Notes; Using The Safe Disable Function - YASKAWA GA700 Technical Manual

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Notes

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 (including EDM),
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, H2, 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 H2 have opened, it takes up to 3 ms for drive output to shut off completely.
The sequence set up to trigger terminals H1 and H2 should make sure that both terminals remain open for at least 3 ms in order
to properly interrupt drive output.
NOTICE: The Safe Disable Monitor (multi-function output terminal assigned to the EDM function) should not be used for any
other purpose than to monitor the Safe Disable status or to discover a malfunction in the Safe Disable inputs. The monitor
output is not considered a safe output.
NOTICE: Replace drives with a built-in safety function 10 years after its first used.
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Using the Safe Disable Function

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Safe Disable Circuit
The Safe Disable circuit is comprised of two independent channels (terminals H1 and H2) that block the output
transistors. The input can use the internal power supply of the drive.
Set the EDM function to one of the multifunction digital output terminals [H2-xx = 21 or 121] to monitor the
status of the Safe Disable function. This is called the "Safe Disable monitor output function."
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
4.4 Safe Disable Input
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