1. Overview
This module adopts standard Ovation rack plug-in mechanical structure, fully compatible with standard rack backplane slots. The stable DC power output from redundant main power supplies is introduced into this distribution module and split into multiple electrically isolated output branches. Each branch is configured with replaceable fuses, voltage & current sampling circuits and status feedback loops, providing power supply for designated rack slots, DPUs and I/O assemblies. Meanwhile, fault signals such as fuse blowout, overvoltage, undervoltage and overload are uploaded to the DPU and upper monitoring system through the backplane bus. Every finished module undergoes factory long-term full-load durability test, output voltage calibration and high-voltage insulation withstand test to guarantee long-term stable power splitting operation.
2. Core Functional Features
2.1 Multi-channel Isolated Branch Power Distribution
Realizes single-input multi-output power shunting; electrical isolation is designed between different output branches, and each branch supplies power to a fixed group of rack modules independently. Overload or short-circuit fault occurring on one single branch will not spread to other branches or the overall rack input power supply.
2.2 Per-branch Independent Fuse Overcurrent Protection
Each power branch is fitted 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 to support rapid on-site maintenance and replacement.
2.3 Real-time Sampling & Remote Upload of Power Parameters
Onboard sampling circuits continuously collect output voltage, load current of each branch and internal temperature of the module. Operating data can be remotely transmitted to operator stations for real-time display and historical trend storage.
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, lights the local front panel fault indicator, and sends an alarm signal to the upper monitoring platform to realize remote fault prompt and positioning.
2.5 Support Online Hot-swap Maintenance
When dual redundant main power supplies run normally, the distribution module can be replaced online without cutting off the power supply of the whole cabinet. The existing control logic and closed-loop regulation loops keep continuous operation without disturbance.
2.6 Built-in EMI Filter Anti-interference Circuit
An input-side high-frequency filter suppresses power grid surges and coupled electromagnetic interference, reduces output voltage ripple, and improves the power supply quality and operating stability 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 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 allowed 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 represents 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 main control cabinets of boilers, turbines, generators and auxiliary system cabinets, realizing partitioned power supply protection and centralized power monitoring for DPUs and all slot I/O modules in the rack.
Petrochemical Industry
Deployed in control cabinets of reactors, fractionators and compression units, implementing segmented power protection for each control loop, and avoiding full-unit control shutdown caused by single branch failure.
Metallurgy, Waste Incineration Power Plants & District Heating Stations
Undertakes secondary power distribution and branch fault monitoring for automation control cabinets, ensuring long-cycle unattended stable operation of the whole production line control system.
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