ABB DSSB-01C 68300746 DSU Main Control Unit

The ABB DSSB-01C with spare part number 68300746 is the dedicated main control unit for DSU rectifier modules of ACS800 series variable frequency drives. It executes rectifier closed-loop control logic, collects voltage and current feedback signals, and generates trigger commands for power semiconductor components inside the rectifier unit.

This control board adopts robust industrial PCB design with built-in multi-level hardware protection. It communicates with inverter control units through internal bus to realize coordinated rectifier-inverter operation. Widely used for ACS800 drive cabinet maintenance, equipment renovation and spare parts stocking in heavy industrial sites.

Main Specifications

• Brand: ABB
• Model: DSSB-01C, Part No. 68300746
• Application: DSU Rectifier Unit Controller for ACS800 series drives
• Power Supply: 24 VDC auxiliary control power
• Signal Interface: Analog sampling port, fiber communication interface
• Built-in Protection: Overvoltage, overcurrent and over-temperature protection logic
• Operating Temperature: -20°C ~ +60°C
• Humidity Range: 0~95% non-condensing
• Enclosure: Standard metal shielding housing for cabinet installation
• Origin: Finland / Estonia

Core Functions

• Real-time sampling of AC input voltage, DC bus voltage and current signals
• Execute phase-controlled rectification algorithm to stabilize DC bus voltage
• Generate trigger control signals for rectifier thyristor power modules
• Data exchange with inverter control board via internal high-speed communication bus
• Detect abnormal operating conditions and activate protection interlock instantly
• Record operation event logs and fault alarm information locally
• Onboard LED indicators displaying running status and fault codes
• Support online parameter configuration and drive debugging work
• Metal shielding structure suppresses electromagnetic interference in cabinet
• Standard plug-in structure for convenient on-site disassembly and replacement

Application Scenarios

• Metallurgical industry ACS800 medium and high power frequency converter cabinets
• Thermal power plant boiler fan, water pump variable speed drive equipment
• Mining plant conveyor and crusher heavy-duty motor control systems
• Cement factory rotary kiln and raw material mill ACS800 drive units
• Oil & gas field large pump and compressor variable frequency control projects
• Pulp and paper production line main drive rectifier control cabinets
• Port crane, hoist ACS800 drive system maintenance and upgrade
• Chemical factory continuous production heavy load motor drive equipment
• Old ACS800 DSU rectifier unit spare parts replacement project
• Heavy industry medium voltage variable frequency drive system transformation