PNOZ X4
Operating Manual PNOZ X4
19894-EN-07
8
Type: DC
*Insulation between the non-marked area and the relay contacts: Basic insulation (over-
voltage category III), Protective separation (overvoltage category II)
Function Description
The safety relay PNOZ X4 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 Y1-Y2 and the start circuit S33-S34 are closed.
} Input circuit is closed (e.g. E-STOP pushbutton not operated):
– LEDs "CH1" and "CH2" will light.
– 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 LEDs "CH1" and "CH2" go out.
– Safety contacts 13-14, 23-24 and 33-34 are opened redundantly, auxiliary contact
41-42 is closed.
Operating modes
} Single-channel operation: No redundancy in the input circuit, earth faults in the start
and input circuit are detected.
} Dual-channel operation without detection of shorts across contacts: Redundant input
circuit, detects PNOZ X4
– earth faults in the start and input circuit,
– short circuits in the input circuit.
} Dual-channel operation with detection of shorts across contacts: Redundant input cir-
cuit, PNOZ X4 detects
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– shorts across contacts in the input circuit.
} 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.
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