1. Overview
This termination base adopts standard rack installation structure fully compatible with universal Ovation control rack backplanes. It integrates screw terminal blocks, backplane bus gold-plated connectors, module anti-lock snap mechanism and per-channel miniature fuses. Field analog/digital instrument cables terminate directly on the base terminals, and the upper-layer I/O electronic module is inserted and locked in place, realizing seamless bidirectional transmission of field signals and DPU control signals. Every base passes factory continuity testing, high-voltage insulation withstand test and wiring consistency verification, ensuring long-term anti-loosening wiring reliability under long-cycle industrial continuous operation conditions.
2. Core Functional Features
2.1 Standardized Field Cable Termination
Equipped with numbered screw terminal rows supporting multi-core shielded signal cable wiring; channel numbering corresponds one-to-one with the upper electronic module channels, facilitating on-site wiring construction, cable marking and later maintenance line checking.
2.2 Independent Channel Fuse Protection
Each signal channel is configured with an independent replaceable miniature fuse on the base side. Short-circuit or overload fault of a single field cable only blows the corresponding channel fuse, without causing power loss or signal interruption for adjacent channels and the whole rack loop; spare fuse holders are reserved for fast on-site maintenance.
2.3 Anti-Vibration Mechanical Locking Structure
Built-in module snap locking buckle, firmly fixes the inserted I/O electronic module, effectively resisting cabinet vibration induced by fans and large rotating equipment, avoiding poor contact or accidental ejection of modules; quick unlocking design enables module disassembly without special tools.
2.4 Backplane Bus Bridging & Power Distribution
Internal PCB circuit completes electrical bridging between rack backplane bus and inserted I/O module, distributes rack DC working power to the electronic module, and physically isolates field signal loops and internal DCS control power loops to prevent cross interference.
2.5 Support Hot-Swap Electronic Module Replacement
After the termination base is installed and field wiring completed, the matched upper I/O electronic module can be hot-plugged online during normal DCS operation; no re-wiring of field cables is required, greatly cutting equipment maintenance downtime.
2.6 Enhanced Insulation & Surge Suppression
Base housing adopts high flame-retardant high-insulation engineering plastic; terminal side integrates transient surge absorption components, suppressing lightning induced surges and cable coupled voltage spikes from invading the internal I/O electronic circuit.
2.7 Universal System Compatibility
Fully compatible with full series Ovation plug-in I/O electronic modules (AI, AO, DI, DO, RTD, frequency/pulse counting modules). Directly installed on standard Ovation rack slots without adapter plates or cabinet reconstruction, applicable for new cabinet assembly and spare part replacement during old unit renovation.
3. Key Technical Specifications
Mounting Mode: Standard Ovation rack fixed installation, pluggable with matched electronic I/O modules
Wiring Terminal: Screw-type stranded cable fixed terminals, unified channel serial number marking
Built-in Protection: Per-channel independent miniature fuse, transient surge absorption circuit
Insulation Resistance: ≥100 MΩ (500 VDC test voltage)
Withstand Voltage: Channel vs backplane isolation withstands 1000 VAC isolation voltage
Working Power: DC power supplied from rack backplane, distributed to upper module via internal circuit
Operating Ambient Temperature: 0 ℃ ~ +60 ℃
Storage & Transportation Temperature: −40 ℃ ~ +85 ℃
Relative Humidity: ≤95% RH, non-condensing
EMC Standard: Complies with industrial G3 anti-corrosion grade and power plant cabinet anti-interference requirements
Hot-Swap Specification: Single module can be hot-swapped one at a time under system energized state; non-sparking field loops must be de-energized before plug/unplug operation
4. Front Panel Status Indicator Definition
PWR (Green LED): Steady ON = base internal power distribution normal; OFF = fuse blown or backplane power lost
CH Channel Status LED: Lights up when the corresponding field signal loop is connected normally
FAULT (Red LED): Lights up when channel fuse blows or terminal wiring short-circuits, supporting accurate fault location
5. Application Scope
Thermal Power Industry
Used as signal wiring carrier for AI/AO/DI/DO/RTD modules in boiler, turbine and generator control cabinets, connecting temperature, pressure, flow, valve feedback, motor running status and other field instrument cables.
Petrochemical Industry
Serves as termination base for I/O modules in reactor, fractionator and pipeline unit control cabinets, realizing stable long-term connection of process measurement signals and actuator control cables.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Realizes centralized termination and circuit protection of all field control signal cables inside control cabinets, supporting long-cycle unattended stable operation of the full production line automation system.
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