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.