YASKAWA A1000 Technical Manual page 253

If Safe Disable was activated during stop, turn on both Safe Disable inputs by deactivating "Safe Torque Off" to resume normal
operation.
If Safe Disable was activated during run, remove the Run command then turn on the Safe Disable inputs before restarting the
drive.
n Safe Disable Monitor Output Function and Digital Operator Display
Note: Terminals H1, H2, DM+, and DM- on 600 V class models are designed to the functionality, but are not certified to EN61800-5-1, ISO13849
Cat. 3, IEC/EN61508 SIL2, Insulation coordination: class 1.
Table C.8 explains the drive output and Safe Disable monitor state depending on the Safe Disable inputs.
Safe Disable Input Status
Input 1, H1-HC
OFF
ON
OFF
ON
Safe Disable Status Monitor
Note: Terminals H1, H2, DM+, and DM- on 600 V class models are designed to the functionality, but are not certified to EN61800-5-1, ISO13849
Cat. 3, IEC/EN61508 SIL2, Insulation coordination: class 1.
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
Note: Terminals H1, H2, DM+, and DM- on 600 V class models are designed to the functionality, but are not certified to EN61800-5-1, ISO13849
Cat. 3, IEC/EN61508 SIL2, Insulation coordination: class 1.
When both Safe Disable inputs are open, "Hbb" will flash in the digital operator display.
If one Safe Disable channel is 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 140
YASKAWA ELECTRIC TOEP C710616 41B YASKAWA AC Drive - A1000 Quick Start Guide
Table C.8 Safety Input and EDM Terminal Status
Safe Disable Status
Input 2, H2-HC
OFF
OFF
ON
ON
Monitor, Drive Output Status
DM+ DM-
Safely disabled,
OFF
"Safe Torque Off"
Safely disabled,
ON
"Safe Torque Off"
Safely disabled,
ON
"Safe Torque Off"
Baseblock,
ON
ready for operation
to resolve possible errors.
C.3 Safe Disable Input Function
Digital Operator Display
Hbb (flashes)
HbbF (flashes)
HbbF (flashes)
Normal display
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