Isolating components for modular assembly

K-system with Ex-i signal circuit

General

Ω resistor must be connected in parallel to the input circuit. This resistor is integrated in KFD2-modules and is activated by the S3 professional slide switches. For the KHA6- and the KHD2-modules, this resistor is delivered separately and must be mounted between contacts 1 and 3. The output stage of a TIB, depending on the application, can be set to professional monitor the presence or absence of material. This flexibility is guaranteed through reversible mode of operation setting. It should also be noted that an inductive proximity initiator has the reversed characteristics of a professional switch. Capacitive, photoelectric and magnetic field detection behave like a mechanical contact. By using the reversible mode of operation, the same unit can be used in both professional cases.The mode of operation is selected with the slide switch (S1 or S2).Lead breakage monitoring can be switched off with slide switch S3 when connecting mechanical contacts.These slide switches are located on the front plate of the professional barrier. The following table shows possible switching conditions. The purpose of the transformer isolated barrier is to supply power to the proximity transducer in an Ex-area, to receive the path proportional current, to convert analogue input signals into digital output signals and to transfer the switching signal to a control device. The intrinsically safe professional interface of the transformer isolated barrier is designed for [EEx ia] IIC.Essentially, the TIB consists of three components: the power feeder, the transistor switch professional amplifier and the output stage. The input and the output are separated from one another through galvanic isolation.The TIB's input stage is done through a transistor switch amplifier which provides the intrinsically safe interface. This input stage is designed in accordance with EN60947-5-6 (NAMUR). This means that the residual voltage in normal operation equals approximately 8V DC and the short circuit current equals approximately 8 mA. The switch points are in a range between 1.2mA and 2.1mA, and the hysteresis equals 0.2mA. A typical value for the input switch point is 1.6mA and 1.8mA for the output switch point. The controller circuit is monitored for lead breakage. Some models also monitor for short circuit. The term, control circuit is interpreted as connection between the proximity initiator and the input stage of the isolating amplifier, including the two-core connecting professional cable. A short circuit or lead breakage is signaled by a red PROFESSIONAL LED and the output stage is reverted to the power-off state. The output relay is cut off, and the electrical output is locked. An error message output is available in the model KFD2-SR2-Ex1.W.LB (see page50). In the event of an error, there is the ability to report it to the appropriate controller and to accordingly initiate reactions.Aside from a proximity sensor, a mechanical contact can also be used as a signal initiator within the Ex-area. This also allows the circuitry to be monitored for short circuits and lead breakage for a corresponding switching. Please refer to the data sheet for further details.If lead breakage monitoring is bypassed, a 10k

Transformerisolated amplifiersLogic controlunitsSolenoid driversRelay modulesTransmitterpower suppliesConvertersTrip amplifiersIsolated repeatersRepeater, industrial converter loop powered

Hazardous area connection

Documentationcarrier Protector cap for Power Professional rail manufacturers of connector S1 slide toggle switch (operating mode) S2 slide toggle switch(operating mode) only with 2 channel devices

KF**-SR2...

S3 slide toggle switch LB detection Power supply for DC devices over Power Rail (Power Rail connector)
Date of issue03/03/06 – Catalogue K-system Subject to reasonable modifications due to technical advances.Copyright Pepperl+Fuchs, Printed in Germany

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