E1 Series Servo Drive User Manual Safety Function
12-2 HIWIN MIKROSYSTEM CORP.
12.1 Overview of STO safety function
12.1.1 Introduction to STO safety function
The built-in STO safety function aims to avoid personnel injury caused by machine moving parts as well
as to improve safety and reduce risk. It is able to protect operation personnel as machine malfunctions or
is maintained.
12.1.2 Safety precautions for STO safety function
Ensure STO safety function complies with the safety requirement of your application. Improper usage may
cause injury.
When STO safety function is enabled, the motor could still be moving due to external force, such as gravity on
vertical axis. Use mechanical brake as protection. Improper usage may cause injury.
If the servo drive malfunctions as STO safety function is enabled, the motor could move within a small range
(within half of magnetic pole pair pitch).
STO safety function is independent from dynamic brake or brake. Ensure there is no danger if these
components malfunction when STO safety function is enabled.
When STO safety function is used as emergency stop function, please be noted that only the power supplied
to the internal power module of the servo drive will be cut off. The main circuit power can still be normally input,
so another device must be installed to cut off the main circuit power. Improper usage may cause injury.
STO safety function must only be used for emergency and cannot be used to cut off the power of the servo
drive. Use other measure to cut off the power of the servo drive for maintenance.
12.2 STO safety function
STO safety function stands for safe torque off function. When STO safety function is enabled, the power
supplied to the internal power module of the servo drive will be cut off by hardware to provide protection.
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