Eaton MTL4850 Instruction Manual
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22DRAFT - 11 December 2014INM MTL4850_54 Rev45 MODULES5.1 MTL4850/54 – installationPlace the module over its marked connector in the position on the backplane, press it evenly and fullyonto the backplane before tightening the two (captive) mounting screws. All safe-area circuit andpower connections are made through this connector, so it must be seated properly on the backplane.If the module does not operate correctly, the module mounting should be the first point to check.5.2 Isolator modules (if used)If the backplane accommodates isolators, refer to instruction manual INM4500/4600 forinformation on wiring hazardous-area connectors for MTL4500 Series isolators.Position each isolator module in its appropriate location on the backplane. Ensure that themodule is not tilted, which could damage the connector pins, then press it carefully to thebackplane. All safe-area circuit and power connections are made through this connector.WARNING!Personnel that carry out connection of wiring to or from hazardous areas must becorrectly trained. Unless this work is done correctly, it can endanger the lives of siteworkers and seriously damage equipment.Hazardous area wiring is terminated on the isolator modules using the blue terminalsprovided on them. For full information on the wiring of MTL4500 isolators consult MTLpublication INM4500/4600.5.3 MTL4850/54 module parameters5.3.1 Setting and configurationThe speed for the RS485 interface is autodetected within the range 38400, 19200, 9600 or 1200 baud.5.3.2 HART addressUp to 63 MTL4850 / 54 multiplexer modules can be connected to a single maintenance workstation.Each multiplexer must have a unique address, which is set using the DIP switches located besidethe module on the circuit board.The address switches are binary coded and the address is set byconstructing the required number from the switch options provided, i.e. 1, 2, 4, 8, 16 and 32. Forexample, address number 29 would be set by putting switches 16, 8, 4 and 1 in the ON position (16 + 8+ 4 + 1 = 29).NOTEthe HMP-HM64 can only be set to even numbers as the other module adopts the oddaddresses. See Section 4.2.5.5.3.3 Operation at power-upThe MTL4850/54 system is controlled by a host computer running instrument managementsoftware. Although the software is needed to operate the system, some checks can be made on thecorrect functioning of the hardware in isolation. These checks are made by observing the operationof the LEDs on top of the module.5.3.3.1 Correct operationAt power on, the power (PWR) LED should light and the multiplexer should start to build, orrebuild, an internal scan list of the HART loops connected to it. This will be indicated by a regularflashing sequence (equal on and off duration) of the Fault LED. At the end of this process theFault LED should go OFF to indicate that it is now in its “running” state.5.3.3.2 ProblemsIf problems occurred during this power up sequence the Fault LED will either emit short andlong flashes to indicate that it could not find any HART loops, or it will adopt a steady ON state toindicate that a fault was detected and the process of building the list was halted.The MTL4850/54 is delivered with the default of “scanning disabled”. In either case the instrumentmaintenance software can be used to change the multiplexer’s scanning mode.5.3.3.3 Scan listEach loop connected to an MTL4850/54 is added to the scan list if a HART device is detected onpower up or if the instrument maintenance software resets the module. Loops can be addedindividually or removed from the scan list using the “loop rebuild“ facility in the instrumentmaintenance software.5.3.3.4 Scanning enabledThe MTL4850/54 scans continuously round all loops on the scan list. |
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