Product Overview

The ABB DSSR 122 (DSSR1229K 4899 0001-NK) Power Supply Unit operates as a dedicated hardware component for signal processing or control execution within industrial automation architectures. This module is engineered to provide regulated DC power output for rack-mounted automation systems, specifically designed to interface with Distributed Control Systems (DCS). It serves to convert fluctuating DC input voltages into a stable, filtered power source for electronic modules, ensuring the integrity of low-voltage logic circuits and communication interfaces within the rack environment.

Technical Specifications

Brand-Specific Technical Block

The ABB DSSR 122 is designed for seamless integration within ABB industrial rack architectures. The unit utilizes passive and active filtering to mitigate the effects of backplane electrical noise often found in high-density I/O configurations. It maintains regulation across the specified 18–30 V DC input range, supporting the voltage requirements of backplane-mounted I/O modules and communication processors. The module’s mechanical design includes structural reinforcements for vibration resistance, ensuring consistent electrical contact during operation within standard industrial enclosures.

Ordering Information

• Included items: Power Supply Module, terminal block connectors.

• Standard package: Industrial anti-static sealed packaging.

• Optional accessories: Rack mounting hardware, cable management harness.

Installation Guidelines

• Ensure the power supply is mounted in a vertical orientation to facilitate convection cooling through the heat sink.

• Connect the input DC source using shielded copper conductors to minimize electromagnetic interference (EMI).

• Verify that the rack backplane is properly grounded to a common station earth to prevent ground loops.

• Maintain a minimum clearance of 5 cm above and below the module for thermal dissipation.

• Ensure the module is fully inserted and the mechanical locking mechanism is engaged to establish a secure backplane connection.

• Do not exceed the rated 40 A output current to prevent thermal shutdown of the internal protection circuitry.

Frequently Asked Questions

Q: Does this unit support hot-swap functionality?

A: The DSSR 122 is designed for rack-mount integration; refer to the specific system backplane documentation to confirm hot-swap capability in your current configuration.

Q: How does the unit handle backplane load variations?

A: The internal regulation circuitry is designed to maintain a constant 5 V output despite fluctuations in backplane load current up to the 40 A limit.

Q: Is this module capable of redundant power configurations?

A: Redundancy is dependent on the host system backplane design; check if your system supports parallel power input architectures.

Q: What is the primary method of cooling for this unit?

A: The unit utilizes natural convection cooling through its chassis heat sink; ensure adequate airflow in the rack.

Q: Does the unit provide signal isolation?

A: The module provides galvanic isolation between the input DC source and the regulated 5 V DC output bus.

Q: Are there specific wiring constraints for the input terminals?

A: Input conductors must be sized according to local electrical codes for a maximum current draw at the lowest input voltage (18 V DC).

Q: Can this unit be used with non-ABB backplanes?

A: The unit is designed for proprietary ABB rack architectures; compatibility with third-party backplanes is not verified.

Q: What protection is activated during a short circuit?

A: The unit features electronic current limiting that disables the output until the short-circuit condition is removed.

Q: Is external surge protection required?

A: While the unit includes internal protection, external surge suppression is recommended if the DC source is susceptible to significant transients.