SICK deTem4 LT Muting A/P, Operating Instructions Manual, Page: 35 / 108

DANGER
Hazard due to lack of effectiveness of the protective device
In the case of non-compliance, it is possible that the dangerous state of the machine
may not be stopped or not stopped in a timely manner.
b
Make sure that the following control and electrical requirements are met so that
the multiple light beam safety device can fulfill its protective function.
• The external voltage supply of the multiple light beam safety device must be capa‐
ble of buffering brief power failures of 20 ms as specified in IEC 60204-1.
• The power supply unit must provide safe isolation according to IEC 61140
(SELV/PELV). Suitable power supply units are available as accessories from SICK,
see "Accessories", page 96 .
4.4.1 Restart interlock
Overview
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 chang‐
ing the machine’s operating mode.
The multiple light beam safety device has an internal restart interlock.
Depending on the regulations which apply at the place of installation, a restart interlock
may be required.
Important information
DANGER
Hazard due to unexpected starting of the machine
The machine may not restart if the OSSDs switch to the ON state once the reset push‐
button has been pressed. The control must ensure that the machine only restarts if the
machine start button is also pressed after the reset pushbutton.
b
Make sure that the machine can only restart once the reset pushbutton and start
button have been pressed in the specified order.
Functionality
Before the machine can be restarted, the operator must reset the restart interlock.
! § " $
Figure 20: Schematic representation of operation with restart interlock
The dangerous state of the machine (
!
) is brought to an end if the light path is inter‐
rupted (
"
) and is not re-enabled (
§
) until the operator presses the reset pushbutton
located outside the hazardous area (
$
). The machine can then be restarted.
Depending on applicable national regulations, a restart interlock must be available if it
is possible to stand behind the protective device. Observe IEC
60204-1.
PROJECT PLANNING
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8024802/2020-07-17 | SICK O P E R A T I N G I N S T R U C T I O N S | deTem4 LT Muting A/P 35
Subject to change without notice