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8 Safety Function
8
-2
G5 Series AC Servo Drives With Built-in EtherCAT Communications, Linear Motor Type
8
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Safe Torque OFF Function
The safe torque OFF function (hereinafter referred to as STO according to IEC 61800-5-2) is used to
cut off the motor current and stop the motor with the input signals from a safety device, such as a safety
controller or safety sensor.
When the STO function is operating, the
Servo Drive
turns OFF the servo ready completed output
(READY) to go into the safety status.
To connect a Servo Drive to safety devices such as a safety controller or a safety sensor, use the safety
connector (CN8).
The PFH value is 2.30
10
8
.
Precautions for Safe Use
•
When using the STO function, be sure to execute a risk assessment of the equipment to
confirm that the system safety requirements are met.
•
There are the following risks even when the STO function is operating. Be sure to take safety
into account as part of the risk assessment.
•
The motor runs if an external force is present. If holding is required, implement appropriate
measures, such as providing external brakes.
•
Even if there is no external force, when the Fault reaction option code (605E hex) is set to
free-run with the dynamic brake disabled, the motor uses free-run stopping and the stop
distance is long.
•
In case of internal failure of components, the motor may operate in the range of up to 180
degrees of electrical angle.
•
The power supply to the motor is cut off by the STO function, but the power supply to the
Servo Drive
will not be cut off nor electrically isolated. For
Servo Drive
maintenance, cut off the
power supply to the
Servo Drive
through another means.
•
Do not use the EDM output for any purpose other than the failure monitoring function. The
EDM output signal is not a safety output.
•
The dynamic brake and external brake release signal outputs are not safety-related parts.
Make sure to design the equipment not to be dangerous even if the external brake release fails
during the STO status.
•
When using the STO function, connect equipment that meets the safety standards.
Precautions for Correct Use
Precautions for Correct Use
According to EN61800-5-2, the safety function is referred to as the "Safe torque off" function
using the word "torque" instead of force. Read it as "force" when using this function.