1. Overview
This termination base adopts standard rack mounting structure fully compatible with universal Ovation control rack backplanes. It integrates screw terminal blocks, gold-plated backplane bus connectors, anti-vibration snap locking structure and replaceable miniature fuses for each individual channel. Field 4–20 mA current signals, DC voltage measurement cables are terminated on the base terminals, and the plug-in AI electronic module is locked in place to achieve bidirectional transmission between field measurement signals and the cabinet DPU controller. Every termination base undergoes factory continuity testing, high-voltage insulation withstand test and wiring point verification, ensuring long-term stable anti-loosening wiring performance under uninterrupted industrial operating conditions.
2. Core Functional Features
2.1 Numbered Standard Screw Terminals for Field Wiring
Equipped with channel-coded screw terminal rows, each terminal corresponds one-to-one to the channel definition of the matched AI electronic module. It fits shielded multi-core signal cables commonly used in industrial sites, facilitating on-site cable laying, labeling and later maintenance circuit inspection.
2.2 Per-channel Independent Fuse Overload Protection
Each analog signal channel is fitted with a standalone replaceable miniature fuse on the base side. Short-circuit, overload or miswiring fault on a single field cable only blows the corresponding channel fuse, without causing signal loss or power failure for adjacent channels or the whole rack loop; spare fuse sockets are reserved for fast on-site replacement.
2.3 Anti-vibration Mechanical Locking Mechanism
Built-in buckle locking structure firmly secures the inserted AI electronic module, effectively resisting vibration generated by cabinet cooling fans and nearby large rotating equipment, preventing poor contact or accidental module ejection. Tool-free quick unlocking simplifies module disassembly operations.
2.4 Backplane Bus Bridging and Isolated Power Distribution
The internal PCB circuit establishes electrical connection between the rack backplane bus and the upper AI module, distributes rack DC working power to the electronic module, and physically isolates the field instrument loop and DCS internal control circuit to eliminate cross-coupling interference.
2.5 Supports Hot-swap Maintenance of Electronic Modules
After the termination base is fixed and field wiring is completed, the matched AI electronic module can be hot-plugged and replaced while the DCS system runs normally. No re-termination of field cables is required, significantly shortening equipment maintenance downtime.
2.6 Reinforced Insulation and Surge Suppression Design
The base housing uses high flame-retardant, high-insulation engineering plastic; transient surge absorption components are integrated at the terminal area to suppress induced lightning surges and voltage spikes coupled through long-distance signal cables, avoiding surge damage to the internal AI electronic board.
2.7 Excellent Native System Compatibility
Specifically matched with corresponding Ovation analog input electronic modules, directly installable into standard Ovation rack slots without adapter plates or cabinet modification. Suitable for new control cabinet assembly and spare part replacement during unit renovation projects.
3. Key Technical Specifications
Mounting Mode: Standard Ovation rack fixed installation, pluggable with matched AI electronic module
Wiring Terminal: Screw-type terminals for stranded cables, clear unified channel serial number marking
Built-in Protection: Independent replaceable miniature fuse per channel, transient surge absorption circuit
Insulation Resistance: ≥100 MΩ (500 VDC test voltage)
Withstand Voltage: Channel-to-backplane isolation withstands 1000 VAC isolation voltage
Working Power: DC power taken from rack backplane and distributed to upper electronic module
Operating Ambient Temperature: 0 ℃ ~ +60 ℃
Storage & Transportation Temperature: −40 ℃ ~ +85 ℃
Relative Humidity: ≤95% RH, non-condensing
EMC Compliance: Complies with industrial G3 anti-corrosion grade and power plant cabinet anti-interference requirements
Hot-Swap Instruction: Individual electronic modules can be hot-swapped one by one with the system energized; non-intrinsically safe field loops shall be de-energized before plugging/unplugging.
4. Front Panel LED Indicator Definition
PWR (Green LED): Steady ON = base internal power distribution normal; OFF = power loss or internal fuse blown
CH STATUS LED: Illuminated when the corresponding field analog signal loop is normally connected
FAULT (Red LED): Lights up upon channel fuse blowout or terminal short circuit, enabling accurate fault location
5. Application Scope
Thermal Power Industry
Serves as the wiring carrier for AI modules in boiler, turbine and generator control cabinets, collecting 4–20 mA signals from pressure, flow, liquid level and temperature transmitters.
Petrochemical Industry
Used for signal termination of analog measurement loops in reactors, fractionators and pipeline process units, ensuring stable acquisition of continuous process parameters.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Realizes centralized termination and protection of all analog measurement signal cables inside control cabinets, supporting long-cycle unattended stable operation of the automation system.
Get a Quote