General And Function; Proper Use - ASD INDUS onboard Manuel D'utilisation

INDUS onboard 71-752
Inductive signal transmission system

3. 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 safety contact edge.
The compact and easy-to-install safety relay is designed for outdoor use and can be operated with 24 V DC
mains voltage.
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. The stationary 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 integra-
ted 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.

4. Proper use

The INDUS onboard 71-752 switching unit can only fulfil its safety-related task if used properly.
The INDUS onboard 71-752 safety transmission system is designed for evaluating stationary and travelling
safety contact edges with constant 8.2 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.
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