Risk Assessment
The device manufacturer is responsible for the residual risks associated with all risk assessments. The
following are residual risks associated with STO functions. ESTUN is not responsible for any damage or
injury caused by residual risks.
Never touch the terminals while the power is on.
Since the STO function only cuts off the torque output of the Motor and
does not cut off the physical connection between the Drive and the
Motor, there is a risk of electric shock.
Use products that have been safety-confirmed or meet safety
specifications for parts used on safety circuits.
Since the STO function can cut off the torque output of the Motor, make
sure that the Motor does not move due to external forces.
Please confirm whether the new product and the previously used
product are the same model when replacing the Drive.
Always confirm the performance of the function before running the
system.
Please conduct a risk assessment of the entire machine or device.
When the power module inside the Drive has a short-circuit fault, the
Motor shaft may turn 0.5 rotations or less.
Always supply power the STO input signals (HWBB1 and HWBB2) from
a same source.
If the power is supplied separately, the leakage current may cause the
STO function to malfunction and unable to cuts off the torque output of
the Motor.
Please use the PELV/SELV switching power supplying to the IO signal of
the STO function.
Alarms
If A30 (STO Disconnected) alarm or A31 (STO Circuit Failure) alarm occurs in the Drive, which means
that the STO function circuit may be damaged. The user should troubleshoot to use the STO function
again.
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