R438

Automatic Voltage Regulator

• R438 AVRs
  – Storage : -55°C ; +85°C
  – Operation : -40°C ; +70°C
  – 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 ± 0.5%.
  – 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.
  

   

• All manufacturer names and numbers are used for reference purpose only and do not imply that any part is the product of these manufacturer.