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The ABB SD812F (Product ID: 3BDH000014R1) is a specialized power supply module designed for ABB's AC 800F controller system . Its primary function is to provide stable and reliable DC power to the controller and its associated components, ensuring uninterrupted operation in critical industrial automation environments . It is a key component in DCS (Distributed Control Systems) used across industries like chemical, petrochemical, power generation, and metallurgy .

A critical feature of the SD812F is its support for redundant power inputs, which enhances system availability by providing a backup power source . It works in conjunction with other power modules like SA801F and SD802F to form a complete power system for the AC 800F .

Product ID 3BDH000014R1 3BDH000014R1

Product Type Power Supply Module for AC 800F Power Supply Module

Primary Function Provides power to AC 800F controller; supports redundancy Provides 12V or 24V DC power; supports redundancy

Input Voltage 24 V DC (19.2...32.5 V DC) 220 V AC or 85-264 V AC or 24 V DC (redundant)

Output Voltage 3.3 V and 5 V 12 V DC (single) or 5 V DC (5.5A) / 3.3 V DC (6.5A) or 24 V DC

Total Output Power Not specified 35W

Key Feature Dual 24V DC inputs for redundancy; buffers for up to 20ms on power failure Redundant 24V DC inputs; EMC filter; voltage monitoring

Operating Temp. Not specified in manual snippet -20°C to +60°C or 0°C to +55°C

Dimensions (WxHxD) Not specified in manual snippet 155mm (length only) or 220 x 80 x 40 mm

Weight Not specified in manual snippet 1.1 - 1.2 kg

Pre-Installation Check: Verify the module is the correct SD812F (24 V DC) version by checking its rating plate . Ensure the system software version is compatible (e.g., version 7.1 or higher for use with PM 803F CPU) .

Module Mounting: Insert the power supply module into the designated slot (typically the leftmost P slot) of the AC 800F controller . Secure it firmly with the provided screws .

Wiring for Redundancy (Recommended):

Connect two approved mains cables (e.g., TK 802F) to both input connectors on the module for redundant power .

For single-supply operation, connect a cable to one connector and cover the unused one with a dummy plug to protect against ESD .

External Protection: Install an external mains switch and a recommended 4 AT fuse (IEC/EN 60127-2/V, type 181) for each power supply line, as the module has no internal mains switch .

Functional Grounding: Ensure a functional ground connection is provided as per the installation manual (Section 3.2) .

Power On: After double-checking all connections, apply the 24 V DC power.

Critical Voltage Warning: Do not connect the SD812F module to 115-230 V AC, as this will cause immediate and permanent damage . The module is designed for 24 V DC input .

Power Supply Isolation: The power supply module must have a protective separation from the mains .

Fuse Specification: Strictly adhere to the recommended fuse specification (4 AT with a melt index of at least 22 A²s). Using a fuse with a smaller melt index can compromise safety .

Cable Routing: Lay mains power cables separately from communication cables to avoid electromagnetic interference, as illustrated in the official manual .

Altitude and Temperature Derating: Be aware that the load capacity decreases if the installation site exceeds 1000 meters in altitude or if the ambient temperature exceeds 40°C. A derating factor applies from +40°C to +50°C .

Visual Inspection: Regularly inspect the module for dust accumulation, loose wiring at the terminals, or any signs of physical damage.

Environmental Monitoring: Ensure the ambient temperature in the control cabinet remains within the specified operating range (e.g., below 50°C to avoid derating) .

Status Monitoring: While the module provides a power-fail signal to the system, routinely check system diagnostics for any power-related alarms .

Cleaning: If necessary, power down the system and gently clean the module casing with a dry, lint-free cloth. Ensure any unused connectors are covered with dummy plugs to maintain ESD protection .

Firmware Compatibility: When upgrading controller CPUs or system software, verify compatibility with the SD812F module (e.g., requiring software V7.1SP2a or higher for PM802F/PM803F) .