Datasheet

Relays for functional safety
Safety relays PNOZsigma
PNOZ s3
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]
2016-09
575
} Monitored start with rising edge: Unit is active once the input circuit is closed and
once the start circuit is closed after the waiting period has elapsed (seetechnical de-
tails).
} Start with start-up test: The unit checks whether safety gates that are closed are
opened and then closed again when supply voltage is applied.
} Increase in the number of available instantaneous safety contacts by connecting con-
tact expander modules or external contactors/relays;
A connector can be used to connect 1 PNOZsigma contact expander module.
Timing diagram
[2][1] [3] [4]
Legend
} POWER: Supply voltage
} Start: Start circuit
} Input: Input circuits
} Output safe: Safety contacts
} Out semi: Semiconductor output
} [1]: Automatic start
} [2]: Manual start
} [3]: Monitored start with rising edge
} [4]: Monitored start with falling edge
} a: Input circuit closes before start circuit
} b: Start circuit closes before input circuit
} t
1
: Switch-on delay
} t
2
: Delay-on de-energisation
} t
3
: Waiting period with a monitored start
} t
4
: Min. start pulse duration with a monitored start