Leroy-Somer D350 AVR – digital automatic voltage regulator

The D350 digital automatic voltage regulator (AVR) for industrial alternators provides excitation current up to 5 A with excellent reliability for 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.

Key specifications

Technology
Digital

Excitation mode
SHUNT, AREP, PMG

Rated excitation current
5 A

Regulation accuracy (+/- %)
0.25 %

Frequency range
10 – 100 Hz

Voltage setting range (+/- %)
10 %

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

D350 can be configured using the Leroy-Somer EasyReg Advanced software.

Technical notes

ER09 : D350 contactor setting for three different voltages

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