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Generator AVR R438 Brushless Leroy Somer Alternator Automatic Voltage Regulator

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Shenzhen Graigar Technology Co., Ltd

Generator AVR R438 Brushless Leroy Somer Alternator Automatic Voltage Regulator

Country/Region china
City & Province shenzhen guangdong
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Product Details

Generator AVR R438 Brushless Leroy Somer Alternator Automatic Voltage Regulator 



R438 Characteristics: 
Voltage regulation: +/-0.5% at steady state and constant speed
Phase to phase voltage sensing
Controls by transistor means the regulation quality is independant of load applied
Integrated "LAM" system to cope with increased loads applied to the engine
Suitable for high levels of viration and harsh environments
The R438 is compatible with other modules giving additional functions
Standard power supply: AREP or PMG
Rated overload current: 8A-10s
Electronic protection(overload,shortcircuit on opening of voltage sensing circuitexcitation overload current for 10 seconds then return to approximately 1A).
Fuse: F1 on X1,X2.8A;slow-250V
Voltage sensing: 5VA isolated via transformer
0-110V terminals=90-140V
0-220V terminals=170-260V
0-380V terminals=340-520V
Voltage regulation +/-1%
Normal or rapid response time via ST2 jumper
Voltage adjustment via potertiometer P2
Current sensing(parallel operation): C.T. 2.5VA cl1,sencondary 1A(optional)
Quadrature drop adjustment via potertiometer P1
Max,excitation current adjustment via P5
Applications to Alternators: LSA 42.2,43.2,44.2
Compatible with the AREP or PMG exitation system

  • Voltage Regulation < ±1%
  • Soft Start Voltage Ramping
  • Sensing Voltage Loss Protection
  • 120 or 240 VAC Sensing, Jumper Selectable
  • Under Frequency Roll Off Protection

Leroy Somer R448 AVR for Generator
AVR FOR GENERATOR R448 is for Leroy Somer 50-300KW Brushless Generator .
R448 Permanent Magnet Generator or A.R.E.P or Auxiliary Winding type generator voltage regulator is a compatible replacement for Leroy Somer R448, R449, R438, and AEM110RE016 and also Olympian FG Wilson 922 124.

  • Voltage Regulation < ±0.5%
  • Load Acceptance Module (LAM)
  • 50/60 Hz Selectable
  • Under Frequency & Exc. Max Protection
  • Single Phase Or Three Phase Voltage Sensing Optional
  • Soft Start Voltage Ramping
  • Normal Rapid Response Time (Option)

Technical Specification

Sensing InputTerminal 0-110V = 95~140V
Terminal 0-220V = 170~260V
Terminal 0-380V = 340~520V
Frequency 50/60 Hz selectable
Power InputVoltage 40~150 VAC 3 phase
Output CurrentMax. 10A
Current DroopMax. 4% @ P.F.=0.8
Voltage Regulation< ±0.5% (with 4% engine governing)
Voltage Build-upResidual volts at AVR terminal > 5 VAC
Voltage OutputMax. 160 VDC @ 120 VAC
External Voltage Adjustment±10% @ 1 K Ohm 1 watt trimmer
Auxiliary Winding6~150 VAC (No load rms)
Response Time0.3~1 sec. @ ±20% voltage vibration
LAM Voltage Droop Rate10% & 15% selectable
EnvironmentOperating Temperature : -40~60 °C
Storage Temperature : -40~85 °C
Relative Humidity : Maximum 95%
Vibration : 1.5G @ 5~30 Hz / 5.0G @ 30~500 Hz
AVR Controls FunctionsVOLT : Voltage Adjustment
STAB : Stability Adjustment
V/HZ : UFRO Knee Point Set
EXC.MAX : Excitation Current Limit
STAT : Droop Adjustment
Dimensions203.0 (L) x 153.0 (W) x 60.5 (H) mm
Weight970g ±2%


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