Description
The ABB SD822 (often categorized under system catalog number 3BSC610038R1) is an industrial switch-mode power supply designed for the Advant OCS and System 800xA control platforms. It converts a standard single-phase AC utility voltage (or high-voltage DC input) into a stabilized 24 V DC output rail. Rated at 5 A continuous output, this compact, DIN-rail-mounted power supply is primarily utilized to energize S800 I/O clusters, field instrumentation loops, and processing controller nodes.
Technical Specifications
| Parameter | Value / Detail |
| Model Number | SD822 |
| Product ID | 3BSC610038R1 |
| Input Voltage Range (AC) | 100 to 240 V AC nominal (85 to 264 V AC operational range, 47 to 63 Hz) |
| Input Voltage Range (DC) | 110 to 300 V DC nominal |
| Output Voltage | 24 V DC nominal (Adjustable via front potentiometer from 24 to 28 V DC) |
| Continuous Output Current | 5 A at 24 V DC (operational ambient temperature up to +60 °C) |
| Efficiency | 88.5% typical at nominal load configuration |
| Power Factor Correction | Active PFC (>0.92 at 230 V AC load conditions) |
| Isolation Rating | 3 kV AC Input to Output insulation baseline |
| Mounting Footprint | 35 mm symmetrical DIN-rail support bracket |
| Dimensions (W x H x D) | 40 mm x 130 mm x 125 mm (1.57″ x 5.12″ x 4.92″) |
| Operating Temperature | −25 to +70 °C (−13 to +158 °F); check derating matrices above +60 °C |
Technical Features & Field Engineering Context
Redundancy and Diode Mechanics
The SD822 is optimized for high-availability process plants. When deployed in critical infrastructure architectures, multiple SD822 modules can be configured in parallel to establish an N+1 or 1+1 redundant network topology. The module contains internal decoupling diodes integrated directly onto its output stage. In field configurations, this configuration allows technicians to connect outputs directly to a shared power rail without requiring an external voting/diode module (such as the SS822 or SS832 unit blocks). If one power supply experiences an internal component failure or input short circuit, the internal diode acts as a reverse barrier, preventing the healthy parallel supply from dumping fault current into the damaged node.
Inrush Current and Circuit Breaker Coordination
- Thermal Protection: The power supply incorporates internal electronic current limiting that switches to a constant-current foldback mode under overload or short-circuit conditions.
- Inrush Current Control: An internal active circuit limits the initial AC inrush current during cold-start sequences to under 15 A. When designing the distribution panel, coordinate this parameter with appropriate Type C characteristic circuit breakers to prevent spurious tripping of supply breakers when powering up an entire instrumentation rack simultaneously.
Commercial and Logistics Status
- Condition: Factory Sealed, New Original (New Surplus) or Refurbished (tested and certified under full 5 A electronic load profiles).
- Warranty Period: 12-month comprehensive structural and operational warranty from date of cargo dispatch.
- Global Lead Time: Ships within 1 to 3 business days via DHL, FedEx, or UPS express options.
- Documentation: User datasheets and standard environmental test protocols should be verified against the core system build documents before replacing components in running DCS backplanes.
Commercial Note: The listed value for this industrial component is indicative and depends on spot market availability and regional logistical pricing elements. Contact our procurement center for a firm, itemized commercial quotation.
Frequently Asked Questions
Can the SD822 be used to power inductive field loads like solenoid valves directly?
Yes. The 5 A output rail handles dynamic inductive switching, but field engineering best practice dictates installing external flyback suppression diodes or varistors directly across the inductive load terminal blocks. This prevents inductive voltage spikes from feeding back through the field wiring and destabilizing sensitive analog I/O loops tied to the same 24 V DC bus.
What is the function of the front panel “DC OK” LED indicator?
The “DC OK” green LED continuously monitors the internal output voltage stage. If the output drops below approximately 21 V DC due to an internal component failure or severe overload condition, the LED turns off, providing field maintenance teams with an immediate visual diagnostic indicator during troubleshooting.
How do I configure the module for optimal load sharing in parallel setups?
To ensure even thermal loading across two parallel SD822 units, measure the individual output voltages with a precise digital multimeter before tying their outputs to the common bus. Adjust the front-accessible potentiometers until both independent modules match within \pm 50 mV under equal standby conditions. Mismatched voltages will cause the supply with the higher setting to carry the entire system load until it hits its current limit, accelerating component degradation.
