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.
|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||✓|
|Short circuit current limitation||✓|
|Parallel operation between alternators||✓|
|Load Acceptance Module (LAM)||✓|
D550 can be configured using the Leroy-Somer EasyReg Advanced software.
D550 Firmware version 1.2.7
D550 Note for Grid Code Application
This module provides a 24VDC voltage, generated using the power supply (AREP, PMG) for digital AVRs of the D510C or D550 type.
Black start can also accept an external voltage 8-35VDC coming from a customer power supply.