PNOZ 15
Operating Manual PNOZ 15
18492-EN-04
8
Function Description
The safety relay PNOZ 15 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 S12-S34 are closed.
}
Input circuit is closed (e.g. E-STOP pushbutton not operated):
– The LEDs "CH.1" and "CH.2" are lit.
– Safety contacts 13-14, 23-24, 33-34 and auxiliary contact 53-54 are closed, auxili-
ary contact 41-42 is open. The unit is active.
}
Input circuit is opened (e.g. E-STOP pushbutton operated):
– The LEDs "CH.1" and "CH.2" go out.
– Safety contacts 13-14, 23-24, 33-34 and auxiliary contact 53-54 are opened re-
dundantly, auxiliary contact 41-42 is closed.
Semiconductor output fault Y35
}
A low signal is present at semiconductor output Y35 if the supply voltage is present and
the internal fuse (thermal circuit breaker) has not blown. If there is a fault on the safety
relay, a high signal is present at Y35, the "FAULT" LED lights. Once the cause of the
fault has been removed, the fuse must be reset via the reset pushbutton.
Operating modes
}
Single-channel operation: No redundancy in the input circuit, earth faults in the start
and input circuit are detected.
}
Dual-channel operation with detection of shorts across contacts: Redundant input cir-
cuit, PNOZ 15 detects
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– shorts across contacts in the input circuit.
}
Dual-channel operation without detection of shorts across contacts: Redundant input
circuit, detects PNOZ 15
– earth faults in the start and input circuit,
– short circuits 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.
}
Increase in the number of available contacts by connecting contact expander modules
or external contactors/relays.
