General Information And Functional Description; Proper Use - ASO Safety Solutions ISK 77 Série Mode D'emploi

3. General information and functional description

The ISK signal transmission s��stem solves the problem of connecting moveable sensors to a
stationar�� evaluation s��stem without mechanical stress. Communication between the moveable
sensors and the electronic evaluation s��stem is based on induction. To achieve this, the monitoring
electronics induce a frequenc�� on a coil core, which is integrated in a closed conductor loop.
The second coil core, to which the moveable sensors are connected, receives this frequenc�� and
sends corresponding feedback to the electronic evaluation s��stem in the event of cable break or
actuation of a sensor.
The ISK 77 / SPK 77 switching unit is used for evaluating safet�� contact edges for safeguarding
locations where there is a risk of crushing and cutting.
The switching unit is designed and t��pe-approved in accordance with EN ISO 13849 "Safet��-related
parts of control s��stems" for Performance Level d. To meet the Performance Level, the switching
unit has a redundant design with two independent semiconductor switches; the abilit�� of these
switches to switch off is constantl�� tested.
Monitoring of the standb�� current is made possible b�� an integrated terminating resistor in the
sensors. If the specified standby current is flowing, a voltage is output at the respective outputs. If
the sensor is actuated or the sensor circuit is interrupted, the voltage is switched off at the respective
outputs.
The monitoring state of the sensors and the applied operating voltage are indicated b�� LEDs.
During troubleshooting after actuation / failure of the sensor or after a power failure, the switching
unit automaticall�� re-enables the control circuits with a dela�� time.

4. Proper use

The switching unit is intended to be used as protection in combination with safet�� contact edges with
integrated 8.2 KW resistor for standb��-current monitoring on a gate s��stem.
An�� uses above and be��ond these uses constitute improper use. The manufacturer assumes no
liabilit�� for damages arising from improper use.
The ISK 77 / SPK 77 switching unit can only fulfil its safety-related task if used properly.
The device ma�� onl�� be used in special applications with the manufacturer's express consent.
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