restart interlock can be implemented in the protective device
or in the safety controller.
A command to reset the protective device must be given, for exam‐
ple using a reset pushbutton, before the machine can be
restarted.
16
GLOSSARY
50
O P E R A T I N G I N S T R U C T I O N S | UE410 Safeguard Detector Box
8021417/2018-01-17 | SICK
Subject to change without notice