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What exactly error E1301 means in Lexium 32 range of servo drives. What precaution need to be taken to overcome it.

 Error E1301 appears if STO (Safe Torque Function) is not triggered via two redundant inputs STO A and STO B
simultaneously. It means if STO A and STO B remains at different logic level (ON or OFF) for period greater than
1 second then servo trips on E1301. Precaution is required that both inputs STO A and STO B turned ON or
activated simultaneously without any delay in between them.
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