Requirements for the electrical control of the machine
Both outputs are short-circuit protected to 24 V DC and 0 V. When the light path is
clear, the OSSDs are in the ON state. When a switch-off condition is present (e.g., inter‐
ruption in the light path), the OSSDs are in the OFF state. In the event of a device fault,
at least one OSSD is in the OFF state.
The multiple light beam safety device complies with the rules for electromagnetic com‐
patibility (EMC) for the industrial sector (Radio Safety Class A). Radio interference can‐
not be ruled out when used in residential areas.
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,
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.
Depending on the regulations which apply at the place of installation, a restart interlock
may be required.
The protective device has an internal restart interlock. You must therefore implement a
restart interlock externally via the circuitry or the control if needed, e.g. in connection
with the SICK RLY3-OSSD2 / RLY3-OSSD3 safety relay.
Functionality
Before the machine can be restarted, the operator must reset the restart interlock.
!
§
"
$
Figure 14: 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.
4
PROJECT PLANNING
22
O P E R A T I N G I N S T R U C T I O N S | deTem2 Core IP69K
8021554/14Q7/2020-04-27 | SICK
Subject to change without notice