DSQC 661 (3HAC026253-001) is the dedicated I/O power supply board for ABB IRC5 robot controllers, engineered to deliver stable 24V DC power to all input/output modules within the IRC5 control cabinet ecosystem.
Designated internally as the DSQC 661 and ordered under part number 3HAC026253-001, this unit functions as a secondary power distribution stage, converting incoming line voltage into regulated DC outputs required by the controller’s main computer, I/O system, and auxiliary logic circuits.
With a net weight of 2.46 kg and compact dimensions of 235 × 178 × 104 mm, it integrates directly into the IRC5 standard bus architecture. Atlantech Drives supplies the DSQC 661 (3HAC026253-001) with an estimated lead time of 1–2 weeks.
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What Is the DSQC 661 (3HAC026253-001)?
The DSQC 661 is a hardware-layer power component within the ABB IRC5 controller family — the generation of robot controllers introduced by ABB for the IRB series including IRB 1600, IRB 2400, IRB 4400, IRB 6600, and IRB 7600 manipulators.
Its role is critical: without a functioning DSQC 661, the IRC5 cabinet cannot supply the stable 24V DC rail that all digital and analog I/O modules depend on.
The board features robust EMI filtering, integrated overcurrent protection, and overvoltage protection circuitry designed for industrial-grade reliability in volatile electrical environments. Unlike the main drive power supply (DSQC 662), which handles motor drive circuits, the DSQC 661 is exclusively responsible for the logic and I/O power domain — making it a frequent maintenance target in aging IRC5 installations where I/O errors or unexpected system reboots occur.
Key Technical Specifications
- Part Number: 3HAC026253-001
- Secondary Reference: DSQC 661
- Function: I/O Power Supply Board for ABB IRC5 controller
- Output Voltage: 24V DC (stabilised, to I/O modules)
- Compatible Controller: ABB IRC5 (all variants)
- Net Weight: 2.46 kg
- Dimensions (D × W × H): 235 × 178 × 104 mm
- Country of Origin: China (CN)
- Customs Tariff Number: 85044083
- Warehouse Locations: Menden, Germany; Shanghai, China
- Minimum Order Quantity: 1 unit
DSQC 661 vs. Similar IRC5 Power Supply Modules — Series Comparison
| Model | Part Number | Function | Output | Domain | Compatible System |
|---|---|---|---|---|---|
| DSQC 661 | 3HAC026253-001 | I/O Power Supply | 24V DC | Logic & I/O | IRC5 all variants |
| DSQC 662 | 3HAC025917-001 | Drive Power Supply | — | Motor drives | IRC5 all variants |
| DSQC 627 | 3HAC13389-2 | I/O Power Supply (predecessor) | 24V DC | Logic & I/O | IRC5 M2000 (early) |
| DSQC 652 | 3HAC14265-1 | Digital I/O Board | — | I/O expansion | IRC5 all variants |
Data sourced from official ABB manufacturer documentation. Contact Atlantech Drives to verify current availability of specific models.
Compatibility & System Integration
The DSQC 661 (3HAC026253-001) is compatible with all IRC5 controller variants including the IRC5 Single Cabinet, IRC5 Compact, and IRC5 Panel Mounted Controller.
It operates on the IRC5 internal bus architecture and interfaces with the DSQC 652 digital I/O board, DSQC 651 analog I/O board, and all DSQC 1000-series fieldbus adapters.
Before installation, engineers must verify that the upstream transformer stage is correctly tapped for local factory voltage — the IRC5 transformer typically offers 200V, 380V, 400V, and 480V taps. The DSQC 661 itself receives the stepped-down AC input from this transformer; if the tap is incorrectly set for the local grid voltage, the 24V DC output will be out of tolerance even with a new, functional DSQC 661 installed.
This is the most common cause of repeat failures after replacing the board.
DSQC 661 as a Replacement for DSQC 627 — Compatibility Notes
In early IRC5 M2000 installations, the I/O power supply function was handled by the DSQC 627 (3HAC13389-2). The DSQC 661 (3HAC026253-001) was introduced as the revised standard part and is the current ABB service replacement for all IRC5 I/O power supply requirements.
Mechanically, the DSQC 661 shares the same mounting format as the DSQC 627, allowing direct replacement without cabinet modification in most IRC5 configurations. No software configuration is required after replacement — the DSQC 661 is a hardware-layer component; once terminal blocks are reconnected and the cabinet is powered, the IRC5 system will automatically recognise the stabilised 24V DC rail.
Engineers replacing a DSQC 627 with a DSQC 661 should confirm the firmware revision of the IRC5 main computer (DSQC 679 or DSQC 1000) is at a revision level that supports the updated board — ABB recommends RobotWare 5.12 or later for full compatibility. Compatibility with non-standard IRC5 configurations should be verified with ABB technical support before installation.
Troubleshooting Guide
The DSQC 661 is the primary diagnostic suspect whenever an IRC5 system generates «Low Voltage» warnings on the FlexPendant, experiences unexpected system reboots during high-load operations, or shows erratic I/O behaviour across multiple modules simultaneously.
Follow this diagnostic sequence before replacing the board:
Step 1 — Measure the 24V DC output directly at the DSQC 661 terminal block with a calibrated multimeter.
Acceptable range is 23.5V to 25V DC; readings outside this range confirm board failure.
Step 2 — Check the internal status LEDs on the DSQC 661 face.
If LEDs fail to illuminate upon mains power activation, the internal fuse or switching circuit has reached end-of-life.
Step 3 — Before condemning the DSQC 661, verify the upstream transformer tap setting matches local grid voltage. A correctly set tap producing 24.8V DC at the DSQC 661 input rules out transformer issues.
Step 4 — Inspect the 24V DC distribution fuses on the Power Distribution Board downstream of the DSQC 661; a blown fuse creates symptoms identical to DSQC 661 failure but requires a different repair action. Do not reset the IRC5 controller repeatedly if the DSQC 661 LEDs are dark — repeated cold-start cycles with an open switching circuit can damage downstream I/O modules.
Frequently Asked Questions
Q: Can the DSQC 661 (3HAC026253-001) be used to replace a DSQC 627 in an older IRC5 M2000 cabinet without mechanical modification?
A: In most cases, yes — the DSQC 661 uses the same mounting format as the DSQC 627. However, engineers should verify the RobotWare version running on the IRC5 main computer is 5.12 or later before installation, and confirm the transformer tap is correctly set for local voltage. No software configuration is required post-replacement.
Q: Does the DSQC 661 require any parameter configuration in RobotStudio after installation?
A: No. The DSQC 661 is a hardware power supply component with no configurable parameters in RobotStudio or the FlexPendant. Once the input and output terminal blocks are securely reconnected and the cabinet is powered, the IRC5 system recognises the stabilised 24V DC rail automatically. Configuration is only required if simultaneously replacing I/O modules or fieldbus adapters.
Q: What is the difference between the DSQC 661 and the DSQC 662 — can they be interchanged?
A: No. Despite being part numbers within the same IRC5 power supply family, they serve entirely different domains. The DSQC 661 (3HAC026253-001) supplies 24V DC to the logic and I/O modules. The DSQC 662 (3HAC025917-001) is the drive power supply handling motor drive circuits. They are not interchangeable and perform distinct functions within the IRC5 cabinet architecture.
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