Configured for power supply redundancy in S800 I/O distributed control network platforms, the ABB SS822 (3BSC610042R1 Power Voting Unit) provides direct physical electrical execution for automated 24 VDC source selection and distribution.

Component Identification and Matrix

• Base Model: SS822
• Spare Part Number: 3BSC610042R1
• Function: Power supply voting and redundancy management
• Series: S800 I/O

Physical and Electrical Specifications

Deterministic Industrial Control Integration

The SS822 serves as a critical interface for maintaining continuous operation within S800 I/O nodes. By managing I/O density scaling through redundant power inputs, the unit ensures that backplane bus communication velocity remains stable during primary supply transitions. The unit is engineered to maintain deterministic network conditions, preventing bus-level voltage dips that could interfere with Profinet or EtherNet/IP deterministic networks during switchover events.

Ordering Information

• 1 unit: SS822 Power Voting Unit
• 1 set: Integrated DIN-rail mounting bracket and connection terminal block
• 1 unit: Technical instruction documentation

Mechanical Installation and Wiring Protocols

• Mounting Guidelines:
  • Install the unit on a standard 35 mm DIN rail in a vertical orientation to ensure proper convective cooling.
  • Maintain a minimum 20 mm clearance around the heat dissipation vents of the housing.
• Wiring Specifications:
  • Connect dual 24 VDC inputs to the designated redundant supply terminals.
  • Use cross-sectional cable sizes compatible with the terminal block ratings (0.5 to 2.5 mm squared) to ensure low-impedance connections.
  • Verify voltage polarity at the inputs before final connection to prevent internal diode reverse-bias.

Frequently Asked Questions

• Q: How does the SS822 perform power voting?

  A: The unit utilizes an internal diode-based OR-ing circuit to select the highest available voltage from two independent 24 VDC sources, ensuring a seamless supply transition.

• Q: Is this unit compatible with non-S800 power supplies?

  A: Yes, as long as the connected power supplies provide a regulated 24 VDC output within the tolerance specifications of the S800 system.

• Q: Does the SS822 require external fuses?

  A: External fusing is recommended on both input supply lines to protect the distribution wiring and the voting unit in the event of a downstream short circuit.

• Q: What is the maximum current capacity?

  A: The unit is rated for specific continuous current throughput; refer to the technical datasheet for the maximum amperage relative to operating ambient temperature.

• Q: Can I connect more than two power supplies?

  A: No, the SS822 is designed specifically for dual-input redundant power voting configurations.

• Q: What indicates an active power supply status?

  A: The front panel typically features diagnostic LEDs indicating the presence and health of each independent supply input.

• Q: Is the SS822 hot-swappable?

  A: The unit can be removed if the power supplies are de-energized; however, follow site-specific safety protocols for live-work maintenance.

• Q: Does the unit affect the backplane bus timing?

  A: As a passive power distribution component, it introduces negligible latency, ensuring backplane bus communication velocity remains within operational tolerances.