I. Basic Information

Product Positioning

Hardware Architecture

1. Dual-core High-speed Processing Unit: DSP executes closed-loop regulation algorithms such as DTC and AVR, FPGA realizes hardware time sequence synchronization and fault logic judgment, equipped with 16MB non-volatile storage for programs, parameters and fault records.
2. Multi-channel Isolated Optical Fiber Communication Unit: Multiple DDCS fiber interfaces realize complete galvanic isolation between low-voltage control side and high-voltage power side, realizing bidirectional real-time transmission of drive commands and power unit operating status.
3. Hardware Fault Interlock & Diagnosis Unit: Integrated DESAT short-circuit, under-voltage, fiber break and over-temperature protection circuits, which can block all gate drive pulses within microseconds and latch fault information to prevent power device breakdown and bridge arm shoot-through faults.
4. Backplane Bus & Isolated I/O Unit: Obtains DC24V working power through the rack backplane, collects field interlock switching signals and outputs fault trip and alarm instructions to realize safety logic control of industrial secondary circuits.
5. Rack-mounted Reinforced Structure Unit: Standard slot installation design with good vibration resistance and heat dissipation performance, suitable for dense layout in closed industrial control cabinets.

Mounting Specifications

• Power Supply: DC 24V via rack backplane, typical power consumption ≤10W
• Processor: 32-bit industrial DSP + FPGA
• Memory: 16MB Flash non-volatile storage
• Communication: Multi-channel DDCS fiber, rack backplane bus, isolated DI/DO terminals
• Time Synchronization Accuracy: Multi-channel fiber timing deviation ＜1μs
• Mounting: Standard rack slot embedded installation
• Dimension: 210mm×155mm×32mm
• Net Weight: 1.0kg
• Protection Class: IP20 (indoor cabinet installation)
• Supporting Equipment: AC800PEC controller, IGCT/IGBT power unit, DDCS fiber cable, 24VDC redundant power supply
• Commissioning Tools: ABB Control Builder software, fiber attenuation tester, insulation resistance tester, anti-static wristband

Supporting System

Supporting Hardware

Commissioning Tools

Upper-level System

Typical Application Industries

Product Features

1. High-speed Real-time Closed-loop Regulation: The dual-core architecture ensures the adjustment response time ≤50ms under load disturbance, with high steady-state control accuracy to adapt to frequent load fluctuation working conditions of large rotating machinery.
2. Full-galvanic Isolation Anti-interference Design: Optical fiber completely isolates high-frequency harmonic and ground loop interference in industrial sites to avoid drive signal abnormality and equipment runaway safety accidents.
3. Microsecond-level Hardware Safety Protection: Independent hardware protection logic does not rely on software operation, which can reliably cut off drive output under various fault conditions to protect power semiconductors and the whole power system.
4. Dual-scenario Software Adaptability: The same hardware can be applied to excitation control and medium-voltage frequency conversion drive systems through firmware upgrade, effectively reducing spare part inventory cost.
5. Wide-temperature Industrial Rugged Design: Stable operation within 0℃~+60℃, compliant with IEC EMC standards, 24/7 continuous operation with MTBF ≥190000 hours.
6. Plug-and-play Rack Compatibility: Direct hot-swappable replacement for faulty boards, existing wiring, optical fiber and control programs can be reused to minimize equipment downtime during maintenance.

II. Technical Specifications

2.1 Electrical Parameters

• Model: PDD405A101, Part No.: 3BHE041626R0101
• Operating Power: DC 24V, power consumption ≤10W
• Storage: 16MB Flash memory
• Timing Synchronization Error: ＜1μs
• Regulation Response Time: ≤50ms
• Control Precision: Voltage ±0.25%, Speed ±0.01%FS
• Dielectric Withstand Voltage: 2500VAC/1min between fiber and backplane side
• Protection Functions: DESAT short-circuit, under-voltage, fiber break, over-temperature, bridge arm shoot-through hardware interlock protection
• Supported Algorithms: DTC direct torque control, adaptive PID AVR excitation regulation

2.2 Mechanical Parameters

• Mounting: Standard rack slot snap installation
• Housing: Flame-retardant PCB with metal reinforced panel
• Indicators: Multi-channel LED lights for power, run, communication and fault status
• Terminals: Spring anti-loose isolated terminals for shielded cables
• Dimension: 210×155×32mm
• Net Weight: 1.0kg

2.3 Environmental Specifications

• Operating Temperature: 0℃ ~ +60℃
• Storage Temperature: -25℃ ~ +70℃
• Humidity: 5%~95%RH, non-condensing, no corrosive gas or conductive dust

III. Key Features

1. Core Closed-loop Regulation Calculation: Realizes automatic voltage regulation of generators and high-precision torque control of medium-voltage motors to stabilize system voltage, rotating speed and active/reactive power output.
2. Multi-channel Power Unit Synchronous Drive Scheduling: Ensures synchronous operation of multiple inverter bridge arms, realizes centralized status monitoring and coordinated control of all power modules via bidirectional fiber communication.
3. Fault Latching & Accident Traceability: Automatically records fault time, type and pre-fault operating waveforms to provide accurate data support for equipment accident analysis and protection setting optimization.
4. Field Interlock Signal Acquisition & Safety Logic Output: Realizes local equipment interlock, fault alarm and emergency trip control through isolated digital input and output channels.
5. Offline Parameter Backup & Online Remote Commissioning: Supports multi-group parameter storage, online program download and firmware upgrade to facilitate on-site debugging and equipment performance optimization.
6. Retrofit Spare Part for Legacy Power Control Systems: Compatible with UNITROL6000 and AC800PEC old racks and wiring, widely used in aging control board replacement and industrial automation upgrading projects.

IV. Working Principle

V. Application Scenarios

1. Maintenance and spare part replacement of generator excitation control units in thermal, hydropower and nuclear power plants.
2. Technical renovation and faulty board replacement of main drive control systems in metallurgical hot and cold rolling production lines.
3. Preventive maintenance and hardware upgrading of medium-voltage frequency conversion equipment for mine hoists and long-distance belt conveyors.
4. Drive system overhaul and compatible transformation of oil & gas pipeline and chemical compressor units.
5. Intelligent upgrading of large water supply and sewage treatment pump frequency conversion control systems.