R438
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
| Technology |
Analog |
| 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 |
✓ |
| Over-excitation limitation |
✓ |
| Short circuit current limitation |
- |
| Voltage droop |
✓ |
| Parallel operation between alternators |
✓ |
| Load Acceptance Module (LAM) |
✓ |
Compatible products
Options
- R726 module for Cos Phi regulation
- R729 for Cos Phi + kVAr regulation & 4-20 mA signal treatment
- External potentiometer
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