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Wiring
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ASDA -A3
3
3.10.3 Potential risks of STO
After the STO function is activated, the servo drive can no longer control the motor. Hence, you
must evaluate all the potential risks that may result from the activation of the STO function to
ensure safety. Delta is not liable for any mechanical damage and personnel injury caused by the
potential risks.
Do not touch the servo drive after activating the STO function. The STO function stops the
servo drive from supplying power to the motor but does not cut off the power to the servo
drive. Thus, there is a potential risk of electric shock.
When maintaining the servo drive, use the molded-case circuit breaker (MCCB) or
magnetic contactor (MC) to cut off the power to the servo drive.
When the STO function is activated, the servo drive can no longer stop or decelerate the
motor.
The STO function cuts off the power to the motor, but the motor can still be moved by other
external forces.
When installing the machine or changing the servo drive, ensure to check if the STO
function works normally.
The motor may move due to malfunction of the power device, and the maximum moving
range is 180 electrical degrees.
Supply power to the STO input signals with a single power source. If you use a split power
supply, the leakage current may result in STO misoperation. In addition, the STO function
must be powered by the safety extra-low voltage (SELV) power source with reinforced
insulation.
The EDM output signals are not safety output signals, which are used only for failure
monitoring. Incorrect use of the EDM signals may result in personnel injury. When an STO
failure is detected with the EDM signals, keep the STO input signals off.
To avoid malfunction caused by accumulated errors, you must check the safety functions at
least once every 3 months.
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