DSQC 662 (3HAC026254-001) is the Power Distribution Unit (PDU) for the ABB IRC5 robot controller — the board responsible for managing and distributing electrical power to the internal system components within the IRC5 cabinet.
Ordered under part number 3HAC026254-001 and designated DSQC 662, this compact board weighs 0.42 kg and measures 110 × 165 × 83.5 mm. It operates alongside the DSQC 661 (3HAC026253-001) I/O power supply — while the DSQC 661 supplies the 24V DC logic and I/O rail, the DSQC 662 distributes power across the drive and control domains of the IRC5 architecture.
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What Is the DSQC 662 (3HAC026254-001)?
The DSQC 662 is the power distribution board within the ABB IRC5 controller family. Its function is to route and manage electrical power from the IRC5 mains input stage to the individual subsystems within the cabinet — drive modules, control electronics, and auxiliary circuits.
It is a distinct component from the DSQC 661, which handles the I/O power supply rail exclusively. Understanding this distinction is critical when diagnosing power faults in the IRC5: symptoms affecting I/O modules point to the DSQC 661, while symptoms affecting drive or motor circuits point to the DSQC 662.
The board is confirmed compatible with the IRC5 M2004 Drive Module (3HAC020536-014), the IRC5C Compact Controller Module (9AAC182828), and associated miscellaneous parts (3HAC050778-001), covering the full range of standard IRC5 cabinet configurations.
Key Technical Specifications
- Part Number: 3HAC026254-001
- Secondary Reference: DSQC 662
- ABB Type Designation: DSQC 662 Power Distr Unit
- Function: Power Distribution Unit for ABB IRC5 robot controllers
- Net Weight: 0.42 kg
- Dimensions (L × W × H): 110 × 165 × 83.5 mm
- Compatible Modules: IRC5 M2004 Drive Module (3HAC020536-014), IRC5C Compact Controller (9AAC182828)
- Country of Origin: China (CN)
- Minimum Order Quantity: 1 unit
DSQC 662 vs. Related IRC5 Power Components — Series Comparison
| Model | Part Number | Function | Domain | Compatible System |
|---|---|---|---|---|
| DSQC 661 | 3HAC026253-001 | I/O Power Supply Board | Logic & I/O — 24V DC | IRC5 all variants |
| DSQC 662 | 3HAC026254-001 | Power Distribution Unit | Drive & control domain | IRC5 all variants |
| DSQC 668 | 3HAC029157-001 | Axis Computer | Motion control | IRC5 all variants |
| DSQC 627 | 3HAC13389-2 | I/O Power Supply (predecessor) | Logic & I/O | IRC5 M2000 early |
Data sourced from official ABB manufacturer documentation. Contact Atlantech Drives to verify current availability of specific models.
Typical Industrial Applications
The DSQC 662 is found in all standard IRC5 Single Cabinet and IRC5 Compact installations across a wide range of ABB IRB robot models — including the IRB 1600, IRB 2400, IRB 4400, IRB 6600, and IRB 7600 series.
It is a frequent maintenance replacement in automotive manufacturing lines, where IRC5 controllers operate continuously for years under demanding duty cycles. Welding, material handling, and assembly robot cells are the most common environments where DSQC 662 replacement becomes necessary.
In paint booth applications using the IRC5P (paint) variant, the power distribution architecture may differ — engineers should verify compatibility with ABB technical documentation specific to the IRC5P before ordering.
DSQC 662 Replacement — Compatibility and Installation Notes
The DSQC 662 (3HAC026254-001) is a direct spare part for the IRC5 M2004 Drive Module (3HAC020536-014) and IRC5C Compact Controller configurations. No software configuration is required after physical replacement — the IRC5 system recognises the board automatically on restart.
When replacing the DSQC 662, always power down the IRC5 controller fully and follow the lockout/tagout procedure before opening the cabinet. The board handles mains-level power distribution — working on it with residual charge in the capacitor bank is a serious safety risk. Allow a minimum of 5 minutes after power-off before touching internal components.
If the replacement DSQC 662 does not resolve the fault, check the upstream transformer tap setting and the rectifier unit — these are the most common adjacent failure points when the DSQC 662 appears to have failed. A full power path test from mains input through the transformer, rectifier, and DSQC 662 to the drive modules takes less than 30 minutes with a calibrated multimeter and prevents unnecessary board replacements.
Troubleshooting Guide
DSQC 662 faults typically appear as drive-domain power failures: the IRC5 generates drive unit power fault errors, specific axes lose torque while others remain active, or the cabinet shows signs of power imbalance across motor circuits.
Before replacing the DSQC 662, verify that the fault is not originating in the DSQC 661 — I/O power faults and drive power faults produce different error code ranges in the IRC5 event log. Checking the event log first saves significant diagnostic time.
Inspect the DSQC 662 visually for burn marks, damaged connectors, or bulging capacitors. Any of these confirm board failure without further testing. If the board shows no visible damage, measure the output voltages at the distribution terminals with the cabinet powered — out-of-tolerance readings confirm internal board failure.
Frequently Asked Questions
Q: What is the difference between the DSQC 661 and DSQC 662 — can they replace each other?
A: No. The DSQC 661 (3HAC026253-001) supplies 24V DC specifically to the IRC5 logic and I/O modules. The DSQC 662 (3HAC026254-001) manages power distribution to the drive and control domains. They perform entirely different functions within the same cabinet and are not interchangeable.
Q: Does the DSQC 662 require any parameter configuration in RobotStudio after replacement?
A: No. The DSQC 662 is a hardware power distribution component with no configurable parameters. Once physically installed and the cabinet powered on, the IRC5 system operates normally without any software changes.
Q: Is the DSQC 662 (3HAC026254-001) compatible with the IRC5C Compact controller?
A: Yes. The 3HAC026254-001 is confirmed compatible with the IRC5C Compact Controller Module (9AAC182828) in addition to the standard IRC5 M2004 Drive Module (3HAC020536-014).
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