ABB DSQC 661 Power Supply 3HAC026253-001 for IRC5 Controller

IRC5 Power Supply Module — Technical Overview

This module generates the 24 V DC rail that runs the logic and I/O side of an ABB IRC5 controller. ABB catalogues it for both the standard IRC5 Single cabinet and the IRC5C Compact controller, and lists it as a spare part for the IRC5 M2004 drive module and the IRC5C Compact controller module. It is a hardware-only unit: there is no software configuration, parameter setting or fieldbus addressing involved in replacing it.

Specifications

Industrial Applications

• IRC5 Single cabinet controllers — the standard single-cabinet IRC5 installation.
• IRC5C Compact controller cabinets — the compact controller used where cell floor space is limited. ABB lists this module under both cabinet families, which is not true of every IRC5 supply.
• Cells with a heavy field I/O load — grippers, sensors, solenoid valves and safety devices hanging off the 24 V rail.
• Emergency recovery after a power fault — when the controller has logic or I/O problems but the drives are healthy, this is the supply to check first.
• Planned cabinet refurbishment and fleet spares — power supplies age with heat and running hours, so they are commonly replaced preventively or held on the shelf.

Design Purpose

ABB splits the IRC5 power architecture into generation and distribution instead of using one large supply. This module does the generation: it produces the 24 V DC rail that the logic and I/O side of the controller runs on. The DSQC 662 then distributes power across the drive and control domains. Keeping those functions apart is what makes an IRC5 power fault locatable — the symptom pattern tells you which half of the supply chain to look at.

That split gives maintenance a useful rule of thumb. Faults that show up on I/O, sensors or logic point at this module; faults that show up on drives or motor circuits point at the distribution side. Before condemning the module, though, it is worth knowing that it behaves differently unloaded: it needs at least a 2 A load before it will regulate to +24 V. A supply tested on a bench with nothing connected can look healthy or look faulty for the wrong reason, so ABB's own procedure measures the output with the DSQC 662 or an equivalent load attached.

Common Failure Modes

Check these upstream items first, in the order ABB's own procedure uses:

• Incoming supply outside 172–276 V AC — measure at input connector X1 before anything else.
• Q1-2 switches open, or main fuse F2 / optional fuse F6 blown — the usual upstream causes of a "failed" power supply.
• Transformer T1 or the input filter — check the cabling and these components if the input voltage is wrong but the cabinet supply is correct.

Symptoms that point to the module itself:

• DC OK indicator off with a correct input voltage present.
• No output, or an output outside +24 V to +27 V, measured at connector X2 under load.
• Voltage correct at the module but low at the load — voltage drop in the cables and connectors rather than a failed supply.
• I/O devices drop out while the controller keeps running — the 24 V rail is failing while the rest of the cabinet is still powered.
• Intermittent resets when field devices switch in — the rail sags as I/O load comes on.
• Reads healthy unloaded, collapses under load — worth remembering the 2 A minimum load requirement before drawing conclusions.
• Physical signs — a sharp smell, discoloured or warped housing, or heat damage around the terminal block.

Why Choose Us

• Genuine ABB part, supplied against part number 3HAC026253-001.
• Part number and cabinet type checked with you before dispatch, so the module matches the IRC5 Single or IRC5C Compact cabinet it is going into.
• New original or used original available — the condition is confirmed with you before you order.
• Photos and label details of the actual module provided on request, so you can compare the terminal layout and identifier against your existing unit.
• Help telling DSQC 661 and DSQC 662 apart. They are adjacent part numbers with different jobs, and ordering the wrong one is a common and expensive delay.
• Packed with rigid support to protect the housing and terminal block in transit; ships worldwide from Shanghai.
• PayPal, T/T bank transfer and Alibaba Trade Assurance accepted.

Related Products

• 3HAC026254-001 — DSQC 662 Power Distribution Unit. This is not an alternative to the DSQC 661: the 661 generates the 24 V DC logic and I/O rail and the 662 distributes power across the drive and control domains. Check which one your fault pattern points to before ordering.
• 3HAC12928-1 — DSQC 604 Power Supply, catalogued for IRC5 Single cabinets.
• 3HAC025097-001 — DSQC 639 Main Computer for IRC5.
• 3HAC028357-001 — DSQC 679 FlexPendant for IRC5.
• 3HAC029818-001 — DSQC 663 Main Drive Unit for the IRC5 drive system.