MTL838C - Process Instrumentation & Protection (MTL)

Date: Dec 26, 2024 Views: 858

　　Product description

　　The MTL838C-MBT Receiver may be connected to one or two MTL831C Analog Transmitters. It holds the configuration for the transmitters and receives measurement data from up to 32 sensors (16 from each transmitter). The data is then made available via Modbus TCP. The MTL838C-MBT must be installed in a safe area. However, by using the MTL5553 Isolator/Power Supply, the MTL831C’s may be installed in Zone 0, 1, or 2.

　　The MTL831C can monitor up to 16 inputs from THC or millivolt sources or 2, 3 or 4-wire RTDs.

　　The MTL838C-MBT, MTL5553, and MTL831C are connected by a data highway consisting of a single shielded, twisted-pair cable.

　　The data highway carries both signal and power over distances up to 2km, depending on the application, the cable, and the (noise) environment - see Section 4.4. The data highway cables can be simple twisted-wire pairs or pairs of wire within an IS multicore cable.

　　GETTING STARTED

　　Installation of the MTL838C-MBT Receiver is divided into three main topics.

　　Mechanical Installation - how to mount the MTL838C-MBT and how it may be fitted into an enclosure.

　　Electrical Connections - power, data highway, Ethernet, and alarm connections. If units are installed in our enclosures, it details any special wiring arrangements.

　　Configuration - all configuration is either over a Modbus TCP® link or via a USB connection to software on a PC and is covered in separate documents.The MTL838C-MBT must be installed in a safe area.

　　Mounting options

　　The unit can be mounted on T-section DIN-rail. Eaton has a range of enclosures - ENC8, ENC8-SS, ENC83 or ENC83-SS - to provide suitable IP67 protection if the Receiver is located in an exposed area.

　　Munting on T-section DIN-rail

　　To install, tilt the MTL838C-MBT to the left and hook to the left side of the standard 35mm DIN46277 T-section rail. Push to the right and allow the unit to rotate down to sit flat on the DIN Rail. Allow it to spring back to the left and the right side will hook to the DIN Rail.

　　To remove, push the MTL838C-MBT to the right and tilt the right side away from the DIN Rail. While tilted, allow it to spring back to the left and remove from the DIN

　　CONNECTIONS

　　The connection terminals are along the edges of the Receiver.

　　The various connections are detailed in the following sub sections.

　　General wiring recommendations

　　Use of ferrules and a torque screwdriver is recommended to guarantee proper wire termination. All wire terminals should be torqued to 0.5N-m. The retaining screws on the two pluggable connectors should be tightened to 0.3N-m.

　　Input Power

　　A nominal 24VDC power supply should be wired to the 2 pin pluggable connector labeled “PWR”. An SELV rated power supply is recommended. The cable from the supply to the MTL838C-MBT should be less than 30m in length. The 24VDC power supply negative lead should be grounded to a clean instrument ground.

　　Data Highway

　　The Data Highway connects the MTL838C-MBT to the MTL831C (or MTL5553 if installed). It supplies power to as well as communication with the MTL831C’s. A shielded, twisted-pair cable should be used for this set of 3 terminals. Connect the two wires to the “+” and “-“ terminals in a way that will ensure that polarity is maintained when connected to the MTL831C. The shield is connected to the “S” terminal which is also internally wired to the “GROUND” terminals.

　　The Data Highway cable is usually long and 16 gauge Foundation Fieldbus cable that has been checkmarked as meeting the FF standard for cables is recommended. This will help ensure that the maximum cable lengths can be achieved with successful communication in the presence of noise.

　　The maximum data highway length will depend upon two key factors: the type and quality of the cable used, and the level of electrical interference present in the environment.

　　Typically a user might expect: IS applications - 1km

　　Non-IS applications - 2km.

MTL838C.pdf

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