2. General Description

• Type: easYgen‑123 Automatic Synchronizer & Load Sharing Controller

• Application: 3‑phase generators (diesel/gas/steam turbine), grid paralleling / islanded operation

• Control Functions: Auto‑sync, freq/phase/voltage match, kW/kVAR load sharing, speed/frequency control, generator protection, GCB/MCB control

• Serial Ports: RS‑232 + RS‑422 (isolated, for programming/monitoring)

• Analog I/O: 4–20 mA / 1–5 Vdc configurable

• Discrete I/O: 24 Vdc digital inputs, relay outputs

• Mounting: Panel‑mount (front LCD/keypad) or DIN rail

• Enclosure: Industrial metal, Class 1 Div 2 rated (hazardous areas)

3. Key Features

• easYgen‑123 Genset Controller – All‑in‑one sync, load share, and genset control

• Full Auto‑Synchronization – Matches frequency, phase, voltage for seamless paralleling

• Precision Load Sharing – Balances kW/kVAR across multiple gensets

• Dual Serial Communication – RS‑232 (local) + RS‑422 (remote) for 505/505E/MicroNet

• Flexible Analog & Digital I/O – 4–20 mA / 1–5 Vdc, 24 Vdc discrete, relay outputs

• Island / Grid Modes – Selectable standalone or utility‑parallel operation

• Integrated Protection – Over/undervoltage, over/underfrequency, overload, reverse power

• Industrial Grade – −40 °C to +85 °C, shock/vibration resistant

• CE/UL/RoHS – Global compliance

4. Technical Specifications

• Part Number: 5421-123

• Manufacturer: Woodward (USA)

• Product Type: Automatic Synchronizer & Load Sharing Controller

• Model: easYgen‑123

• Power Supply: 24 Vdc ±10%, 35 W max

• Processor: 32‑bit microcontroller

• Sync Accuracy: ±0.01 Hz (freq), ±1° (phase), ±0.5% (voltage)

• Communication: RS‑232 (DB9), RS‑422 (terminal block)

• Analog Inputs: 2 × 4–20 mA / 1–5 Vdc (configurable)

• Analog Outputs: 2 × 4–20 mA

• Digital Inputs: 8 × 24 Vdc level

• Relay Outputs: 6 × relay contact (GCB/MCB, alarms)

• Control Output: PWM speed trimming (for governors)

• Operating Temperature: −40 °C to +85 °C

• Dimensions: 160 × 120 × 50 mm (W×H×D)

• Weight: Approx. 1.3 kg (2.9 lbs)

• Compatibility: 505/505E/505XT governors, MicroNet systems, 5417‑series cables

5. Applications

• Generator Paralleling – Diesel/gas/steam turbine gensets (grid or island)

• Multi‑Unit Load Sharing – Equal kW/kVAR distribution between parallel gensets

• Genset Control & Protection – Start/stop, speed control, voltage regulation, fault protection

• Industrial Power – Power plants, oil/gas, cogeneration, remote sites

• Hazardous Areas – Class 1 Div 2 (offshore platforms, refineries)

6. Ordering Information

• Part Number: 5421-123

• Description: Woodward 5421-123 easYgen‑123 Automatic Synchronizer & Load Sharing Controller, 24 Vdc, RS‑232/RS‑422, for 3‑Phase Generator Grid Paralleling & Islanded Operation