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What is your typical DC buss voltage level?
What sort of motor are you using: 3-phase AC, BLDC, etc?
If the motor phase voltage exceeds ~55 volts then the opto isolator is being over-driven and will likely blow.
What sort of motor are you using: 3-phase AC, BLDC, etc?
If the motor phase voltage exceeds ~55 volts then the opto isolator is being over-driven and will likely blow.