Automatic Voltage Regulator R448  replaces Leroy Somer R448.PART NUMBERS THE R448 R CAN REPLACE- LEROY SOMER R448 AVR- R448 LS/A - R448 LS/B - R448 LS/C - LEROY SOMER AEM110RE016Features 40VAC Full Load Harmonic+Auxiliary Winding 5 VAC Under Frequency Protection U/F Range 42 ~ 62Hz External Voltage Adjustment ¡À10% @ 1K ¦¸ EMI Suppression Internal Electromagnetic Interference Filtering Voltage Regulation < ¡À1% (with 4% engine governing)Environment Vibration 1.5G @ 5 ~ 30 Hz ¡¡ 5.0G @ 30 ~ 500 Hz Relative Humidity < 95% Operating Temperature -40 ~ 60 ¡ãC Storage Temperature -40 ~ 85 ¡ãCAVR Controls VOLT Voltage Adjustment STAB Stability Adjustment V/HZ UFRO Knee Point Set EXC.MAX Excitation Current Limit STAT Droop Adjustment