INDUS classic 74-312
Inductive signal transmission system
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General and Function
The inductive signal transmission system solves the problem of connecting moveable safety contact
edges to a stationary evaluation system without mechanical stress Communication between the
moveable safety contact edges and the electronic evaluation system is based on induction To
achieve this, the monitoring electronics induce a frequency on a coil core, which is integrated in a
closed conductor loop
The second coil core, to which the moveable safety contact edges are connected, receives this
frequency and sends corresponding feedback to the electronic evaluation system in the event of
cable break or actuation of a sensor
The compact and easy-to-install safety relay is designed for outdoor use and can be operated with
230 V mains voltage or 24 V AC/DC
Up to four safety contact edge circuits can be connected to the switching unit Two channels (safety
contact edges opening movement and safety contact edges closing movement) are available for the
safety contact edges on the gate leaf; two channels are also available for the safety contact edges on
the leading pillar The signal transmission system monitors the travelling safety contact edges on the
gate leaf without contact and without abrasion Thestationary safety contact edges are connected
directly to the switching unit
The switching unit continuously monitors these four safety contact edge circuits for actuation or
interruption (cable break) In the event of a fault, one of the two stop commands (stop in the opening
direction or stop in the closing direction) is issued to the respective safety contact edge circuit A
terminating resistor is integrated into the end edge of the relevant safety contact edge circuit in order
to enable the standby current of the entire system to be monitored If the specified standby current
is flowing, the output relays are activated and the switching contacts are closed If the switching
element is actuated or the sensor circuit is interrupted, the relay switching contacts open
The switching states of the relays and the applied operating voltage are indicated by LEDs
If an error is present, all the safety outputs are not active
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Proper use
The INDUS classic 74-312 switching unit can only fulfil its safety-related task if used properly
The INDUS classic 74-312 safety transmission system is designed for evaluating stationary and
travelling safety contact edges with constant 82 kΩ resistance
Any uses above and beyond these uses constitute improper use The manufacturer assumes no
liability for damages arising from improper use
The device may only be used in special applications with the manufacturer’s express consent
Summary of Contents for INDUS classic 74-312
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