Leroy Somer Alternator Automatic Voltage Regulators AVR R448
R448 Automatic Voltage Regulator (AVR) provides closed loop control of the alternator output voltage by regulating the exciter field current. The primary winding has a voltage in ratio to that of the alternator (characteristic shunt), the next has a voltage in proportion to the stator current (compound characteristic: booster effect). Which is powered by two auxiliary windings which are independent of the voltage equal circuit. The power supply voltage is rectified and filtered before being used by the AVR monitoring transistor. With PMG excitatioin, a permanent magnet generator (PMG) added to the alternator supplies the AVR with voltage which is free of the main alternator winding. This is built-in at the rear of the machine and connected to the R448 AVR, and the ST9 jumper must be disconnected.
*Quadrature droop adjustment
*AVR Voltage adjustment
*LAM Threshold (underspeed) adjustment
*Excitation ceiling adjustment
*Selection of single phase or three phase
*Selection of normal or rapid response time
*50 Hz or 60 Hz frequency option
*Remote voltage adjustment option
*LAM enable/disable option
*Alternator frame selection
*Excitation system selection
Input voltage: 70-140V AC, (PMG, or auxiliary winding, single, three phases)
Reaction is measured : 90-480V AC
MAX. output :DC 10A 125V
Function: Built-in low-speed , over excitation LAm
|Voltage regulation||± 0.5%|
|Remote voltage adjustment range||± 5%|
|Short circuit capability||3 x Irated for 10 seconds|
|Voltage sensing||95 to 140 volts (50/60 Hz)|
|170 to 260 volts (50/60 Hz)|
|340 to 520 volts (50/60 Hz)|
|Response time||Normal (1 sec) for ± 20% voltage variation|
|Rapid (0.3 sec) for ± 20% voltage variation|
terminal 0-220V =170-260V
|Voltage input||40-50VAC, 3 phase|
|Harmpnic auxiliary winding||6-150VAC (no-load rms)|
|Output Voltage||max 160VDC at 120VAC input|
|Resistance||15 ohms minimum|
|Regulation||+/-5% RMS with 4% engine governing|
|Voltage build-up||Residual voltage at avr terminal≥5VAC|
|External Voltage Adjustment||+/-10% with 1k ohm 1 watt trimmer|
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1. Guarantee:1 year after selled.
2. During guarantee,the items share free repairs or replacement.
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