Description
Emerson KJ3002X1‑BA1
Technical Specifications
- Quantity of Input Channels: 8 independent two‑wire analog input channels
- Input Signal: 4‑20 mA two‑wire transmitter current signal
- Communication Protocol: HART 5 and HART 7 compatible
- LocalBus Power Requirement: 12 VDC, 150 mA maximum consumption
- Bussed Field Power Output: 24 VDC, 300 mA total output for field transmitters
- Per‑Channel Field Circuit Rating: 24 VDC, 32 mA
- Isolation Performance: Galvanic isolation between field side and DCS system backplane
- Operating Ambient Temperature: 0℃ ~ 60℃
- Storage Temperature: -40℃ ~ 85℃
- Relative Humidity: 5% ~ 95%, non‑condensing
- Protection Class: IP20
- System Communication Bus: DeltaV LocalBus proprietary backplane bus
- Installation Method: Plug‑in installation inside DeltaV standard equipment rack
Functional Features High‑precision analog‑to‑digital conversion circuit completes high‑fidelity sampling for 4‑20 mA analog measurement signals. Integrated HART modem realizes bidirectional digital data transmission on two‑wire analog loops without additional communication cables. Galvanic isolation circuit isolates field instrument loop and DCS internal control circuit, suppresses surge pulse and common‑mode noise from industrial field cables. Independent diagnosis circuit for every channel monitors loop current and power supply state continuously. Front‑panel LED indicators display module power status, general fault alarm and real‑time signal status of each input channel. Hot‑swap hardware structure allows module replacement under non‑critical process operating conditions without powering off control cabinet. Supports remote reading of HART device variables, instrument fault diagnosis and parameter configuration through DeltaV engineering software or handheld HART communicator.
Application Scenarios DeltaV DCS control cabinets used in chemical plants, oil refineries, natural‑gas processing stations, pharmaceutical manufacturing lines, thermal power generation units and sewage‑treatment facilities. It connects two‑wire HART smart pressure transmitters, flow transmitters, liquid‑level transmitters and temperature transmitters for collecting key process variable signals.
Performance Parameters Analog signal acquisition accuracy keeps stable within full rated operating temperature range. Analog‑to‑digital sampling circuit filters high‑frequency electromagnetic interference on field signal loops. HART communication maintains reliable data interaction on long‑distance shielded twisted‑pair signal lines. Diagnostic circuit quickly identifies loop wire break, short‑circuit and transmitter power‑loss fault. DeltaV LocalBus backplane ensures stable transmission of measured process data and fault alarm events.
Material Composition Flame‑retardant black engineering plastic front shell. Multi‑layer flame‑retardant glass‑fiber epoxy printed circuit board. High‑resolution analog‑to‑digital conversion chips, HART modem components, main microprocessor, galvanic isolation devices and LED status indicator lamps. Gold‑plated copper alloy backplane connector with anti‑oxidation plating. Matched wiring terminal base uses flame‑retardant PA plastic and nickel‑plated copper screw terminals.
Structural Features Compact plug‑in card physical size matching DeltaV rack slot installation dimension. Front panel is equipped with power indicator light, fault alarm indicator light and eight separate channel status LED indicators. Built‑in guide rails and spring mechanical latch firmly fasten module in rack slot and resist vibration inside control cabinet. Rear gold‑plated multi‑pin connector completes electrical connection with DeltaV rack LocalBus backplane. Bottom contact pins are precisely aligned to matched terminal base to achieve field instrument signal wiring termination. Module outer shell is provided with multiple heat‑dissipation slots to realize natural convection heat dissipation.
Working Principle Module obtains working power from DeltaV rack backplane LocalBus, and outputs 24 VDC loop power to field two‑wire HART transmitters through terminal base and field cables. Field smart transmitters convert physical process parameters into 4‑20 mA analog current signal and feed back current signal to module input channel. Analog current signal passes through galvanic isolation circuit and enters analog‑to‑digital conversion unit to be converted into digital measurement data. HART modem component parses superimposed HART digital signal from analog loop to obtain instrument tag, calibration data and diagnostic alarm information uploaded by field transmitter. Digital measurement values and HART device information are transmitted to DeltaV main controller through rack LocalBus backplane bus. Real‑time sampling circuit monitors current magnitude and power state of each channel loop continuously. When wire break, short‑circuit or transmitter power‑loss fault occurs, the module generates fault flag and uploads alarm information to DeltaV operator station.
Installation Requirements Insert module along rack guide rail into specified DeltaV rack slot and fully lock mechanical latch. Field HART transmitter wiring must adopt shielded twisted‑pair cables, and cable shielding layer performs single‑point grounding inside control cabinet. Analog signal cables shall maintain sufficient separation distance from high‑voltage power cables to avoid electromagnetic interference coupling. Do not block heat‑dissipation slots on module shell, keep unobstructed air circulation around module installation position. After hardware installation completes, finish module hardware identification and HART device parameter configuration download in DeltaV engineering workstation.
