The ESD5520 Speed Control Unit (Governor) is a high-performance, all-electronic governor designed for precise engine speed regulation. While it shares many core features with the ESD5500E, the ESD5520 is specifically optimized for Normally Closed (N/C) actuators. It is frequently used in high-end generator sets to ensure rapid response to load changes and to maintain a constant engine frequency (50/60Hz).
| Feature | Detailed Specification |
| Model Number | ESD5520 |
| Series | ESD5500 High-Performance Series |
| Operating Voltage | 12V or 24V DC (Dual Voltage Support) |
| Steady State Stability | ±0.25% |
| Speed Range | 1KHz – 7.5KHz Continuous |
| Max Output Current | 10A (Peak) |
| Starting Fuel Control | 0 – 100% (Adjustable) |
| Speed Ramp Time | 1 – 20 Seconds (Adjustable) |
| Speed Drift | < ±1% (Thermal Stability) |
| Input Signal (MPU) | 0.5 – 120 V RMS |