Views: 0 Author: XD laser Publish Time: 2021-04-12 Origin: XD laser
STO Safe Torque Off (STO, Safe Torque Off) function is to prevent the motor from producing torque when the motor stops, so that the machine becomes a part of the safety system; the following uses Yaskawa Servo as an example to explain in detail how to implement the STO function electrically.
The 24V power supply is connected to the CN8 interface of the Yaskawa servo drive through the 3 NO contacts of the safety relay, and the STO function is realized by cutting off the motor current through hardware. The specific operation process is as follows: After pressing the emergency stop button SB1, the NO contact of the safety relay is disconnected, and the 24V power supply of the CN8 interface of the servo drive is disconnected. By blocking the drive signal of the power module that controls the motor current, the power module can be turned off. Cut off the motor current to realize the STO function. Reset operation, after resetting the emergency stop SB1 button, press the SB2 reset button again, the safety relay resets the NO contact, and the 24V power supply normally supplies power to the CN8 interface. The motor returns to normal.
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Safety interface description of Yaskawa drive
Note: After resetting the emergency stop button SB1, you must press the SB2 reset button again, the safety relay can be reset, and the Yaskawa servo motor can return to normal.
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