1. Overview
This module adopts standard Ovation rack plug-in mechanical structure, fully compatible with standard rack backplane slots. Stable DC power output from redundant main power supplies is fed into this distribution module and split into multiple mutually electrically isolated output branches. Each branch is configured with replaceable fuses, voltage & current sampling circuits and status feedback loops, supplying power to designated rack slots, DPUs and I/O assemblies. Meanwhile, fault signals including fuse burnout, overvoltage, undervoltage and overload are uploaded to the DPU and upper monitoring system via the backplane bus. Every finished module passes long-term factory full-load durability testing, output voltage calibration and high-voltage insulation withstand testing to guarantee long-term stable power splitting performance.
2. Core Functional Features
2.1 Multi-channel Isolated Branch Power Distribution
Realizes single-input multi-output power shunting; electrical isolation is implemented between different output branches, and each branch independently supplies power to a fixed group of rack modules. Overload or short-circuit fault on a single branch cannot spread to other branches or the overall rack input power supply.
2.2 Per-branch Independent Fuse Overcurrent Protection
Each power branch is equipped with a dedicated replaceable miniature fuse. Short-circuit or overload fault will only blow the corresponding branch fuse, without triggering full rack power outage; spare fuse holders are reserved for rapid on-site maintenance replacement.
2.3 Real-time Sampling & Remote Upload of Power Parameters
Onboard sampling circuits continuously collect each branch’s output voltage, load current and module internal temperature. Operating data can be remotely uploaded to operator stations for real-time display and historical trend archiving.
2.4 Latched Local Fault Indication & Remote Alarm Triggering
In case of fuse burnout, branch voltage abnormality, overload or overtemperature, the module latches the fault state, illuminates the front panel local fault indicator, and sends an alarm signal to the upper monitoring platform for remote fault prompt and rapid positioning.
2.5 Online Hot-swap Maintenance Support
With dual redundant main power supplies running normally, this distribution module can be replaced online without cutting power to the entire cabinet. Existing control logic and closed-loop regulation loops maintain continuous undisturbed operation.
2.6 Built-in EMI Filter Anti-interference Circuit
Input-side high-frequency filter suppresses grid surges and coupled electromagnetic interference, reduces output voltage ripple, and improves power supply quality and stable operation reliability of downstream control modules.
2.7 Native System Compatibility
Perfectly matched with Ovation standard racks, backplanes, redundant power supplies, DPUs and full-series I/O modules. No adapter boards or cabinet reconstruction modifications are required for installation, applicable to new cabinet assembly and spare part replacement during unit renovation projects.
3. Key Technical Specifications
Mounting Mode: Standard Ovation rack plug-in installation
Input Power: DC power output from rack redundant main power supply modules
Output Mode: Multiple mutually independent isolated DC power branches
Branch Protection: Independent replaceable fuse per channel, overcurrent limiting, short-circuit lockout
Monitoring Items: Branch output voltage, load current, internal temperature, fuse status
Isolation Performance: Reinforced electrical isolation between input and each output branch
Operating 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 Restriction: Hot plugging is only permitted when dual redundant main power supplies are in normal operating state
4. Front Panel LED Indicator Definition
PWR IN (Green): Steady ON = total input power normal; OFF = input power loss or abnormal
BRx OK (Green): Independent branch power normal indicator; steady illumination denotes normal operation
FAULT (Red): Lights up for blown branch fuse, overload, undervoltage or overtemperature; fault status latched
COMM (Green): Periodic flashing = normal data communication with backplane DPU
5. Application Scope
Thermal Power Industry
Installed in boiler, turbine, generator main control cabinets and auxiliary system cabinets, realizing partitioned power supply protection and centralized power monitoring for DPUs and all slot-mounted I/O modules within the rack.
Petrochemical Industry
Deployed in reactor, fractionator and compression unit control cabinets, implementing segmented power protection for each control loop and avoiding full-unit control shutdown induced by single branch failure.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Performs secondary power distribution and branch fault monitoring for automation control cabinets, ensuring long-cycle unattended stable operation of the full production line control system.
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