19 Safe Disable Input
124 YASKAWA TOEPC71061723A YASKAWA AC Drive CR700 Quick Start Guide
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
■ Safe Disable Circuit
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.”
Figure 19.2 Safe Disable Function Wiring Example
■ Enabling and Disabling the Drive Output (“Safe Torque Off”)
Refer to Figure 19.3 for an example of drive operation when the drive changes from “Safe Torque Off” status to
usual operation.
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