The R438 automatic voltage regulator (AVR) for the LSA series of industrial alternators provides excitation current up to 5 A with excellent reliability for permanent magnet (PMG) or AREP excitation types.
| Technology | Analog |
| Excitation mode | AREP, PMG |
| Rated excitation current | 4 A for 15 s |
| Regulation accuracy (+/- %) | 0.50% |
| Frequency range | 20 – 100 Hz |
| Voltage setting range (+/- %) | 5% |
| kU/F limitation | K = 1.2 |
| Loss of sensing voltage | ✓ |
| Over-excitation limitation | ✓ |
| Short circuit current limitation | – |
| Voltage droop | ✓ |
| Parallel operation between alternators | ✓ |
| Load Acceptance Module (LAM) | – |
