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Application examples for conventional PSRclassic safety relays
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Function description
For additional diagnostic descriptions, please refer to Section 8.
Notes on theapplication
example
1. The laser scanner must meet type 3 requirements of standard EN 61496-3.
2. Make sure that the signal generator (e.g., light grid) and the safety relay have the same
ground potential.
3. Contactors K5 and K6 have mirror contacts in accordance with EN 60947-4-1.
4. Stop category 0 describes an immediate stop by removal of power by interrupting a
machine or drive element in accordance with EN 60204-1.
5. When using the safety relay, take into consideration the maximum permissible number
of cycles for observing the SIL/PL safety characteristics in the specific application. The
safety characteristics can be found in the AH EN SAFETY CHARACTERISTICS appli-
cation note or the SISTEMA library.
Start Action Result Diagnostics
1. The laser scanner is
active, there is no object in
the protective field.
Both OSSD signals from the laser scanner provide HIGH sig-
nals to enable circuit S12 and S22 of the safety relay.
The circuit is enabled via the reset button.
2. Press reset button S1. Contactors K5 and K6 are activated and the mirror contacts
(N/C contacts of K5 and K6) in the reset circuit are opened.
Stop Action Result Diagnostics
1. The laser scanner is inter-
rupted, there is an object
in the protective field.
The safety function is triggered by the interruption of the laser
scanner and contactors K5 and K6 drop out. In the reset cir-
cuit, the mirror contacts of K5 and K6 are closed.
After the preset time, the dropout delayed enable contacts of
the safety relay drop out.
Power
K1/K2
K3(t) K4(t)
Power
K1/K2
K3(t) K4(t)
Power
K1/K2
K3(t) K4(t)
Power
K1/K2
K3(t) K4(t)