HT INDUSTRIAL AUTOMATION LIMITED

Leroy Somer Voltage Regulator D550 AVR

Leroy Somer D550 Installation and maintenance Manual.pdf

LEROY SOMER D550 AVR DATA SHEET.pdf

Origin: France

Brand: Leroy Somer

Model: D550, Genuine Leroy Somer R449 AVR had been discontinued and replaced by D550 AVR now.

The D550 Leroy Somer 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.

Leroy Somer D550 Voltage Regulator includes advanced protections such as over-excitation limitation and voltage sensing loss, and also features voltage droop for genset parallel operation. The Leroy Somer D550 AVR 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.

Specifications for LEROY SOMER D550 AVR:

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 Leroy Somer Alternators:

LSA 40

LSA 42.3

LSA 44.3

LSA 46.3

LSA 47.2

LSA 49.3

LSA 50.2

LSA 180-225 (400Hz)

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