how you check SCR firing or not? in live 3 phase bridge rectifier unit(3 in neg

how you check SCR firing or not? in live 3 phase bridge rectifier unit(3 in neg and 3 in pos),explain please

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how you check SCR firing or not? in live 3 phase bridge rectifier unit(3 in neg and 3 in pos),explai..

Answer / sephjo28

check with oscilloscope,if there any train of pulses missing in out put then
check carefully oscilloscope screen there is any waves missing
if missing one the bridge not work
next step check each rectifier gates...if there firing pulse
available or not if not or check gate pulse amplifier
........>>>>

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