ABB DSSB-01C 68300746C Replacement for ACS800 Series

Product Overview

ABB DSSB-01C 68300746C Replacement for ACS800 Series: Smooth Transition & Legacy System Compatibility

The ABB DSSB-01C (part number 68300746C) is the Drive Supply Unit (DSU) Control Board designed for the ACS800 series of AC drives. For facilities running ACS800 multi-drive or single-drive cabinets, this board governs the supply unit’s control logic, gate firing sequences, and DC bus regulation. When the original DSSB-01C fails or reaches end-of-service life, unplanned downtime can cascade across the entire drive line. TOPNLMS stocks tested, verified DSSB-01C 68300746C boards ready for immediate dispatch, enabling your maintenance team to execute a controlled, low-risk replacement without waiting weeks for OEM lead times.

The ACS800 platform has been widely deployed in heavy industry — pulp and paper, metals, oil and gas, water treatment, and marine applications — since the early 2000s. Many installations are now entering their second or third decade of operation. The DSSB-01C is a critical wear item in these aging systems: capacitor degradation, IGBT gate driver faults, and firmware-related supply unit trips are the most common failure modes. A direct board swap restores full DSU functionality without requiring a full drive replacement, preserving your existing cabinet wiring, motor cabling, and control architecture.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful ACS800 DSU board replacement rarely involves the DSSB-01C in isolation. In practice, your maintenance team will likely interact with several adjacent components during the retrofit. The AINT-02 or AINT-14 inverter control board, which handles the inverter section of the ACS800, is often inspected or replaced concurrently when the supply unit is taken offline — both boards share the same DC bus and a fault in one frequently stresses the other. Similarly, the APBU-44C or APBU-12C pulse encoder and branching unit board distributes gate pulses to the IGBT modules and should be verified for integrity before commissioning the new DSSB-01C.

Communication continuity is another key concern. The ACS800’s DDCS fiber-optic network relies on the RDCO-02 or RDCO-04 communication option board to link the drive to a master controller or fieldbus adapter. If your system uses PROFIBUS, the RPBA-01 PROFIBUS adapter, or for MODBUS RTU applications the RMBA-01 adapter, these modules connect through the RDCO layer and must be confirmed operational after the DSU board swap. Customers migrating from older ACS600 installations to ACS800 architecture frequently need to re-map their DDCS node addresses and verify that the NAMC-11 or NAMC-03 application control board parameters are correctly restored.

On the power side, the SNAT 7610 TAI or equivalent auxiliary power supply board within the ACS800 cabinet provides the 24 VDC rail that feeds the DSSB-01C. A degraded auxiliary supply is a common root cause of repeated DSU control board failures and should be load-tested before the replacement board is installed. For multi-drive systems using an ACSM1 or ACS850 inverter module alongside an ACS800 supply unit, the inter-drive communication cabling and the BAMU branching and monitoring unit should also be inspected as part of the upgrade scope.

Finally, for sites performing a full cabinet retrofit, the NINT-41 or NINT-72 inverter module interface board and the associated fiber-optic patch cables between the DSSB-01C and the IGBT gate driver boards are consumable items that benefit from replacement at the same service interval, reducing the probability of a repeat outage within the warranty period.

Retrofit Guidance FAQ

Q: Does replacing the DSSB-01C require any rewiring of the supply unit cabinet?
A: No. The DSSB-01C 68300746C is a direct board-level replacement. All connectors — ribbon cables, discrete signal connectors, and fiber-optic links to the RDCO module — are pin-compatible with the original. No cabinet rewiring is required. Disconnect power, remove the faulty board, seat the replacement, and reconnect all cables in the original positions.

Q: How do I restore drive parameters after the board swap?
A: ACS800 DSU parameters are stored in the DSSB-01C’s onboard memory. Before removing the faulty board, upload a parameter backup using ABB DriveWindow Light or the CDP control panel if the drive is still partially functional. After installing the replacement board, download the saved parameter set. If the original board is completely non-functional, parameters must be re-entered manually from your commissioning records or the drive’s nameplate data.

Q: Is the DSSB-01C compatible with both single-drive and multi-drive ACS800 configurations?
A: Yes. The DSSB-01C serves as the DSU control board in both ACS800 single-drive units and ACS800 multi-drive supply units. Verify your specific drive type code (e.g., ACS800-104, ACS800-304) against ABB’s hardware manual to confirm the board revision matches your cabinet generation.

Q: What communication protocols does the ACS800 DSU support after this replacement?
A: The DSSB-01C itself manages the supply unit control logic; fieldbus communication (PROFIBUS, MODBUS, DeviceNet, Ethernet/IP) is handled by the option board installed in the inverter section (RPBA-01, RMBA-01, RDNA-01, etc.). The DSU board replacement does not affect fieldbus configuration. DDCS fiber-optic communication between the DSU and the master controller is restored immediately after the board swap and parameter restore.

Q: Will the replacement board fit in the existing cabinet space?
A: Yes. The TOPNLMS DSSB-01C 68300746C is dimensionally identical to the OEM board. No bracket modification, DIN rail adjustment, or cabinet spacer is required. The board mounts in the same position and orientation as the original.

Q: What is the typical commissioning time after installation?
A: For an experienced drive technician with a parameter backup available, commissioning typically takes 1–3 hours including power-up checks, parameter restore, and a no-load test run. Sites without a parameter backup should budget additional time for manual parameter entry and motor identification run.

Warranty Assurance

Every DSSB-01C 68300746C shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Before dispatch, each board undergoes a functional verification process: visual inspection for physical damage, connector integrity check, and a power-on test to confirm the board initializes correctly and passes self-diagnostics. Boards that do not pass verification are not shipped.

If a warranty claim arises within the 12-month coverage period, TOPNLMS will provide a replacement board or issue a refund based on the fault assessment. Our after-sales team responds to warranty inquiries within one business day. For urgent production-down situations, we prioritize expedited dispatch of the replacement unit to minimize your facility’s downtime exposure.

We ship from Xiamen, China, with DHL Express, FedEx International Priority, and UPI available as carrier options. Most destinations in Asia, Europe, and the Americas receive shipments within 3–7 business days. Export documentation, commercial invoices, and packing lists are provided with every shipment to support customs clearance.

TOPNLMS maintains stock of ACS800-series components specifically to support maintenance teams operating legacy installations where OEM supply has been discontinued or lead times are unacceptable. Our procurement team sources boards through verified industrial surplus and refurbishment channels, and all units are tested before listing.

For volume orders, spare parts kits, or technical pre-sales consultation, contact our team directly.