Eaton MTL831B Manual

Also see for MTL831B: Technical support

Contents

INM831B Rev 4 7ON(side view)OFF(side view)SW 100 SW 101 SW 100 - Tx addressTx AddressSW 100SW10 11 01101 SW 101 - RTD mode1 = Terminal bank 11 - 172 = Terminal bank 18 - 116RTD modeON = 2- or 4-wire modeOFF = 3-wire modeFigure 13 - Tx address and RTD Mode switches4.7 Cable screensScreens of sensor cables should be earthed at the MTL831B. If asensor cable is earthed at the sensor, then it should not be earthed orconnected to other screens at the MTL831B.The screen of a data highway cable between the MTL831Btransmitter and MTL3052 isolator is normally connected to an earthrail in the MTL831B's field enclosure. The screen of this cable mustnot be connected at the MTL3052/MTL838B end of the datahighway.5 CONFIGURATIONInternal switches are used to set the address of the transmitter and theoperating mode for RTD sensors. See Figure 13 for details of settings.Access to the switches is obtained by loosening the captive screwsholding the blue terminal strip for terminals 1 to 21, until the strip canbe removed. (Replacement of the blue terminal strip is the reverse ofits removal instructions).5.1 Transmitter AddressFour addresses (1 to 4) are possible with the SW100 switch settingsas shown in Figure 13.Transmitter addresses must start at address 1 and must be sequential.This means that two transmitters must have addresses 1 and 2, not 1and 3 or 1 and 4.If only one transmitter is connected, its switches must be set fortransmitter number 1 (ON, ON). Note that this is also the factorydefault setting.5.2 RTD mode settingAs mentioned in Section 4.1, the transmitter has two banks of inputterminals - I1 to I7 and I8 to I16. These two banks of inputscan be set independently, using the switches on SW101, to 3-wiremode (OFF) or 2/4-wire mode (ON) - see Figure 13.Further documentationFor further information on the MTL831B multiplexer transmitter,MTL838B multiplexer receiver and the MTL3052 data highwayisolator, refer to:MTL831B data sheet in catalogueMTL838B-MBF data sheet in catalogueINM838B MTL838B-MBF instruction manualMTL3052 data sheet in catalogueThe above documents are available from our web sitehttp://www.mtl-inst.com0N 2 0N 21 2 Tx #ON ON 1OFF ON 2ON OFF 3OFF OFF 40N 2 0N 2

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