• leroy somer R438
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2 - R438 A.V.R. 
2.1 - 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 ;
• 0-110 V terminals =   95 to 140 V,
• 0-220 V terminals = 170 to 260 V,
• 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
(see below).