Delta ASD-A3-0121, Руководство пользователя

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ASDA-A3 Wiring
Revision December, 2017
3-51
3
3.10 STO function (Safe torque off)
3.10.1 Introduction to STO
Once the STO function is activated, the servo drive stops supplying current to the motor, cutting
off the power supply and torque force.
Note:
1. The STO function is supported by the A3-M only.
2. STO certification application in progress.
3.10.2 The potential danger of STO
After the STO function is activated, the motor is no longer controlled by the servo motor. Thus,
the potential danger from STO must be taken into consideration when designing and wiring the
machine. Delta is not liable for mechanical damage and personnel injury if you fail to observe the
following instructions:
1. For a safety circuit design, make sure the selected components conform to the safety
specifications.
2. Before installation, read the safety instructions in the STO-related user manual for the
components you use.
3. To avoid electric shock, do not touch the servo drive even when the STO function is activated.
Although the power to the motor is cut off, there is residual electricity since the power supply
is not completely removed from the servo drive.
4. When the STO function is enabled, the servo drive can no longer control, stop or decelerate
the motor.
5. After the STO function is activated, the servo drive no longer controls the motor, but the
motor can still be moved by other external forces.