Woodward LS-5 8440-2150 Synchronizer and Circuit Breaker Controller
The Woodward LS-5 (8440-2150, LS-521 V2) is a compact, microprocessor-based synchronizer and circuit breaker controller with integrated mains decoupling and protection functionsWoodward. Designed for complex power management systems, it synchronizes generators with the grid or other gensets, controls bus tie breakers, and ensures safe load sharing and fault decoupling. The LS-521 (8440-2150) features a graphic LCD display and plastic housing for cabinet front-door mounting.
Primary Applications
- Generator-to-grid synchronization and mains decoupling (ANSI 25/81/59/27 protection)
- Multi-bus / multi-generator power management with bus tie breakers
- Load sharing, import/export control, and parallel operation of gensets (paired with Woodward easYgen-3400XT/3500XT controllers via CAN bus)
- Standalone sync-check relay for simple breaker interlocking
- Marine, industrial plant, utility, and critical infrastructure power systems
Technical Specifications
| Specification | Details |
|---|---|
| Model | LS-521 V2 (8440-2150) |
| Power Supply | 12/24 Vdc (8–40 Vdc wide range) |
| Voltage Measurement | 100–690 Vac (1.25× Vrated linear range) |
| Frequency | 50/60 Hz (45–65 Hz operating) |
| Synchronization | Phase match / slip frequency; voltage matching |
| Discrete Inputs | 8 isolated, configurable |
| Relay Outputs | 6 configurable (NO/NC, 5 A @ 250 Vac) |
| Analog I/O | 4–20 mA / 0–5 Vdc (configurable) |
| Communication | CAN bus, RS-485 (Modbus RTU) |
| Display | 4-line graphic LCD, backlit |
| Mounting | Front-panel (cabinet door) |
| Protection | df/dt (ROCOF), over/under V/Hz, asymmetry, reverse power |
Recommended LS-5 Series Products
- LS-511 V2 (8440-2140) – DIN-rail mount, aluminum housing, no display; for back-panel installation.
- LS-512 V2 (8440-2160) – Dual-breaker control, expandable to 32 bus segments.
- LS-521 Marine (8440-2155) – Marine-certified (DNV/ABS), enhanced vibration protection.
- LS-522 V2 (8440-2170) – Front-door mount, dual-breaker, advanced load-sharing algorithms.
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