Description
- Model: UAD149A0011 (Part No: 3BHE014135R0011)
- Brand: ABB (Switzerland)
- Series: UNITROL 1000 Series (specifically UNITROL 1020)
- Core Function: Automatic Voltage Regulator (AVR) and Excitation Control for synchronous generators; New Surplus
- Product Type: Excitation Control Module / AVR
- Key Specs: 20 A continuous output, Microprocessor-based, Integrated PID control
- Nominal Output Current: 20 A DC
- Peak Output Current: 40 A DC (for 10 seconds)
- Excitation Voltage Range: Up to 250 V AC input
- Control Modes: Automatic Voltage Regulation (AVR), Field Current Regulation (FCR), Power Factor (PF), and Reactive Power (VAR)
- Digital Inputs: 6 Configurable inputs
- Digital Outputs: 4 Configurable outputs (Relay/Transistor)
- Analog Inputs: 2 High-precision inputs (-10 to +10 V or 0/4 to 20 mA)
- Communication Port: RS-485 (Modbus RTU), USB for commissioning via CMT1000 software
- Protection Functions: Over-excitation Limiter (OEL), Under-excitation Limiter (UEL), Loss of excitation, and Generator over-voltage
ABB UAD149A0011 3BHE014135R0011
Installation & Configuration Guide
Phase 1: Pre-Installation (Est. 15 mins)
⚠️ Safety Warning:
- Ensure the generator is at a complete standstill and the prime mover is locked out.
- High residual magnetism or stored charge in the field windings can be dangerous; verify zero voltage on excitation lines.
- Confirm the current transformer (CT) secondary circuits are shorted before disconnecting to prevent high-voltage spikes.
Phase 2: Mounting & Wiring (Est. 25 mins)
- Placement: Mount the UAD149A0011 in a clean, vibration-free area of the control cabinet. Use the integrated cooling fins; do not block airflow.
- Power Connections: Connect the PMG (Permanent Magnet Generator) or Auxiliary Winding to the AC input terminals. Ensure tight connections to handle the 20 A continuous load.
- Field Output: Connect F+ and F- to the generator field. Pro Tip: In my experience, double-checking the polarity here is the difference between a successful start and a costly demagnetization event.
Phase 3: Commissioning & Software (Est. 40 mins)
- Software Tool: Connect your laptop to the front USB port using the ABB CMT1000 tool.
- Configuration: Upload the existing parameter set (if available) or input the generator nameplate data (Voltage, Frequency, Excitation Current at No-Load/Full-Load).
- Self-Test: Use the CMT1000 software to perform a static “Step Response” test before rotating the machine to verify the regulator is responding to setpoint changes.
Customer Cases & Industry Applications
Case 1: Emergency AVR Replacement for a Data Center Genset A Tier-3 data center in Shanghai had an excitation failure on their 2MVA backup generator. The original 3BHE014135R0011 had suffered a component failure due to high ambient heat. Because the data center requires 100% N+1 redundancy, they couldn’t afford a week of downtime. We supplied a New Surplus unit and delivered it via same-day courier. The site engineer replaced the unit and restored the AVR functionality by midnight.
Case 2: Retrofitting an Aging Hydroelectric Plant A small-scale hydro plant was using an old analog voltage regulator that was drifting significantly. They decided to upgrade to the digital UAD149A0011 to utilize its Power Factor control mode and Modbus communication. To be honest, the digital upgrade didn’t just stabilize the voltage; it allowed them to monitor excitation health remotely for the first time, saving them multiple trips to the remote site.
ABB UAD149A0011 3BHE014135R0011
Frequently Asked Questions (FAQ)
Q: Is the UAD149A0011 compatible with the older UNITROL 1000-7 units? A: The UAD149A0011 is part of the UNITROL 1020 family, which is the successor to the 1000-7. While the core functions are the same, the wiring terminals and software (CMT1000) are different. You can replace an old unit, but you will need to refer to the migration guide for terminal re-mapping.
Q: Does this module require an external power supply? A: It can be powered directly from the generator’s internal windings or a PMG. However, for initial programming and commissioning without the generator running, you can power the control electronics via the USB port or a separate 24 V DC input.
Q: Can I use this for a brushless excitation system? A: Yes, the UNITROL 1020 series is specifically designed for brushless synchronous machines where the AVR controls the exciter stator field.
ABB UAD149A0011 3BHE014135R0011
Current Inventory Highlights
Beside the UAD149A0011, we have these high-performance control parts ready for dispatch:
- ABB www.newplcdcs.com PM866K01 (Controller Kit)
- ABB CI854A (Profibus Communication)
- ABB PP885 (Panel 800 HMI)
- General Electric www.newplcdcs.com IS200STAIH1A (Terminal Board)
- Honeywell TC-FXX132 (Fiber Optic Cable)
- Bently Nevada 3500/22M (Transient Data Interface)
- Siemens 6DD1600-0BA2 (Control Module)
- Triconex 3008 (Main Processor)
