General
‑14‑
● Before using the safety function, properly understand all the related information.
Note
If the safety function is used incorrectly or the safety function does not meet safety
requirements at the site, physical injuries may arise.
Safety measures
Carefully read and observe the following important precautions when using the safety
function:
● The STO function is not a substitute for the emergency stop (E‑stop) function. If
only the STO function is triggered, with no extra measures taken, and the power
supply cannot be cut off in emergency, high‑voltage parts of the motor and drive
are still energized. This may incur the risk of electric shock or other electricity‑
related risks. Therefore, carry out maintenance of electrical parts of the drive or
motor only after isolating the drive system from the main power supply.
● Depending on standards and requirements for particular applications, STO may be
used as part of an E‑stop system. However, different from the E‑stop function, STO
is designed for use in a dedicated safety control arrangement whose purpose is to
prevent hazards from occurring.
● The E‑stop function is typically provided in a machine to allow operators to notice
unexpected situations and take actions to prevent accidents.
● The design requirements for E‑stop are different from safety interlock. Generally,
E‑stop shall be independent from any complex or intelligent control. It may use
purely electromechanical devices to disconnect the power supply or initiate a
controlled rapid stop using other means such as dynamic or regenerative braking.
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