Datasheet

Relays for functional safety
Safety relays PNOZ X
PNOZ X2.7P
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]
2016-09
69
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 X2.7P
– 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 X2.7P detects
– earth faults in the start and input circuit,
– short circuits in the input circuit,
– shorts across contacts in the input circuit.
} Monitored start: Unit is active once the input circuit is closed and once the start circuit is
closed after the waiting period has elapsed (see Technical details [ 73]).
} 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
} Output aux: Auxiliary contact
} t
1
: Switch-on delay
} t
2
: Delay-on de-energisation
} t
3
: Waiting period