PNOZ 2
Operating Manual PNOZ 2
22151-EN-05
8
Function Description
The safety relay PNOZ 2 provides a safety-oriented interruption of a safety circuit. When
supply voltage is supplied the "POWER" LED is lit. The unit is ready for operation when the
feedback loop X1-X2 and the start circuit T33-T34 are closed.
} Input circuit is closed (e.g. E-STOP pushbutton not operated):
– The "ON" LED is lit.
– Safety contacts 13-14, 23-24 and 33-34 are closed, auxiliary contact 41-42 is open.
The unit is active.
} Input circuit is opened (e.g. E-STOP pushbutton operated):
– The "ON" LED goes out.
– Safety contacts 13-14, 23-24 and 33-34 are opened redundantly, auxiliary contact
41-42 is closed.
NOTICE
If the safety requirement (e.g. E-STOP pushbutton operated) is triggered <
6 s after starting, the delay-on de-energisation of the instantaneous safety
contacts may be increased (see Technical details [ 13]).
Operating modes
} Single-channel operation: No redundancy in the input circuit, earth faults in the start
and input circuit are detected.
} Automatic start: Unit is active once the input circuit has been closed.
} Manual start: Unit is active once the input circuit and the start circuit are closed.
} Increase in the number of available contacts by connecting contact expander modules
or external contactors/relays.
Timing diagram
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