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- ABB
- SS855 2PAA125624R1
- Power Voting Unit
- Sweden (SE)
- 127 × 36 × 124 mm
- 0.28 kg
- Xiamen, China
- New & In Stock
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Product Overview
The ABB SS855 2PAA125624R1 System 800xA Power Voting Unit is a power-management component used in ABB System 800xA control architectures where redundant power sources or power modules need to be coordinated. It forms part of the system power infrastructure rather than performing process-control logic itself.
In a redundant control system, maintaining the required supply to automation equipment is essential for continuous operation. The SS855 Power Voting Unit can be used to manage the relationship between redundant power inputs and the connected system load, helping the power architecture respond appropriately to the condition of the available sources.
The unit is suited to control cabinets and automation installations where multiple power paths are incorporated into the System 800xA infrastructure. Its function is particularly relevant in architectures that use redundant power arrangements to reduce the effect of an individual power-source fault.
For maintenance personnel, the SS855 should be considered as part of the power distribution and redundancy layer. Diagnosis typically involves checking the incoming power paths, associated power modules, voting behavior, connections, and the downstream System 800xA equipment.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | 2PAA125624R1 |
| Product Family | System 800xA |
| Product Type | Power Voting Unit |
| Primary Function | Power-source voting and redundancy management |
| System Role | Power management and redundancy interface |
| Application | System 800xA control and automation infrastructure |
| Dimensions | 127 × 36 × 124 mm |
| Weight | 0.28 kg |
Product Features
- System 800xA Power Voting Unit for redundant power architectures
- Supports coordination of redundant power paths
- Provides a dedicated interface within the system power infrastructure
- Suitable for control cabinets containing redundant automation power supplies
- Helps maintain power availability when multiple supply paths are used
- Can be incorporated into System 800xA control-system installations
- Suitable for industrial process and automation environments
- Useful for maintenance of redundant control-system power arrangements
Working Principle
The SS855 operates within a redundant power architecture by monitoring and coordinating the available power paths. When multiple supply sources are connected, the voting function determines the usable power condition presented to the downstream system according to the installed architecture.
Power Source A → SS855 → Redundant Power Path → System 800xA Equipment
Power Source B → SS855 → Redundant Power Path → System 800xA Equipment
The unit’s role is to support continuity of the downstream supply when the redundant architecture is operating normally. If one power source becomes unavailable, the remaining available path can continue supporting the connected equipment when the overall system configuration permits it.
The SS855 is therefore part of the power redundancy chain rather than a conventional controller. Its operation must be considered together with the associated power modules, distribution wiring, and System 800xA equipment receiving the supply.
Role in a System 800xA Redundant Power Architecture
The SS855 occupies the power redundancy layer between redundant power sources and the automation equipment they supply.
Redundant Power Supplies → SS855 Power Voting Unit → Power Distribution → System 800xA Control Equipment
| System Element | Function |
|---|---|
| Power Supply A | Provides one source of control-system power |
| Power Supply B | Provides the redundant power source |
| SS855 | Coordinates the redundant power paths |
| Power Distribution | Delivers the available power to connected equipment |
| System 800xA Controllers | Executes process-control and automation functions |
| I/O Equipment | Exchanges process signals with field devices |
| Field Devices | Provides sensing and actuation for the controlled process |
The voting unit helps separate power redundancy management from the control functions performed by the System 800xA controllers and I/O equipment.
Industrial Applications
| Application | Typical Use |
|---|---|
| Process Automation | Redundant control-system power infrastructure |
| Power Generation | Power redundancy for plant automation equipment |
| Oil and Gas Facilities | High-availability control-system power arrangements |
| Chemical Plants | Continuous power support for control equipment |
| Water and Wastewater | Redundant power architecture for automation systems |
| Distributed Control Systems | Power-path coordination within control-system cabinets |
| Industrial Control Rooms | Redundant supply infrastructure for automation hardware |
Installation and Maintenance
- Confirm that the SS855 model matches the intended System 800xA power architecture.
- Review the redundant power arrangement before installation or replacement.
- Isolate the relevant power circuits according to the site’s electrical safety procedures.
- Identify all incoming and outgoing power connections before disconnecting the existing unit.
- Verify terminal assignments and wiring against the approved cabinet documentation.
- Check the associated power supplies and redundant power paths before energizing the system.
- Ensure that all connections are secure and correctly routed.
- Restore the power system and observe the status of the redundant supply arrangement.
- Verify that the downstream System 800xA equipment receives the expected power condition.
- Investigate abnormal behavior by checking each power source and associated distribution path separately.
- Inspect terminals and wiring during scheduled maintenance for looseness, overheating, or other visible problems.
- After replacement, perform a complete redundant-power functional check before returning the control system to normal operation.
Compatible System Components
| Component | Function |
|---|---|
| ABB System 800xA Power Supplies | Provides control-system power sources |
| Redundant Power Modules | Supplies independent power paths |
| Power Distribution Units | Distributes power to automation equipment |
| System 800xA Controllers | Executes process-control and automation logic |
| System 800xA I/O Modules | Interfaces automation equipment with field signals |
| Control Cabinet | Houses power and automation components |
| Terminal Blocks | Provides power and signal connection points |
| Circuit Protection Devices | Protects associated power circuits |
Recommended Related Models
| Model / Product Family | Product Type | Typical Application |
|---|---|---|
| ABB SS855 | Power Voting Unit | System 800xA redundant power architecture |
| ABB System 800xA Power Supplies | Power Supply Components | Automation system power |
| ABB System 800xA Power Modules | Power Module | Redundant control-system power |
| ABB System 800xA Controllers | Controller | Process and automation control |
| ABB System 800xA I/O | I/O System | Process signal interfacing |
| ABB System 800xA Infrastructure | Automation Infrastructure | Distributed control-system installation |
Key Advantages
- Supports redundant power architectures within System 800xA installations.
- Coordinates multiple power paths within the control-system infrastructure.
- Helps maintain power availability for connected automation equipment.
- Provides a dedicated power-redundancy function separate from process-control logic.
- Suitable for high-availability industrial control environments.
- Simplifies the organization of redundant power paths within control cabinets.
Technical FAQs
What is the purpose of a power voting unit in a redundant control system?
A power voting unit coordinates available redundant power paths and supports the intended power architecture when multiple sources are provided. It forms part of the infrastructure that keeps downstream automation equipment supplied during normal redundant operation.
What equipment should be checked when the SS855 power arrangement shows an abnormal condition?
The incoming power sources, associated power modules, wiring, terminals, distribution paths, and downstream equipment should be checked. Comparing the condition of each redundant power path can help determine whether the issue originates upstream or downstream of the voting unit.
Can the SS855 replace a System 800xA power supply?
The SS855 is a power voting unit rather than a conventional power supply. It works as part of a redundant power architecture and should therefore be evaluated together with the associated power sources and downstream distribution equipment.
What should be verified after replacing an SS855?
Confirm the wiring and redundant power configuration, then energize the system and verify both power paths. The downstream System 800xA equipment should be checked to ensure that the expected supply condition is maintained and that the redundant arrangement responds correctly to the loss of an individual source.