ABB DSQC661 3HAC026253-001 – IRC5 Robot Controller Logic Power Supply Unit

Description

3HAC026253-001 (catalogued as DSQC661) is a power supply unit manufactured by ABB for the IRC5 robot controller platform. This module generates the 24V DC rail that powers the control-side electronics within the IRC5 cabinet, including the main computer, panel unit, FlexPendant interface, safety board, and I/O modules.

The DSQC661 functions as the “generation” half of ABB’s split power architecture—it produces the 24V DC output, while the companion DSQC662 power distribution unit handles the distribution across drive and control domains. The 3HAC026253-001 is listed as a spare part for both the IRC5 Single cabinet and the IRC5C Compact controller, making it a versatile power module across multiple IRC5 configurations.

Application Scenarios

In an automotive body welding line, multiple ABB IRB 6600 robots operate under IRC5 dual-cabinet controllers. When one controller suddenly froze—teach pendant unresponsive, I/O indicators dark, but servo drives still powered—maintenance technicians initially suspected a drive fault. Systematic troubleshooting revealed the root cause: the 3HAC026253-001 DSQC661 power supply had failed, cutting all 24V DC control-side power.

This scenario illustrates a critical operational insight: DSQC661 failure manifests as complete control-side blackout while the servo drive side may remain energized, creating the confusing symptom of a “frozen robot with live drives.” Keeping a spare 3HAC026253-001 on the shelf is standard practice in ABB robot fleets—the board’s five-minute swap time and two-minute fault isolation make it one of the most practical spare parts to stock. For production lines where every minute of downtime carries cost, the DSQC661 represents a high-impact, low-complexity insurance component.

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