Description
Core Product Summary (Brand / Model / Key Attributes)
The Woodward EGCP-2 8406-121 is a microprocessor-based Engine Generator Control Package designed for complete automation and protection of diesel or gas engine-driven generator sets. It integrates engine management, generator synchronization, real-power (kW) and reactive-power (kVAR) load control, and protective functions in a single unit.
The 8406-121 variant accepts 50–150 Vac PT sensing. It operates from a 9–32 Vdc supply (12 or 24 Vdc nominal), supports generator sets up to 30 000 kW, and can network up to eight units via RS-485 for automatic sequencing, base-load, peak-shaving or standby applications. The front panel provides two backlit LCD displays and a membrane keypad. Operating temperature range is –20 to +70 °C. The control is intended for use with an external automatic voltage regulator and speed control.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product type | Engine Generator Control Package (EGCP-2) |
| Part number | 8406-121 |
| PT sensing range | 50–150 Vac rms |
| Power supply | 9–32 Vdc (12/24 Vdc nominal) |
| Max. power consumption | 20 W |
| CT input | 0–5 A rms |
| Generator frequency range | 40–70 Hz |
| Network capacity | Up to 8 units (RS-485 load-sharing) |
| Display | Two backlit LCDs + membrane keypad |
| Dimensions (H × W × D) | 282 × 358 × 69 mm |
| Operating temperature | –20 to +70 °C |
| Storage temperature | –40 to +105 °C |
| Humidity | 95 % non-condensing |
| Communications | RS-422 (Modbus / Servlink), RS-485 |
Detailed Product Overview
The Woodward EGCP-2 8406-121 provides integrated control of engine starting, speed, generator voltage, real and reactive power, and protective shutdowns for diesel or gas gensets. It works with an external speed governor and automatic voltage regulator to deliver automatic start/stop sequencing, synchronization to a utility or other generators, isochronous or droop load sharing, base-load control, import/export control, and soft transfer functions.
Engine-side functions include pre-glow control, fuel solenoid actuation, starter control, kVA-controlled cool-down, and continuous monitoring of oil pressure, coolant temperature, battery voltage and engine speed (with overspeed protection). Generator-side protection covers over/under voltage, over/under frequency, reverse power, reverse VARs, overcurrent, and loss-of-utility detection.
A network of up to eight EGCP-2 units communicates over an RS-485 bus for automatic generator sequencing and percentage-based load sharing. Configuration and monitoring are performed from the local dual-LCD operator panel or via the RS-422 serial port using Woodward PC tools or Modbus. The control is suitable for stand-alone, utility-paralleled, or multi-unit isolated applications up to 30 000 kW.
Engineering Selection Highlights
- Select the 8406-121 when PT secondary voltage is in the 50–150 Vac range; the companion 8406-120 covers 150–300 Vac.
- Requires an external speed control and automatic voltage regulator; the EGCP-2 supplies the appropriate bias signals.
- Supports networking of up to eight units via RS-485 for automatic sequencing and isochronous load sharing.
- Provides comprehensive engine and generator protective functions with configurable alarm and shutdown set-points.
- Dual LCD operator interface allows local configuration, status monitoring and setpoint adjustment without additional software.
- Designed for continuous operation in ambient temperatures from –20 to +70 °C.
- CageClamp-style terminal blocks simplify field wiring.
EGCP-2 8406-121
EGCP-2 8406-121
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
|---|---|---|
| Speed control | External Woodward or compatible speed governor | Bias outputs: ±3 Vdc, 0.5–4.5 Vdc or 500 Hz PWM |
| Voltage regulator | External automatic voltage regulator | Bias outputs: ±1 Vdc, ±3 Vdc or ±9 Vdc |
| PT sensing | 50–150 Vac rms (8406-121) | Four PT inputs (generator + utility/bus) |
| CT sensing | 0–5 A rms | Generator current measurement |
| Power supply | 9–32 Vdc (SELV) | Max. 20 W consumption |
| Multi-unit network | Up to 8 EGCP-2 units via RS-485 | Percentage-based isochronous load sharing |
| Serial communications | RS-422 (Modbus RTU or Servlink) | PC configuration and HMI interface |
| Application modes | Stand-alone, utility parallel, multi-unit isolated or paralleled | Configurable for base-load, peak-shave or standby |
Dimensions, Mounting & Connection Notes
Enclosure dimensions are 282 mm high × 358 mm wide × 69 mm deep. The unit is panel-mounted and features a front operator interface with two backlit LCD displays and membrane keypad. Terminal blocks are screwless CageClamp style. Operating temperature around the chassis is –20 to +70 °C; storage temperature is –40 to +105 °C. Relative humidity rating is 95 % non-condensing.
FAQ
What is the Woodward EGCP-2 8406-121?
It is a microprocessor-based Engine Generator Control Package that provides complete engine and generator control, synchronization, load sharing and protection for diesel or gas gensets.
What is the PT sensing range of the 8406-121?
The 8406-121 accepts 50–150 Vac rms PT inputs. The companion part 8406-120 covers 150–300 Vac.
How many generator sets can be networked?
Up to eight EGCP-2 units can be connected via RS-485 for automatic sequencing and load sharing.
What power supply does the EGCP-2 8406-121 require?
9–32 Vdc (12 or 24 Vdc nominal), with a maximum consumption of 20 W.
Does the unit include a speed governor and voltage regulator?
No. It is designed to work with an external speed control and automatic voltage regulator, supplying the necessary bias signals.
What protective functions are included?
Engine protection (oil pressure, coolant temperature, battery voltage, overspeed, start failure) and generator protection (over/under voltage and frequency, reverse power, reverse VARs, overcurrent, loss of utility).
What operator interface is provided?
Two backlit LCD displays and a membrane keypad for local monitoring, status display and setpoint configuration.
What communication ports are available?
RS-422 for Modbus or Servlink PC interface and RS-485 for multi-unit load-sharing network.
Verification & Troubleshooting Notes
- Confirm PT secondary voltage is within the 50–150 Vac range specified for the 8406-121.
- Verify that the external speed control and voltage regulator accept the configured bias signal type and range.
- Check power-supply voltage remains within 9–32 Vdc under all operating conditions, including cranking.
- Ensure RS-485 network wiring and addressing are correct when multiple units are used for load sharing.
- Use the dual LCD operator panel or Woodward PC tools to review alarm and event history for diagnostic information.
- Confirm CT polarity and ratio match the programmed values to obtain accurate power and current metering.
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