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Leroy Somer R438 Original AVR

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voltage Regulator

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THERMAL DRIFT

340 to 520 V

MAXIMUM PANEL THICKNESS

25*15*10 inc

UNDER FREQUENCY

50/60 Hz

WEIGHT

2.2 Pounds / Oz


The R438 electronic regulator is powered by two auxiliary coils independent of the voltage detection circuit. The first winding provides a voltage proportional to that of the alternator, the second provides a voltage proportional to the stator intensity.

Output

 VA isolated via trans- former • 0-110 V terminals = 95 to 140

Output

 Normal or rapid response time via jumper ST2

Voltage Regulation

  +/-  0.5%


Electronic protection: (in the event of overload, short-circuit, loss of voltage sensing) this acts to restore the value of the excitation current to 1A after 10 s. The alternator must be stopped (or the power switched off) in order to reset the protection.



  • Voltage sensing : 5 VA isolated via trans- former • 0-110 V terminals = 95 to 140 V • 0-220 V terminals = 170 to 260 V • 0-380 V terminals = 340 to 520 V for other voltages, a transformer should be used.
  • Voltage regulation ± 0.5%
  • Normal or rapid response time via jumper ST2 
  • Voltage adjustment via potentiometer P2 or apply a DC voltage of ± 1 V on the terminals of the external potentiometer
  • Current sensing: (parallel operation): input S1, S2 intended for 1 C.T. Š 2.5 VA cl1, secondary 1A (optional)
  • Quadrature droop adjustment via potentio- meter P1



Rated overload current: 10A – 10s