The R438 automatic voltage regulator (AVR) for the Leroy-Somer LSA series of industrial alternators provides excitation current up to 4 A with excellent reliability for AREP & PMG excitation types.
The R438 includes advanced protections such as over-excitation limitation and voltage sensing loss, and also features voltage droop for genset parallel operation. A Load Acceptance Module (LAM) is also included to handle load impact events.
Key Specifications :
|Excitation mode||AREP, PMG|
|Rated excitation current||4 A|
|Regulation accuracy (+/- %)||0.5 %|
|Frequency Range||10 – 100 Hz|
|Voltage setting range (+/- %)||5 %|
|kU/F limitation||K = 1|
|Loss of sensing voltage||✓|
|Short circuit current limitation||-|
|Parallel operation between alternators||✓|
|Load Acceptance Module (LAM)||✓|