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Woodward’s LS-5 Series relays are synchronizer controllers with integrated mains decoupling and protection features. The applications range from independent synch check relay to complex power management with multiple utility feeds, bus tie-breakers and group breakers in combination with Woodward’s easYgen-3400XT/3500XT equipped genset controllers.
Product Type

About 8440-2181

Synchronization and Load Share Control

  • Application Notes
  • Brochure
  • Product Specification
  • Software Manual
  • Technical Manual
  • Software

Wiring efforts are reduced to a minimum, since only one CAN bus connection is required between all LS-5 and easYgen controllers to transmit AC measurement signals, I/O states, flags etc.

The LS-5x2 relays simplify the applications where load bus is served by a mains circuit breaker (MCB) and a generator group breaker (GGB). It senses voltage and current, quantifies the synchronization parameters and transmits the signals via CAN bus to the easYgen-3400XT/3500XT genset controllers. The two breakers control capability along with mains decoupling and protection features make it a perfect choice for transfer switch control under guidance of an external supervisory control. The LS-5x2 is software selectable to be applied as an LS-5x1 thereby facilitating hardware standardization to OEM switchgear builders, generator packagers, and system integrators.

The LS-5x2 Series is available in two different mounting styles. An LS-512 with an aluminum powder coated housing without display is designed to be back panel mounted.


  • Up to 16 LS-5x2 relays can be operated in one network with up to 32 easYgen-3400XT/3500XT
  • Remotely selectable breaker transition modes: Open, Closed (short parallel <100ms), Interchange, Indefinite parallel
  • Software selectable to function as one breaker control
  • Internal power calculation with option to feed active power from external transducer
  • Phase match or slip frequency synchronization with voltage matching
  • Full protection package (including df/dt (ROCOF), phase shift, and mains voltage increasing protection according to new German grid code)
  • Segment control for the load sharing
  • Event Log with up to 300 entries
  • Automatic date and time synchronization between the LS-5 units and the connected easYgen-3400XT/3500XT controls
  • LS-5 “Stand alone” mode without the easYgen-3400XT/3500XT is possible
  • Preconfigured application modes that simplify the configuration process for complex multi-breaker applications
  • AUTOmatic and MANual mode
  • Full remote control via CAN or RS-485 interface
  • Breaker open/close failure detection
  • Mains decoupling “Test” mode
  • Lock keypad feature
  • 4 freely configurable alarms
  • 8 Freely configurable LED`s on the LS-512 back panel mountable device
  • Multilingual capability: English, German, Spanish, French, Italian, Portuguese, Japanese, Chinese, Russian, Turkish, Polish

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