Notes; Using The Safe Disable Function - YASKAWA GA800 Technical Reference

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Notes

DANGER! Sudden Movement Hazard. When you use the Safe Disable function in the safety system of a machine, do a full risk
assessment for the system to make sure that all parts of the system comply with applicable safety standards. Incorrect application of
the Safe Disable function can cause serious injury or death.
DANGER! Sudden Movement Hazard. If the output circuit of the drive is damaged and the Safe Disable function turns OFF the drive
output to a permanent magnet (PM) motor, the motor can rotate 180 electrical degrees. Prevent damage to equipment and injury to
personnel during this condition. Sudden motor movement can cause serious injury or death. It is possible for current to flow through
the motor winding in these conditions.
DANGER! Electrical Shock Hazard. You cannot depend on the Safe Disable function to prevent electrical shock. Disconnect all
power to the drive and wait for the time specified on the warning label before you remove covers. Check the drive for dangerous
voltages before servicing or repair work. If you do work on the drive when it is energized and there is no cover over the electronic
circuits, it can cause serious injury or death.
WARNING! Sudden Movement Hazard. Although the Safe Disable function is in operation, gravity or other external forces in the
vertical axis can move the motor. Incorrect application of the Safe Disable function can cause serious injury or death.
WARNING! Sudden Movement Hazard. Do not use the drive output signals to control external holding brakes or dynamic brakes for
functional safety. Use a system that conforms to the functional safety requirements. Incorrect application of the Safe Disable
function can cause serious injury or death. Systems that use drive output signals (including EDM) for safety are not safe because
drive output signals are not safety components.
WARNING! Sudden Movement Hazard. Connect the Safe Disable inputs to the devices as specified by the safety requirements. If
you connect the Safe Disable inputs incorrectly, it can cause serious injury or death.
WARNING! Sudden Movement Hazard. To use the Safe Disable inputs, remove the jumpers between terminals H1-HC and H2-HC.
If the Safe Disable circuit does not work correctly, it can cause serious injury or death.
WARNING! Sudden Movement Hazard. When you clear the Safe Disable input, make sure that the Safe Disable Monitor output
operates correctly as the specification for Safe Disable function. If the Safe Disable circuit does not operate correctly, it can cause
serious injury or death.
WARNING! Sudden Movement Hazard. Regularly examine the Safe Disable input and all other safety features. A system that does
not operate correctly can cause serious injury or death.
WARNING! Sudden Movement Hazard. Only let approved personnel who know about the drive, instruction manual, and safety
standards wire, examine, and maintain the Safe Disable input. If personnel are not approved, it can cause serious injury or death.
WARNING! Sudden Movement Hazard. Only use the Safe Disable Monitor (multi-function output terminal set to the EDM function)
to monitor the Safe Disable status or to find a malfunction in the Safe Disable inputs. The monitor output is not a safety output. If you
use the Safe Disable Monitor incorrectly, it can cause death or serious injury.
Note:
• When you use a drive with a built in safety function, you must replace it 10 years after first use.
• A maximum of 3 ms will elapse from when terminals H1 or H2 shut off until the drive switches to the "Safe Torque Off" status. Set the OFF
status for terminals H1 and H2 to hold for at least 3 ms. The drive may not be able to switch to the "Safe Torque Off" status if terminals H1
and H2 are only open for less than 3 ms.
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Using the Safe Disable Function

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Safe Disable Circuit
The Safe Disable circuit has two isolated channels (terminals H1 and H2) that stop the output transistors. The input
can use the internal power supply of the drive.
Set the EDM function to one of the MFDO terminals [H2-xx = 21 or 121] to monitor the status of the Safe Disable
function. This is the "Safe Disable monitor output function".
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
5.6 Safe Disable Input
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