R438 AVR For Leroy Somer Alternators Product Description 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.