PNOZ X7
Operating Manual PNOZ X7
19692-EN-06
9
Function Description
The safety relay PNOZ X7 provides a safety-oriented interruption of a safety circuit. When
the supply voltage is applied via the E-STOP pushbutton, the “POWER” LED is lit. The unit
is ready for operation when the start circuit and feedback loop Y1-Y2 is closed.
} Input circuit is closed (e.g. E-STOP pushbutton not operated):
– The LED "CH.1/CH.2" will light.
– Safety contacts 13-14 and 23-24 are closed. The unit is active.
} Input circuit is opened (e.g. E-STOP pushbutton operated):
– The LEDs "CH.1" and "CH.2" goes out.
– Safety contacts 13-14 and 23-24 are redundantly opened.
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
Legend
} Power: Supply voltage
} Start: Start circuit
} Input: Input circuit
} Output safe: Safety contacts
} [1]: Automatic start
} [2]: Manual start
} a: Input circuit closes before start circuit
} b: Start circuit closes before input circuit
} t
1
: Switch-on delay
} t
2
: Delay-on de-energisation
} t
3
: Recovery time
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