The ESD5521 Speed Control Unit (Governor) is a precision electronic speed controller designed specifically for engines equipped with Normally Closed (N/C) actuators. It is a specialized variant of the ESD5500 series, engineered to deliver fast and accurate engine speed regulation. This model is highly valued in industrial generator applications for its reliability and its ability to maintain a constant frequency under varying load conditions.
| Feature | Detailed Specification |
| Model Number | ESD5521 |
| 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% (Across Operating Temperature) |
| Input Signal (MPU) | 0.5 – 120 V RMS |