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ABB  DSSR122 48990001-NK

The ABB DSSR122 (48990001-NK) is a dedicated DC-input/DC-output power supply unit designed for ABB industrial control systems, especially the ABB Advant Master / Advant OCS process control platforms. It provides a stable 5 VDC regulated power source for control racks, supplying power to CPU modules, I/O modules, and communication modules. 

As a critical power component in legacy ABB DCS installations, the DSSR122 ensures reliable operation of automation systems in continuous industrial environments. 

Product Parameters

Core Function

The main function of the ABB DSSR122 is to convert an external 24V DC input into a stable 5V DC regulated output for ABB control system racks. 

Its core functions include:

• Providing high-current 5V DC power for DCS rack backplanes
• Supporting ABB Advant Master controller and I/O assemblies
• Maintaining stable voltage supply for sensitive electronic modules
• Protecting connected automation hardware against abnormal electrical conditions
• Improving overall system availability in continuous process applications

Design Features

High-Reliability DC/DC Conversion

The DSSR122 uses industrial-grade DC/DC conversion technology to deliver stable low-voltage power from a 24V DC supply source, suitable for demanding automation environments. 

High Output Capability

With a 5V / 40A output rating, the module can provide sufficient power for a fully configured control rack containing multiple ABB processing and I/O modules. 

Industrial Protection Design

Built-in protection functions help prevent damage caused by:

• Output overload
• Short circuits
• Voltage fluctuations
• Excessive operating conditions

Rack Integration

The compact rack-mounted design allows direct integration into ABB Advant control system cabinets, reducing wiring complexity and improving maintenance efficiency.

Hardware Composition

The ABB DSSR122 power supply unit typically consists of:

• DC input interface
• DC/DC conversion circuit
• 5V regulated output stage
• Power monitoring and protection circuits
• Cooling and ventilation structure
• Rack mounting interface
• Internal fuse protection system

It is designed as a dedicated spare module for ABB process control system installations.

Application Scenarios

Typical applications include:

Process Control Systems

• Oil & gas production facilities
• Petrochemical plants
• Power generation plants
• Chemical processing systems

Industrial Automation

• ABB Advant Master DCS systems
• ABB Advant OCS control cabinets
• Legacy ABB AC400 / AC410 / AC460 automation platforms

System Maintenance and Upgrade Projects

• Replacement of failed rack power supplies
• DCS lifecycle extension projects
• Obsolete ABB system repair and modernization 

Maintenance Points

To ensure reliable operation:

• Verify 24V DC input voltage stability before installation
• Check output 5V voltage level regularly
• Inspect cooling airflow inside control cabinets
• Replace damaged fuses with the correct specification
• Avoid operating beyond the rated 40A output capacity
• Keep spare DSSR122 units available for critical ABB DCS systems

Because the DSSR122 belongs to an older ABB automation platform, replacement availability should be confirmed before planned maintenance shutdowns.

Comprehensive Evaluation

The ABB DSSR122 48990001-NK is a reliable industrial DC power supply module designed for ABB Advant Master and related DCS systems. With its 24VDC input, 5VDC/40A regulated output, and rack-mounted design, it plays an essential role in maintaining stable operation of ABB control systems. 

Although it is mainly found in legacy ABB installations and may no longer be part of current production ranges, it remains an important spare part for DCS maintenance, system refurbishment, and long-term operational support projects.