Precautions; Using The Safe Disable Function - YASKAWA CR700 Technical Manual

4.6 Safe Disable Input

Precautions

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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. 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. 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. 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. 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.
Note:
• When terminals H1 or H2 deactivate, it will be a maximum of 3 ms before the drive will switch to "Safe Torque Off" status. Set the
OFF status for terminals H1 and H2 to hold for 2 ms minimum. If terminals H1 and H2 are activated for less than 2 ms, it is possible
that the drive will not switch to "Safe Torque Off" status.
• 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.
• Drives that have a built-in safety function must be replaced 10 years after the first use.

Using the Safe Disable Function

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Safe Disable Circuit
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The Safe Disable circuit has two isolated channels (terminals H1 and H2). The input channels block 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 = 51 or 151] to monitor the status of the Safe
Disable function. This is the "Safe Disable monitor output function."
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YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual