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Precautions
DANGER! Sudden Movement Hazard. Make sure the whole system or machinery in which the Safe Disable function is used complies with
safety requirements. When implementing the Safe Disable function into the safety system of a machine, perform a thorough risk assessment
for the entire system to assure compliance with relevant safety norms. Improper use of the Safe Disable function will cause serious injury
or even death.
DANGER! Sudden Movement Hazard. An external holding brake and dynamic break are not considered to be safety components for drives.
Even when using an external holding brake or dynamic brake with a drive output signal, it is still not considered a safe system because the
drive output signal is not a safety component. A system is required that satisfies safety requirements. Failure to comply will cause death or
serious injury.
DANGER! Sudden Movement Hazard. Connect the Safe Disable inputs to the devices in compliance with safety requirements. Failure to
comply will cause death or serious injury.
WARNING! Sudden Movement Hazard. When using a PM motor, even if the drive output is shut off by the Safe Disable function, a breakdown
of two output transistors can cause current to flow through the motor winding, resulting in a motor output axis movement for a maximum
angle of 180 degrees (electrically). Make sure such a situation would have no effect on the safety of the application when using the Safe
Disable function. Failure to comply could cause serious injury or death.
WARNING! Electrical Shock Hazard. The Safe Disable function can switch off the drive output, but does not cut the drive power supply and
cannot electrically isolate the drive output from the input. Always shut off the drive power supply when performing maintenance or installations
on the drive input side as well as the drive output side. Failure to comply could cause serious injury or death.
WARNING! Sudden Movement Hazard. The motor will move when an external gravitational force in the vertical axis is applied even if the
Safe Disable function is in operation. Failure to comply could cause serious injury or death.
WARNING! Sudden Movement Hazard. When using the Safe Disable inputs, make sure to remove the wire links between terminals H1 and
HC that were installed prior to shipment. Failure to do so will keep the Safe Disable circuit from operating properly and could cause death
or serious injury.
WARNING! Sudden Movement Hazard. All safety features (including Safe Disable) should be inspected daily and periodically. If the system
is not operating normally, this could cause death or serious injury.
WARNING! Sudden Movement Hazard. Only a qualified technician with a thorough understanding of the drive, the instruction manual, and
safety standards should be permitted to wire, inspect, and maintain the Safe Disable input. Failure to comply could cause death or serious
injury.
NOTICE: From the moment terminal inputs H1 and HC have opened, it takes up to 1 ms for drive output to shut off completely. The sequence
set up to trigger terminals H1-HC should make sure that terminals H1-HC remain open for at least 1 ms in order to properly interrupt drive
output.
NOTICE: Drives with safety-related functions need to be replaced after 10 years of use.
D.4 Safe Disable Input
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YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual