Hi I use this circuit to detect phase loose, so if one of the phase lost , the phase loss signal will be high, the problem in this circuit are.
1-if the input voltage less at 50% it give phase loss , i did try to increase the resistors (R99,R100 and R102) this make work but it cause another problem
is when i have phase loss and if input voltage more than 380Vac , the circuit does not detect phase loss becuase all optocoupler are on.
So how can i make this circuit work right like if i loss one phase , the phase loss signal be high and is not turn off at high input voltage and also how can avoid getting phase loss when the voltage at less than 50%
1-if the input voltage less at 50% it give phase loss , i did try to increase the resistors (R99,R100 and R102) this make work but it cause another problem
is when i have phase loss and if input voltage more than 380Vac , the circuit does not detect phase loss becuase all optocoupler are on.
So how can i make this circuit work right like if i loss one phase , the phase loss signal be high and is not turn off at high input voltage and also how can avoid getting phase loss when the voltage at less than 50%