Application examples for conventional PSRclassic safety relays
102597_en_03 PHOENIX CONTACT 79 / 136
Function description
For additional diagnostic descriptions, please refer to Section 8.
Notes on theapplication
example
1. When using enable switches, observe the notes in standards EN 60204-1 and
EN ISO 10218.
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. Depending on the level of risk, the use of a two-stage enable switch may only be per-
mitted together with an emergency stop device.
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. Enable switch, stage 1
(not activated)
The circuit is enabled via the enable switch.
2. Enable switch, stage 2
(enable)
The circuit is enabled via the reset button.
3. Press reset button S2 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. Enable switch, stage 1
(not activated)
The safety function is triggered and contactors K3 and K4
drop out immediately.
In the reset circuit, the mirror contacts of K3 and K4 are
closed.
Power
IN1/2
K1
K2
Power
IN1/2
K1
K2
Power
IN1/2
K1
K2
Power
IN1/2
K1
K2
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