... ,MX321,MX341, R448,R449,R230,YH-8A,YH-12A,etc. AVR for generator SX440 is a half-wave phase-controlled thyristor ... type Automatic Voltage Regulator(AVR) and forms part of the excitation system for a brushless ... note 1)Thermal drift0.04% per deg. C change in AVR ambient (note 2) Typical system responseAVR response20 msFiled current to ...