D.4 Safe Disable Input Function
■ Safe Disable Monitor Output Function and Digital Operator Display
The table below explains the drive output and Safe Disable monitor state depending on the Safe Disable inputs.
Safe Disable Input Status
Safe Disable Status
Monitor,
DM+ D M -
Safe Disable Status
Monitor,
H 2-D D = 58
Drive Output Status
Digital Operator Display
Input 1, H1-HC
Input 2, H2-HC
O ff
O ff
O ff
On
Safely disabled, “Safe Torque Off”
Hbb (flashes)
On
O ff
On
On
Safely disabled, “Safe Torque Off”
HbbF (flashes)
O ff
On
On
On
Safely disabled, “Safe Torque Off”
HbbF (flashes)
On
On
On
O ff
Baseblock, ready for operation
Normal display
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 O ff’ status in case the safety circuit malfunctions. Refer to the instruction manual o f the safety
device for details on this function.
Digital Operator Display
In contrast to terminals DM+/DM-, the safe disable monitor function that can be programmed for a digital output (H2-
□ □ = 58) is a software function and can be used for EN81-1 conform one contactor solutions but not as an EDM signal
according to EN61800-5-1.
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 253
to resolve
possible errors.
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YASKAWA ELECTRIC SIEP C710616 33D YASKAWA AC Drive L1000A Technical Manual