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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 position switch is positive opening in accordance with EN 60947-5-1.
2. Contactors K3 and K4 have mirror contacts in accordance with EN 60947-4-1.
3. Stop category 0 describes an immediate stop by removal of power by interrupting a
machine or drive element in accordance with EN 60204-1.
4. 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.
5. Install the safety relay and contactors together in an installation space in accordance
with EN 60204-1 (e.g., in the control cabinet). This prevents a cross-circuit at the output
of the safety relay.
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. Close the safety door. The safety door circuit closes enable circuit S11, S12 and
S21, S22 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. Open the safety door. The safety function is triggered and contactors K3 and K4
drop out.
In the reset circuit, the mirror contacts of K3 and K4 are
closed.
Power
IN1/2
K1
K2
Power
IN1/2
K1
K2