This AVR has three indicating LEDs (clear type, when they glow RED) and they are.
- UF (Shows Under Frequency, indicating low speed of prime mover)
- OE - Over Excitation (The excitation voltage/current drawn by alternator is more than maximum value)
- SL - Sensing Lead open (Sensing lead U-V is open circuited).
- OE - To set Excitation Limit
- UF - To set Under frequency cut off
- S - To set the voltage stability
- V - To set the output Voltage.