ABB UNITROL 1010 (3BHE035301R1002 / UNS0121A‑Z V1) Full Model Name: UNITROL 1010 3BHE035301R1002 UNS0121A‑Z V1 Brand / Origin: ABB / Sweden (Developed in Switzerland) Type: Compact Digital Excitation Controller (AVR), suitable for synchronous generators/motors ≤10MVA. ## 1. Model Correspondence 3BHE035301R1002: Complete Order Number / Material Number UNS0121A‑Z V1: Circuit Board Part Number (for maintenance and replacement) UNITROL 1010: Product Series Name (UNITROL 1000 Series) ## 2. Core Electrical Parameters Main Power Supply: 63～250V AC, 50/60Hz ±5% Excitation Output: Max 10A DC (Continuous), IGBT Power Stage Control Accuracy: Steady-state voltage accuracy ±0.2%, dynamic response ≤10ms Control Cycle: 1ms (32-bit RISC Processor) Power Consumption: ≤50W Excitation Mode: Compatible with Brushless / Static Excitation ## 3. I/O Interfaces Analog Input: 3 channels (generator voltage, current, excitation current) Analog Output: 2 channels (excitation current, generator voltage) Digital Input: 8 programmable channels (24V DC) Digital Output: 8 programmable channels (Relay, 250V AC/5A) Communication Interfaces: Ethernet, RS‑485, USB; supports Modbus TCP/RTU, Profibus‑DP, IEC 61850 ## 4. Environmental & Mechanical Specifications Operating Temperature: ‑40℃ ～ +70℃ (Industrial Wide Temperature Range) Storage Temperature: ‑50℃ ～ +85℃ Humidity: 5%～95% RH (Non-condensing) Dimensions: 302 × 170 × 85 mm Weight: Approximately 2.8 kg Ingress Protection: IP20 Certifications: CE, UL, DNV (Marine Classification Society), SIL 2 ## 5. Key Functions Control Modes: AVR (Automatic Voltage Regulation), Manual (Excitation Current), Var (Constant Reactive Power), PF (Constant Power Factor), Open Loop. Protection Functions: Overexcitation / Underexcitation Limitation, V/Hz Limitation, Short Circuit Forced Excitation, Rotating Diode Monitoring, Over-temperature Protection. System Features: 1+1 Hot Standby Redundancy (Switching ＜5ms), Automatic Synchronization, Reactive Power Load Sharing, Compatible with Grid-tied / Island Operation. ## 6. Typical Applications Small and medium-sized thermal power / hydropower / diesel generators (≤10MVA) Industrial drive motors, combined heat and power generation, energy storage power stations Marine vessels, offshore platforms, data center standby power supplies