The SD812F (Part Number: 3BDH000014R1) is a high-performance, rail-mounted power supply unit designed for the Freelance AC 800F controller system and S800 I/O modules. It is engineered to provide a stable, filtered 24V DC power source, ensuring the reliable operation of sensitive industrial automation hardware in demanding environments.

Technical Specifications

Product Technical Description

The SD812F is more than a standard power converter; it is a system-integrated component that features advanced monitoring and protection circuitries specifically for the Freelance automation platform.

Key Technical Attributes:

• Redundancy Capability: The SD812F can be operated in parallel with another unit to create a redundant power architecture. This ensures that the control system remains powered even if one supply unit fails.

• Overload Protection: It features a "Soft Start" and electronic current limiting to protect downstream 24V DC components from power surges during startup or fault conditions.

• Power Factor Correction (PFC): Equipped with active PFC to ensure high efficiency and minimal harmonic distortion on the supply network.

• Status Monitoring: Includes a dry contact (Relay Output) for "DC OK" signaling, allowing the PLC or DCS to monitor the power health status in real-time.

• Compact Design: The slim-line housing saves valuable space within the electrical cabinet while maintaining excellent heat dissipation through natural convection.

FAQ: Common Technical Inquiries

Q1: Can I use the SD812F with I/O modules from other ABB series like S900?A: Yes, while it is optimized for the AC 800F and S800 I/O, it is a standard 24V DC / 10A power supply and can be used to power any industrial equipment that matches its output specifications.

Q2: Does this unit require an external fuse on the output side?A: The unit is electronically protected against short circuits. However, for selective protection of multiple branches, it is recommended to use external circuit breakers (e.g., ABB S200 series) for each individual load circuit.

Q3: How many SD812F units can be connected in parallel?A: For standard redundancy (1+1), two units are used. For increased power, you can parallel units, but ensure the output voltages are adjusted to be identical (within 50mV) to ensure even load sharing.

Q4: What is the meaning of the "DC OK" LED?A: A steady green LED indicates that the output voltage is within the nominal range (above 21.5V DC). If the LED is off, check the input power or look for a downstream short circuit.

Q5: Is it suitable for high-vibration environments?A: Yes, the SD812F is designed for industrial use and meets standard vibration and shock requirements for cabinet-mounted automation components.