R438 AVR is for LEROY SOMER LSA 42.2, LSA 43.2, LSA 44.2 alternators with AREP excitation.

AVR Characteristics
- Standard power supply: AREP or PMG.
- Rated overload current: 8 A - 10 s
- Electronic protection (overload, short-
circuit on opening of voltage sensing
circuit): excitation overload current for 10
seconds then return to approximately 1A.
The alternator must be stopped (or the
power switched off) in order to reset the
protection.
- Fuse: F1 on X1, X2.8A; slow - 250V
- Voltage sensing: 5 VA isolated via
transformer;
<00A5> 0-110 V terminals = 95 to 140 V,
<00A5> 0-220 V terminals = 170 to 260 V,
<00A5> 0-380 V terminals = 340 to 520 V.
- Voltage regulation ± 1%.
- Normal or rapid response time via ST2 jumper (see below).
- Voltage adjustment via potentiometer P2
other voltages via adapter transformer
- Current sensing (parallel operation): C. T.
2.5 VA cl1, secondary 1 A (optional).
- Quadrature droop adjustment via
potentiometer P1
- Max. excitation current adjustment via
P5.