Application examples for conventional PSRclassic safety relays
102597_en_03
PHOENIX CONTACT
Function description
For additional diagnostic descriptions, please refer to Section 8.
Notes on theapplication
example
1.
The light grid (ESPE) must meet type 4 requirements of standard EN 61496-1.
2.
Make sure that the signal generator (e.g., light grid) and the safety relay have the same
ground potential.
3.
Contactors K3 and K4 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.
A restart should only occur automatically if there is no hazardous situation. Please refer
to the detailed information in standard EN ISO 12100, Section 6.3.3.2.5.
6.
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 light grid is active,
there is no object in the
protective field.
Both OSSD signals from the light grid provide HIGH signals
to enable circuit S10 and S12 of the safety relay.
Contactors K3 and K4 are activated and the mirror contacts
(N/C contacts of K3 and K4) in the reset circuit are opened.
Stop
Action
Result
Diagnostics
1.
The light grid is inter-
rupted, there is an object
in the protective field.
The safety function is triggered by the interruption of the light
grid and contactors K3 and K4 drop out.
In the reset circuit, the mirror contacts of K3 and K4 are
closed.
Power
K1
K2
Power
K1
K2
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