The ABB DEGO-II (specifically the QHFD122 variant) is a high-precision electronic speed governor designed for the precise control of diesel and gas engines. Primarily utilized in marine propulsion and power generation, this digital governor ensures optimal engine performance by regulating fuel injection based on load demands and maintaining stable rotational speeds.
Technical Functionality
The DEGO-II system processes speed signals from magnetic pickups and compares them against a setpoint to command an electronic actuator. It features advanced PID control algorithms that can be tuned for various engine characteristics, providing rapid response to load changes while preventing overspeed conditions or mechanical stress.
Key Specifications
| Parameter | Specification |
| Model | DEGO-II |
| Ordering Code | QHFD122 |
| Application | Engine Speed Control (Marine/Power) |
| Input Signal | Magnetic Pickup (Pulse) / 4-20mA |
| Output Type | PWM / Analog for Actuator Control |
| Control Logic | Microprocessor-based Digital PID |
Operational Precautions
- Magnetic Pickup Gap: Ensure the speed sensor is mounted with the correct clearance from the flywheel teeth; a gap that is too wide will cause signal loss and engine shutdown.
- Actuator Calibration: The mechanical linkage between the actuator and the fuel rack must be free of play (backlash) to prevent “hunting” or unstable engine speeds.
- Shielding: Use twisted-pair shielded cables for all speed sensing and analog signal lines to prevent electromagnetic interference from high-power engine room equipment.
Common Questions Q&A
Q: Can the QHFD122 be used for multi-engine load sharing? A: Yes, the DEGO-II system supports droop or isochronous load sharing modes when integrated with external power management systems (PMS).
Q: What happens if the speed signal is lost? A: The unit is equipped with a fail-safe “Loss of Speed” detection feature that immediately moves the fuel rack to the stop position to prevent engine damage.
Recommended Similar Models
- DEGO-III: The next-generation digital governor with enhanced connectivity.
- QHFD112: A standard variant of the DEGO-II series for simpler engine setups.
- ASAC 70: A specialized electronic actuator often used in conjunction with ABB governors.
- DEGO-IV: A modular governor system designed for modern common-rail engines.
- DAPC: A related digital automated power controller for comprehensive plant management.
For technical documentation and stock status of the ABB DEGO-II QHFD122, please consult our marine and power automation inventory.
E-mail:dcsplcsales@gmail.com
Wechat:+86 13365909307
Phone:+86 13365909307