Operating Manual PNOZ s2
The relay meets the following safety requirements:
} The circuit is redundant with built-in self-monitoring.
} The safety function remains effective in the case of a component failure.
} The correct opening and closing of the safety function relays is tested automatically in
each on-off cycle.
} The unit has an electronic fuse.
Block diagram/terminal configuration
23 33 41
24 34 42
Centre: Front view with cover, right: Front view without cover
*Safe separation in accordance with EN 60947-1, 6 kV
} Single-channel operation: no redundancy in the input circuit, earth faults in the reset
and input circuit are detected.
Automatic start: Unit is active once the input circuit has been closed.
} Manual start: Unit is active once the input circuit is closed and then the start circuit is
Monitored start with falling edge: 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.
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-
} 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.