1. Overview
This termination base adopts standard Ovation rack mounting structure, compatible with standard rack backplanes. Field switch feedback contacts, breaker position signals, limit switch status and other discrete DI signals are wired onto the terminal blocks of the base. The plug-in DI electronic module is locked onto the base to complete signal transfer between field equipment and the cabinet DPU. Each unit passes factory continuity testing, insulation withstand voltage testing and pin definition verification to guarantee long-term stable wiring reliability in continuous industrial operation scenarios.
2. Core Functional Features
2.1 Channel-matched Standard Terminal Wiring
Equipped with numbered screw terminals, each terminal corresponds one-to-one with the input channel of the matched DI module, convenient for on-site cable laying, marking and later circuit checking; suitable for multi-strand control cables commonly used in power plants.
2.2 Independent Single-channel Fuse Protection
Each DI signal channel is equipped with a replaceable miniature fuse on the base side. Short circuit or miswiring fault on one field circuit only blows the corresponding channel fuse, without affecting other DI channels on the same base; spare fuse positions are reserved for quick on-site maintenance replacement.
2.3 Anti-vibration Locking Mechanism
Built-in snap fastener locking structure reliably fixes the inserted DI electronic module, resisting vibration from cabinet fans and nearby rotating machinery to avoid poor contact or loose module ejection; tool-free quick unlocking simplifies module disassembly.
2.4 Backplane Bus Signal Transfer & Power Distribution
Internal PCB realizes electrical connection between rack backplane bus and upper DI module, distributes backplane working power to the electronic module, and physically isolates the field signal loop and internal control circuit to prevent mutual interference.
2.5 Supports Hot-swap Maintenance of Electronic Modules
After the base is fixed and field wiring finished, the matched DI electronic module can be hot plugged and replaced while the DCS system remains running. No retermination of field cables is required, greatly shortening equipment maintenance outage time.
2.6 High Insulation & Surge Suppression Design
The base shell uses flame-retardant high-insulation engineering plastic; terminal area integrates transient surge absorption components to suppress induced voltage spikes coupled from long field cables, preventing surge damage to the DI electronic board.
2.7 Good System Compatibility
Exclusively matched with designated Ovation DI digital input electronic modules, directly installed into standard rack slots without adapter plates or cabinet modification, applicable for new cabinet assembly and spare part replacement during unit renovation projects.
3. Key Technical Specifications
Mounting mode: Standard Ovation rack fixed installation, mate with matched DI electronic module
Wiring terminals: Screw-type terminals for stranded cables, channel numbers clearly marked
Built-in protection: Per-channel independent replaceable fuse, surge absorption circuit
Insulation resistance: ≥100 MΩ (500 VDC test)
Dielectric withstand voltage: Channel to backplane isolation withstands 1000 VAC
Power supply: Working power taken from rack backplane and distributed to upper module
Operating temperature: 0 ℃ ~ +60 ℃
Storage & transport temperature: −40 ℃ ~ +85 ℃
Relative humidity: ≤95% RH, non-condensing
EMC standard: Meets industrial G3 anti-corrosion grade and power plant cabinet anti-interference requirements
4. Panel LED Definition
PWR (Green): Constant ON = base power supply normal; OFF = power loss or fuse blown
CH STATUS LED: Illuminated when corresponding field DI contact is closed and signal loop conducts normally
FAULT (Red): Lights up when channel fuse blows or terminal short circuit occurs, enabling precise fault positioning
5. Application Scope
Thermal power industry
Termination carrier for DI modules in boiler, turbine and generator auxiliary control cabinets, collecting circuit breaker position, isolating switch state, valve feedback and motor running/stop status signals.
Petrochemical industry
Used for discrete signal wiring of equipment interlock feedback, limit switches and safety valve status in reactor and fractionator control cabinets.
Waste incineration power plants, district heating stations
Realizes centralized termination and protection of all cabinet discrete input signals, supporting long-term unattended stable operation of automation systems.
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