Emerson Ovation 5A26137G13 Rack Secondary Power Distribution Module
The 5A26137G13 is an original plug-in secondary power distribution module dedicated to Emerson Ovation DCS rack assemblies. The suffix G13 stands for a specific finalized hardware revision version, which has passed factory full-load aging test, output voltage precision calibration and complete reliability verification. It cooperates with rack redundant main power supply modules to realize DC power branching, independent branch fuse protection, real-time electrical parameter monitoring and fault alarm uploading inside the control cabinet. It distributes isolated DC working power to DPU controllers, various I/O electronic modules and matched termination bases separately. Each power branch is provided with independent protection and operating status detection functions, and supports hot-swap maintenance when dual redundant power supplies are operating normally. It is an essential power distribution component for standard Ovation control cabinets and is widely used in thermal power, petrochemical, metallurgy and other continuous process industries.
Description
1. Module Introduction
It adopts a standard Ovation rack plug-in structure and is fully compatible with standard backplane slots. The DC power output from redundant main power supplies is fed into this module and split into multiple electrically isolated output branches. Each branch is fitted with replaceable fuses, voltage & current sampling circuits and status feedback loops to supply power to DPUs and I/O assemblies in designated slots. Meanwhile, fault signals including blown fuses, overvoltage, undervoltage and overload are transmitted to the DPU and upper monitoring system via the backplane bus. Each unit undergoes long-term full-load durability tests, output precision calibration and insulation withstand tests before delivery to ensure stable long-term power distribution performance.
2. Core Functional Features
(1) Multi-channel Isolated Branch Power Distribution
It achieves power splitting with one input and multiple outputs. All branches are electrically isolated from one another; overload or short-circuit fault on a single branch will not affect other branches or the total rack input power, confining the fault range effectively.
(2) Independent Fuse Overcurrent Protection Per Branch
Each power branch is equipped with an individual replaceable miniature fuse. Short circuit or overload only blows the fuse of the faulty branch instead of causing total cabinet power loss. Spare fuse holders are reserved for quick on-site replacement and maintenance.
(3) Real-time Electrical Parameter Sampling & Remote Upload
Built-in sampling circuits continuously collect output voltage, load current of each branch and internal temperature of the module. Operating data can be uploaded remotely to operator workstations for real-time display and historical trend storage.
(4) Latched Fault, Local Indication & Remote Alarm
When a fuse blows, branch voltage abnormality, overload or overtemperature occurs, the module latches the fault state, lights the front panel fault indicator, and sends an alarm signal to the upper platform for rapid remote fault location.
(5) Support Online Hot Maintenance
When dual redundant main power supplies operate normally, this power distribution module can be replaced hot without powering down the entire cabinet. Original control logic and closed-loop regulation loops keep continuous operation with no disturbance.
(6) EMI Filter Built-in for Anti-interference Performance
An integrated high-frequency filter at the input side suppresses grid surges and electromagnetic interference coupled through cables, reduces output voltage ripple, and improves power supply quality and operational stability of downstream controllers and I/O modules.
(7) Native System Compatibility
It perfectly matches Ovation standard racks, backplanes, redundant power supplies, DPUs and full-series I/O modules. No adapter boards or cabinet reconstruction are required, applicable for new cabinet assembly as well as spare part replacement during unit renovation.
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 Form: Multiple mutually independent isolated DC power branches
Branch Protection: Individual replaceable fuse per channel, current limiting and short-circuit lockout
Monitored Items: Branch output voltage, load current, internal module temperature, fuse status
Isolation Grade: Reinforced electrical isolation between input and each output branch
Operating Ambient Temperature: 0 ℃ ~ +60 ℃
Storage & Transportation Temperature: −40 ℃ ~ +85 ℃
Relative Humidity: ≤95% RH, non-condensing
EMC Compliance: Meets industrial G3 anti-corrosion grade and anti-interference requirements for power plant control cabinets
Hot-swap Restriction: Hot plugging is only allowed when dual redundant main power supplies work normally
4. Definition of Front Panel LED Indicators
PWR IN (Green): Steady ON = normal total input power; OFF = input power loss or abnormality
BRx OK (Green): Individual branch power indicator; steady ON means normal power supply of this branch
FAULT (Red): Lights up for blown branch fuse, overload, undervoltage/overvoltage or overtemperature, with fault status latched
COMM (Green): Periodic flashing = normal communication with backplane DPU
5. Typical Application Scenarios
- Thermal Power IndustryInstalled in main control cabinets for boilers, turbines, generators and auxiliary control cabinets, implementing separate power supply protection and centralized power monitoring for DPUs and I/O modules in all rack slots.
- Petrochemical IndustryApplied in control cabinets for reactors, fractionation units and compressor sets to realize segmented power protection for each control loop, avoiding total unit control shutdown triggered by single branch failure.
- Metallurgy, Waste Incineration Power Plants & Heating StationsPerforms secondary power distribution and branch fault monitoring for automatic control cabinets, guaranteeing long-cycle unattended stable operation of the whole production line control system.
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