Application examples for conventional PSRclassic safety relays
102597_en_03 PHOENIX CONTACT 77 / 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. A restart (after a stop from stage 3 of the enable switch) should only occur automatically
if there is no hazardous situation.
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 enable switch 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. Enable switch, stage 3
(pushed through)
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
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