Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 3BHE032025R0101 |
| Functional Model | PCD235A101 |
| Manufacturer | ABB |
| Product Type | Exciter Control Module / AVR Master Controller |
| Series | UNITROL 6000 / AC 800PEC |
| Power Supply | Dual redundant 24 V DC (20-28 V), hot-swappable |
| Analog Inputs | 3 × ±10 V or ±20 mA, 16-bit Σ-Δ ADC |
| Analog Outputs | 3 × ±10 V, 12-bit resolution |
| Digital Inputs | 12 × 24 V / 48 V dry contact |
| Relay Outputs | 16 × Form C, 250 V AC / 5 A |
| Temperature Inputs | 3 × PT100 / PTC |
| Control Accuracy | ±0.5% (voltage regulation, full scale) |
| Response Speed | <20 ms |
| Communication Interfaces | RS422 (CEX2-BUS), RS232/RS485, optional Modbus TCP |
| Operating Temperature | -25°C to +70°C |
| Protection Rating | IP20 (cabinet-mounted) |
| Dimensions (H×W×D) | 373 mm × 73.5 mm × 142 mm |
| Weight | Approx. 1.53 kg |
Main Features and Advantages
Dual-mode operational capability: The ABB 3BHE032025R0101 excels in two distinct application domains. In excitation control mode, the PCD235A101 supports four AVR closed-loop regulation modes—constant terminal voltage, constant reactive power, constant power factor, and constant field current—with seamless transition between modes and voltage regulation accuracy of ±0.5% of rated value . In drive control mode, the 3BHE032025R0101 enables multi-motor synchronization, load sharing, and zero-speed full-torque vector control with synchronization jitter below 2 ms .
Comprehensive protection and stability functions: The ABB 3BHE032025R0101 integrates a full suite of generator protection features including over-excitation/under-excitation, rotor overcurrent, loss-of-field protection, inverter de-excitation, erroneous forced excitation blocking, and load rejection impact suppression . The built-in power system stabilizer (PSS) function actively dampens low-frequency grid oscillations, ensuring compliance with grid interconnection technical standards worldwide . The module also supports fault waveform recording, capturing voltage, current, and firing pulse waveforms with millisecond timestamp logging for diagnostic purposes .
Hot-swap capability and high availability: The 3BHE032025R0101 features dual redundant 24V DC power inputs with hot-swap support, allowing module replacement without generator de-excitation or unit shutdown . This capability is critical for continuous production facilities where unplanned downtime can result in significant production losses. The hardware supports 1:1 primary-standby and TMR triple redundant SIL2 safety architectures, ensuring maximum system integrity .
Advanced communication and diagnostics: The ABB PCD235A101 provides versatile connectivity options including RS422 for CEX2-BUS backplane communication, RS232/485 for serial integration, and optional Modbus TCP for direct connection to plant-wide DCS or SCADA systems . Configuration is performed using ABB’s PCM600 engineering tool and CMT (Control Module Tool), offering intuitive parameterization and real-time monitoring capabilities .
Application Field
The ABB 3BHE032025R0101 is deployed across a wide spectrum of power generation and heavy industrial applications. In the power generation sector, the PCD235A101 serves as the core controller for excitation systems in thermal power plants (steam and gas turbines), hydroelectric stations (large and medium-sized turbine-generator units), and combined-cycle power facilities . The module controls synchronous generator excitation to maintain stable terminal voltage, manage reactive power distribution, and ensure grid stability under varying load conditions .
In the oil and gas industry, the ABB 3BHE032025R0101 is employed in offshore FPSO vessels and marine power systems for shipboard synchronous generator excitation and main propulsion drive control . The module’s robust design and wide operating temperature range make it suitable for the harsh environmental conditions typical of offshore installations . In metals and mining, the 3BHE032025R0101 functions as the AC800PEC main control unit for multi-motor synchronized drives in rolling mills, coiling machines, large centrifugal compressors, and material handling systems .
Additional applications include water and wastewater treatment facilities utilizing variable-speed drives for large pumping systems, cement production for kiln and mill drives, and pulp and paper facilities requiring precise speed and tension control . For facilities operating legacy UNITROL 5000 or earlier systems, the ABB PCD235A101 represents a critical spare part for maintaining operational continuity and avoiding costly system upgrades .
