Leroy-Somer D550 AVR – digital automatic voltage regulator

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

D550 includes advanced protections such as over-excitation limitation and voltage sensing loss, and also features voltage droop for genset parallel operation. The D550 is also equipped with a Load Acceptance Module (LAM) to handle load impact events.

The D550 AVR is also optimized for grid paralleling operation, and complies with the latest grid code regulations, including the latest German grid code regulations VDE 4110 and VDE 4105. In this context, the D550 also includes active & reactive reverse power alarms.

Key specifications

Technology
Digital

Excitation mode
SHUNT, AREP, PMG

Rated excitation current
7 A

Regulation accuracy (+/- %)
0.25 %

Frequency range
10 – 400 Hz

Voltage setting range (+/- %)
30 %

kU/F limitation
0.5 < k< 3

Loss of sensing voltage
✓

Over-excitation limitation
✓

Short circuit current limitation
✓

Voltage droop
✓

Parallel operation between alternators
✓

Load Acceptance Module (LAM)
✓

Compatible products

Configuration & setup

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

Firmware update release notes

D550 Firmware version 1.2.7
D550 Note for Grid Code Application

Downloads