D.4 Safe Disable Input Function
520 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
■ Safe Disable Monitor Output Function and Digital Operator Display
Table D.6 explains the drive output and Safe Disable monitor state depending on the Safe Disable inputs.
Table D.6 Safety Input and EDM Terminal Status
Safe Disable Status Monitor
With the Safe Disable monitor output (terminals DM+ and DM-), the drive provides a safety status feedback signal. This
signal should be read by the device that controls the Safe Disable inputs (PLC or a safety relay) in order to prohibit
leaving the “Safe Torque Off” status in case the safety circuit malfunctions. Refer to the instruction manual of the safety
device for details on this function.
Digital Operator Display
When both Safe Disable inputs are open, “Hbb” will flash in the digital operator display.
Should only one of the Safe Disable channels be on while the other is off, “HbbF” will flash in the display to indicate that
there is a problem in the safety circuit or in the drive. This display should not appear under normal conditions if the Safe
Disable circuit is utilized properly. Refer to Alarm Codes, Causes, and Possible Solutions on page 319 to resolve
possible errors.
Safe Disable Input Status
Safe Disable Status Monitor,
DM+ - DM-
Drive Output Status Digital Operator Display
Input 1, H1-HC Input 2, H2-HC
OFF OFF OFF Safely disabled, “Safe Torque Off” Hbb (flashes)
ON OFF ON Safely disabled, “Safe Torque Off” HbbF (flashes)
OFF ON ON Safely disabled, “Safe Torque Off” HbbF (flashes)
ON ON ON Baseblock, ready for operation Normal display
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