I. Basic Identity Information
Brand: ABB (Swiss original)
Model Abbreviation: B5LA
Part Number: HENF327886R0001
Equipment Type: Dedicated DC switching power supply board / drive power module for ACS800 frequency converter (earlier documentation incorrectly labeled as terminal, excitation, or gateway; manufacturer defines it as an internal power supply board within the inverter)
Compatible Series: ABB ACS800 high-power multi-drive frequency converters
Product Status: Discontinued; new original and used disassembled spare parts available on the market
Core Electrical Specifications
Input: 380–480V AC, 47–63Hz industrial three-phase grid
Standard Output: 24VDC / 10A, adjustable voltage range 22–28VDC
Electrical Performance
Ripple and noise: <150mV p-p
Conversion efficiency ≥93%
Load voltage regulation accuracy ±1%, line regulation ±0.5%
Environmental Specifications
Operating temperature: -20°C to +70°C
Storage temperature: -40°C to +85°C
Protection rating: IP20 (cabinet-mounted), compliant with IEC61000 EMC industrial immunity standards
Hardware Structure and Function
Form Factor: Rack-mount card design, fits standard inverter slot
Internal Components
High-capacity high-voltage electrolytic capacitor filter circuit
LLC resonant power conversion circuit
Auxiliary power supply, short-circuit / overcurrent / overvoltage protection circuits
Panel status indicator lights (power OK, fault alarm)
Core Function
Provides isolated and stable 24V DC power to the main drive board, encoder interface, fiber-optic communication, and I/O terminal cards—serving as the core power distribution unit for the ACS800 multi-drive system. Module failure directly triggers inverter faults such as power loss and drive lockout.
Main Application Scenarios
ABB ACS800 multi-drive production lines, rolling mills, heavy-duty lifting systems
Papermaking, metallurgy, mining, and port heavy-load drive control cabinets
Power plant and petrochemical large-scale redundant servo drive power units
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