Safe Disable Circuit - YASKAWA LA500 Installation And Operation Instruction Manual

Note:
EDM = External Device Monitoring
PFD = Probability of Failure on Demand
PFH = Probability of Dangerous Failure per Hour
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Precautions and 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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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.
YASKAWA TOMPYEULA5001C LA500 Installation and Operation Instructions
1 English
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