Application examples for conventional PSRclassic safety relays
102597_en_03 PHOENIX CONTACT 85 / 136
Function description
For additional diagnostic descriptions, please refer to Section 8.
Notes on theapplication
example
1. Two-hand operation in accordance with EN 574, type IIIC.
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. 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. Both buttons on the two-
hand control device are
not pressed.
The circuit is enabled via both buttons.
2. Press both buttons on the
two-hand control device
simultaneously.
Contactors K3 and K4 are activated and the mirror contacts
(N/C contacts of K3 and K4) are opened.
Stop Action Result Diagnostics
1. Both buttons on the two-
hand control device are
not actuated.
The safety function is triggered and contactors K3 and K4
drop out.
The mirror contacts of K3 and K4 are closed.
Power
K1
K2
Power
K1
K2
Power
K1
K2
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