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• Broken line and earth-fault protection
Isolation—protecting your system Designing your plant with good clean earth systems is not always possible. Poor ground conductivity, large process areas and heavy electrical machinery, all contribute to increased noise. This noise is induced or conducted into adjacent wiring, which in turn degrades the quality of the signals passing through the cables. Without isolation this noise is superimposed on the process signal causing a loss of accuracy, poor control and possibly failures or false trips. Many control systems, PLCs and safety systems do not have full isolation between channels. In compact well defined plant layouts this is acceptable, but these are not always guaranteed. To avoid interference between channels, isolation is the solution. The MTL4600 series isolators offer reduced risk and greater protection to the system, with all the advantages of a common design approach for both IS and non-IS signals.
System Solutions Building on the base of the MTL4500 series solutions, the MTL4600 offers a high level of signal isolation for installations where multiple loops on a common connection are not desirable. Signal isolation provides excellent protection against surges, common faults and noisy environments. It also eliminates the risk of earth loops between different areas of the plant, which, if not isolated, can cause significant errors or failures under fault conditions. MTL4600 isolators are fully compatible with all existing backplanes used with MTL4500 series and many control systems. The form factor and signal types offer the user a common approach for both IS and non-IS signals. The backplane mounting MTL4600 Series is designed with system vendors in mind for "project-focussed" applications such as Distributed Control System (DCS), Emergency Shutdown Systems (ESD) and Fire and Gas monitoring (F&G).
ISOLATOR FUNCTION SELECTOR Channels Function Digital Input MTL4604 1 switch/prox input, phase reversal + LFD MTL4610 4 switch/prox input, solid-state output MTL4611 1 switch/prox input, c/o relay output MTL4613 2 switch/prox input, solid-state output MTL4614 1 switch/prox input, relay + LFD MTL4616 2 switch/prox input, relay + LFD outputs MTL4617 2 switch/prox input, relay + LFD outputs Digital Output MTL4621 1 loop powered solenoid driver MTL4623 1 solenoid driver with LFD MTL4623L 1 loop powered solenoid driver with LFD MTL4623R 1 solenoid driver with reverse LFD MTL4624 1 switch operated solenoid driver MTL4624S 1 switch operated solenoid driver, 24V override MTL4626 2 switch operated relay Pulse Output MTL4632 1 pulse isolator, digital or analogue output Analogue Input MTL4641 1 2/3 wire transmitter repeater MTL4641A 1 transmitter repeater, passive input MTL4641AS 1 transmitter repeater, passive input, current sink MTL4641S 1 2/3 wire transmitter repeater, current sink MTL4644 2 2/3 wire transmitter repeater MTL4644A 2 transmitter repeater, passive input MTL4644AS 2 transmitter repeater, passive input, current sink MTL4644S 2 2/3 wire transmitter repeater, current sink MTL4644D 1 2/3 wire transmitter repeater, dual output Analogue Output MTL4646 1 4-20mA smart isolating driver + LFD MTL4646Y 1 4-20mA smart isolating driver + oc LFD MTL4649 2 4-20mA smart isolating driver + LFD MTL4649Y 2 4-20mA smart isolating driver + oc LFD Temperature Input MTL4675 1 temperature converter, THC or RTD MTL4676-RTD 2 temperature converter, RTD MTL4676-THC 2 temperature converter, THC
