ABB 933-7300 S800 I/O Station Rack Power Unit Module

I. Product Description
Model Name: ABB 933-7300 S800 I/O Rack Power Supply Unit (Power Supply Unit)
Compatible System: ABB Advant OCS / MOD300 older DCS, S800 remote I/O rack-specific power supply module
Equipment Attributes: Integrated power supply box for the entire rack, providing unified power supply for the entire S800 I/O backplane, FCI bus communication card, DI/AI/AO/DO cards. It is the core power supply component for the remote IO station of the older Advant system.

Core Electrical Parameters
Input Specifications
AC Main Power: 220V AC (185～264V wide-range AC input)
Built-in Input Fuse (with fuse holder integrated)
Output Specifications
Stable Output 24VDC, providing power for the rack backplane ModuleBus bus
Load Capacity Can Drive 1 Cluster with a Maximum of 12 S800 I/O Modules
Built-in Isolated DC-DC, Backplane 5V Bus Isolated Power Supply, Protecting the Communication Bus
Protection Mechanism
Overvoltage, Undervoltage, Short Circuit, Overcurrent Automatic Protection
Built-in Multiple Fuses (also known as “Fuse Holder Integrated Power Supply”), Circuit Protection for the Bus and Field Circuits
Diagnostic Indicators
Panel RUN Green Running Light, FAULT Red Fault Alarm Light
When Power Loss, Overload, Fuse Melts, Fault Light Stays On, The Host Computer Can Collect Power Fault Signals

Structure and Installation
Form: Integrated metal cabinet-type power supply box, with snap-on door design, internally integrated fuse compartment, rectifier switch power supply, terminal block
Installation: Wall-mounted / Rack-mounted fixed installation, the entire S800 I/O cluster is equipped with a dedicated cabinet
Heat Dissipation: Built-in air-cooling heat dissipation duct, industrial wide-temperature design
Environmental Specifications
Operating Temperature: -20℃ ～ +60℃
Humidity: 5%～95% RH No Condensation
EMC: Compliant with industrial power plant, chemical explosion-proof area electromagnetic compatibility standards

 System Function and Working Process
Connect 220V mains power externally to the 933-7300 main input terminal
Internal AC-DC Conversion Outputs Stable 24VDC, Through the rack backplane ModuleBus bus to distribute power to all IO cards
At the same time, supplies power to the FCI field bus interface module to realize data interaction between the controller and remote IO
Each Group of IO Channels is Independently Protected by Circuit Fuses, A Single Channel Short Circuit Will Not Cause the Entire Station to Stop

Typical Application Scenarios
Thermal Power: Advant MOD300 unit auxiliary control, FSSS furnace safety system remote S800 IO station power supply
Petroleum Chemical / Oil and Gas: Device ESD, fire gas F&G system distributed remote IO rack
Papermaking, Metallurgy, Water Treatment: Old ABB Advant DCS renovation, spare parts replacement

 Lifecycle and Replacement Options
Lifecycle Status:停产 outdated model， original factory no longer supplies new ones， market only second-hand disassembly and refurbishment spare parts
Upgrade Replacement：
New Model SD811 (2.5A)， SD812 (5A) Independent 24V Power Supply Module， Combined with Standard S800 Rack for Use
System Upgrade to 800xA Platform， Uniformly Use SD82x Series Power Supply
Companion Spare Parts： When Replacing， It is Required to Match S800 Standard MTU Terminal Unit， FCI Bus Communication Card