Pilz PNOZ 8 User Manual

PNOZ 8
Operating Manual PNOZ 8
22152-EN-05
| 9
Function Description
The safety relay PNOZ 8 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-Y1 are closed.
} Input circuit is closed (e.g. E-STOP pushbutton not operated):
– Safety contacts 13-14, 23-24 and 33-34 are closed, auxiliary contact 41-42 is open.
The unit is active.
– The LEDs "CH.1" and "CH.2" are lit.
– A high signal is present at the semiconductor output switch state Y32.
} Input circuit is opened (e.g. E-STOP pushbutton operated):
– Safety contacts 13-14, 23-24 and 33-34 are opened redundantly, auxiliary contact
41-42 is closed.
– The LEDs "CH.1" and "CH.2" go out.
– A low signal is present at the semiconductor output switch state Y32.
Semiconductor output fault Y35
} A low signal is present at semiconductor output Y35 if the supply voltage is present and
the internal fuse (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 circuit,
PNOZ 8 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 cir-
cuit, detects PNOZ 8
– 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.
} Monitored start: Unit is active once
– the input circuit is closed and then the start circuit is closed and opened again.
– the start circuit is closed and then opened again once the input circuit is closed.
} Increase in the number of available contacts by connecting contact expandsion modules
or external contactors/relays.

Pilz PNOZ 8 Specifications

General

Brand	Pilz
Model	PNOZ 8
Category	Relays
Language	English