Overview
The S6700H is the enhanced variant of the GAC S6700E speed governor, adding advanced self-diagnostics and system fault input protection. It is a 24V DC closed-loop governor with built-in overspeed protection (1500Hz–7.5kHz, 1.5Sec delay), loss-of-signal protection, paralleling control, and external high-level fault input for critical power applications.
Key Features
- 10A Continuous Output — High-current actuator drive for GAC ADC, Barber-Colman, and Woodward proportional actuators up to 10 lb-ft torque
- Overspeed Protection — Adjustable 1500Hz–7.5kHz threshold with 1.5-second delay and automatic fuel cutoff relay output
- Isochronous Speed Control — ±0.25% steady-state stability maintains constant engine RPM from no-load to full-load for precise generator frequency
- Magnetic Pickup Input — 600–9500Hz differential MPU sensing with noise rejection for reliable tachometer signal in electrically noisy generator enclosures
- Soft-Start Ramp — Programmable speed ramp eliminates startup smoke, reduces actuator current surge, and provides smooth engine acceleration
- 12/24V Dual Voltage — Auto-sensing 8–32V DC supply with reverse polarity protection for universal generator application
Technical Specifications
| Parameter | Value |
|---|---|
| ———– | ——- |
| Model | S6700H |
| Brand | GAC |
| Type | Electronic Speed Governor (Enhanced, Overspeed & Paralleling, 24V) |
| Control Mode | Isochronous / Droop adjustable (0–3%) |
| Speed Stability | <±0.25% (steady-state frequency band) |
| Speed Range | 1K–5K Hz (or 1K–6.5K Hz) |
| Speed Sensor Input | 1–20 V (MPU signal) |
| Actuator Output | 2.5–10 A continuous |
| Power Consumption | 50 mA + actuator current |
| Supply Voltage | 24 V DC (reverse-polarity protected) |
| Temperature Drift | ±1% maximum |
| Frequency Trim | ±200 Hz (external 1KΩ pot) |
| Overspeed Range | 1500Hz–7.5kHz |
| Overspeed Delay | 1.5 Sec |
| Application | Diesel / Gas Critical Power Speed Control |
Compatibility
Compatible with diesel and gas generator engines using proportional actuators. Supports paralleling operation with load sharing. Works with Cummins 4BT, 6BT, 6CT, NTA855, KTA19 engines.
Why Choose ZenixPower
- Overspeed Protection — 1500Hz–7.5kHz, 1.5Sec delay
- Loss-of-Signal Safe Shutdown — MPU failure = safe stop
- Paralleling Ready — Multi-genset load sharing built in
- System Fault Input — External alarm → auto shutdown
- Enhanced Diagnostics — Advanced self-test and fault reporting
- Reverse Polarity Protected — Survives accidental battery reversal
Competitors GAC ESD5500E — world’s most popular universal governor | KUTAI EG3000 — value alternative | Fortrust C2002 — budget-friendly
Specification Comparison
| Parameter | S6700H | GAC ESD5500E | KUTAI EG3000 | Fortrust C2002 |
|---|---|---|---|---|
| Brand | GAC (USA) | GAC (USA) | KUTAI (Taiwan) | Fortrust (China) |
| Function | Electronic Speed Governor (Enhanced, Overspeed & Paralleling, 24V) | Electronic + Overspeed | Closed-loop Electronic | Electronic + Soft-Start |
| DC Supply | — | 12/24V DC | 12/24V DC | 12/24V DC |
| Actuator Output | 2.5–10 A continuous | 10A continuous | 0.5–15A | 10A max |
| Speed Stability | ±<0.25 (steady-state frequency band)% | ±0.25% | ±0.5% | ±0.25% |
| Speed Range | 1K–5K Hz (or 1K–6.5K Hz) | 600–9500 Hz | 600–9500 Hz | 500–9000 Hz |
| Overspeed Protection | Built-in | Built-in | Optional | Built-in |
| Paralleling | No | Optional | No | No |
| Price | Contact Us | $280–450 | $180–300 | $120–220 |
