Leroy-Somer digital voltage regulators are designed to integrate easily in complex systems, providing regulation and security features to ensure optimal performance of the installation.

Excitation types including power factor (PF) regulation, kVAr regulation, manual mode and mains PF regulations are available, as well as advanced regulation functions such as Load Acceptance Module (LAM) or voltage droop to optimize load management and paralleling between gensets.

Digital voltage regulators Series

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The D550 digital automatic voltage regulator (AVR) for industrial alternators provides excitation current up to 7 A with excellent reliability for SHUNT, permanent magnet (PMG) or AREP (auxiliary winding) excitation types.

D350 includes advanced protections such as over-excitation limitation and voltage sensing loss. It also includes speed detection capabilities, with over- and under-speed alarms. D350 also features voltage droop for genset parallel operation, and it is equipped with a Load Acceptance Module (LAM) to handle load impact events.

Configuration & setup

D550 can be configured using the Leroy-Somer EasyReg Advanced software.

Technical notes

ER09 : D550 contactor setting for three different voltages

echnologyDigitalExcitation modeSHUNT, AREP, PMGRated excitation current8 A at 55°C / 7 A at 70°C
Regulation accuracy (+/- %)0.25 %Frequency range10 – 400 HzVoltage setting range (+/- %)30 %kU/F limitation0.5 < k< 5Loss of sensing voltage✓Over-excitation limitation✓Short circuit current limitation✓Voltage droop✓Parallel operation between alternators✓Load Acceptance Module (LAM)✓