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P. 16
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Fire alarm, Switch, Indicator, Floodlight, Monitoring device
Text version of the page
| ISbus fie dbus | ||||||||||||
| finir! rifivicfi nnnpÍRr ex r/rx i | ||||||||||||
| 6 | ||||||||||||
| The R. STAHL field device coupler Ex e/Ex i connects intrinsically safe field devices to the non-intrinsically safe trunk. Up to four field devices can each be powered with 40 mA, so there is still adequate reserve for a hand-held tester. A feedback effect on the trunk and, thus, on the entire system must be prevented in the case of short-circuits. For this reason, each spur features 50 mA current limiting. The intrinsically safe spurs comply with FISCO and are electrically isolated from the trunk. The field device coupler features power management, described on Page 7. The coupler is mounted on DIN rails or directly in the housings made of fibre glass-reinforced polyester, sheet steel or stainless steel. The cables are connected either with screw terminals or with cage clamp terminals. The cable shields can be earthed capacitively at the terminals or directly at the bus bar. An IP 30 cover protects the non-intrinsically safe connections of the trunk so that work can be carried out at any time on the intrinsically safe spurs. The field device coupler Ex e/Ex i can be installed in Zone 1, Zone 2, Zone 21, Zone 22 or Division 2. | ||||||||||||
| Technical Details > for intrinsically safe Foundation Fieldbus H1 or Profibus PA field devices > 4 channels > electrical isolation between non-Ex i trunk and Ex i spurs > 40 mA per spur, current limitation < 50 mA > power management > connection using screw terminals or cage clamp terminals > capacitive or direct earthing for cable shields > fitted terminating resistor | ||||||||||||