SE-SR2
Operating instructions SE-SR2
826002433-EN-Rev.C
8
Function Description
The relay SE-SR2 provides a safety-oriented interruption of a safety circuit. When operating
voltage is supplied the "POWER" LED will light up. The unit is ready for operation when the
start circuit S12-S34 is closed.
} Input circuit is closed (e.g. light grid not interrupted):
– The LEDs "CH.1" and "CH.2" are lit.
– Safety contacts 13-14, 23-24 and 33-34 are closed, auxiliary contact 41-42 is open.
The unit is active.
} Input circuit is opened (e.g. light grid interrupted):
– The LEDs "CH.1" and "CH.2" go out.
– Safety contacts 13-14, 23-24 and 33-34 are opened redundantly, auxiliary contact
41-42 is closed.
Operating modes
} Dual-channel operation without detection of shorts across contacts: Redundant input
circuit, detects SE-SR2
– 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 without control: Unit is active once the input circuit and the start circuit are
closed.
} Manual start with control: 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 [ 12]).
} 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
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