Brief Product Description

ABB DSSR122M, part number 48990001-LR, is a high-reliability DC power supply module designed for ABB AC800PEC and power electronic converter control systems. This rack-mounted power module converts the input AC voltage into stable regulated DC power to feed the controller, signal boards and peripheral circuits inside the converter cabinet. It integrates overvoltage, overcurrent, overheating and short-circuit protection functions, with status LED indicators for operational and fault diagnosis. Built to withstand vibration and temperature fluctuations inside high-power converter cabinets, it provides continuous, clean power for critical power electronic control loops. As a legacy spare component, it is supplied as fully-tested surplus and refurbished units for maintenance and retrofit of existing ABB power conversion systems.

Core Product Functions

• AC to DC power conversion to supply stable operating voltage for ABB AC800PEC control rack internal boards
• Built-in comprehensive protection: overvoltage, overcurrent, overtemperature and short-circuit auto-protection
• Front panel LED indicators for power-on status, running state and fault alarm visual monitoring
• Filter circuit design to suppress power noise and voltage spikes, protecting sensitive control electronics
• Standard rack slot mounting form factor for seamless installation inside ABB power electronic cabinets
• Fast automatic shutdown mechanism triggered by faults to avoid secondary damage to adjacent control modules
• Wide operating temperature range, suitable for continuous operation in industrial converter cabinet environments
• Provide isolated power output to reduce interference between power circuit and control signal circuit

• Work cooperatively with other modules in the AC800PEC system to guarantee stable converter operation

Application Scenarios

• ABB AC800PEC high-power power electronic control systems and medium voltage converter racks
• Metallurgical industry rectifier systems and large potline power conversion control cabinets
• Oil & gas, petrochemical heavy-duty medium voltage drive and power conversion equipment
• Power plant large compressor, fan medium voltage variable frequency drive control cabinets
• Renewable energy inverter and power quality compensation device control racks
• Spare replacement power module for maintenance, troubleshooting and retrofit of legacy ABB converter systems

FAQ (Frequently Asked Questions)

• Q: Control rack cannot power up after installing DSSR122M 48990001-LR?
  A: Check input AC power, wiring terminal tightness, output short-circuit condition, module fuse status and LED fault indication.
• Q: Can this module be hot swapped while the converter cabinet is energized?
  A: No, hot-swap is not supported. Cut off the power and wait for discharge before removing or installing this power supply module.
• Q: Can DSSR122M be used for other ABB DCS or non-AC800PEC systems?
  A: It is specially matched for AC800PEC power converter racks; output voltage and mechanical size limit cross-platform use.
• Q: What happens if the module reports over-temperature alarm?
  A: Check cabinet cooling fan operation, air filter blockage, ambient temperature and dust accumulation on the module surface.
• Q: Is ABB DSSR122M 48990001-LR available for brand-new converter projects?
  A: This legacy power supply module has reached end-of-life. Only fully-tested surplus and refurbished units are offered for existing-site maintenance and retrofit tasks.