Application ScenariosIn a 24-hour automotive body-welding shop running twelve IRB 6600 cells on IRC5 Dual cabinets, a Friday night shift supervisor noticed the FlexPendant flickering and the “Power Supply Fan” warning popping on one cabinet’s RobotStudio event log. Instead of stopping the line, the maintenance lead verified the second ABB DSQC661 in the N+1 redundant pair was carrying the load, then hot-swapped the degraded unit during the 15-minute tool-change window—no robot reboot, no production loss. That’s exactly the design intent: the ABB 3HAC026253-001 DSQC661 uses a digital control loop that compensates for motor-brake release and I/O scan current spikes in milliseconds, and its redundant parallel architecture means a single-module failure never forces a cabinet shutdown. For plants sitting on fleets of IRC5 M2004-era robots, the DSQC661 is one of those “quiet workhorse” spares that suddenly becomes mission-critical the day a cooling-fan bearing starts growling—and because the DSQC661 and DSQC662 look nearly identical in photos but serve completely different roles (PSU vs. PDU, not interchangeable), having the correct 3HAC026253-001 part number on the PO avoids an expensive return.h2
Parameters
| Main Parameters | Value / Description |
|---|---|
| Product Model | DSQC661 (Order No. 3HAC026253-001) |
| Manufacturer | ABB Robotics |
| Product Category | System Power Supply Module (PSU) – Logic Rail |
| Input Voltage | 85–264 V AC (47–63 Hz) or 120–370 V DC, wide-range |
| Output Voltage | 24 V DC ±2% (precision ±0.5 V) |
| Rated Output Current | 10 A continuous / 12 A peak |
| Output Ripple | < 50 mV (full load) |
| Redundancy | Dual-module parallel N+1, hot-swappable |
| Protection | Over-voltage, over-current, short-circuit, over-temperature |
| Cooling | Internal temperature-controlled fan |
| Communication | IRC5 backplane bus (diagnostic upload to RobotStudio) |
| Operating Temp. | 0 to +50 °C (full load), up to +55 °C derated |
| Efficiency | ≈ 89% typical |
| Certifications | CE, UL, CSA, IEC 60204-1, IEC 61000-6-2/4 |
h2 Technical Principles and Innovative ValuesInnovation Point 1 – N+1 Redundant Parallel Architecture. Two ABB DSQC661 modules can share a common 24 V logic rail in parallel; if one fails, the survivor picks up the full load without voltage sag. This is what lets welding and paint shops run 24/7 without scheduling a “power-down maintenance window” for PSU replacement.Innovation Point 2 – Digital Compensation for Robotic Load Transients. Robot applications have brutal current profiles—motor brake release, I/O scan bursts, contactor coil inrush all happen in tens of milliseconds. The ABB 3HAC026253-001 DSQC661 uses a digitally controlled regulation loop that holds 24 V ±2% through these spikes, preventing spurious “undervoltage” trips on the FlexPendant or safety board.Innovation Point 3 – Backplane Diagnostic Visibility. Through the IRC5 backplane, the DSQC661 pushes fan-speed alerts, over-temperature warnings, and output-voltage drift data into RobotStudio event logs. Maintenance shifts from “the robot won’t boot—guess which PSU” to “PSU slot A fan at 70%, plan swap next weekend.”Innovation Point 4 – Hot-Swap Without Process Interruption. The metal enclosure and guided-insertion connector design let a technician pull a faulty ABB DSQC661 while the partner module carries the rail—provided the cabinet is in redundant configuration. For continuous-process lines (injection molding, press shop, stamping), this is the difference between a five-minute swap and a four-hour restart.Innovation Point 5 – Wide-Input Tolerance for Globally Deployed Lines. With 85–264 V AC auto-range, the same DSQC661 drops into IRC5 cabinets in Europe (230 V), North America (120 V), and Asia (200–240 V) without DIP-switch changes—handy for OEMs shipping the same robot cell to multiple regions.
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