YASKAWA L1000A Technical Manual page 429

Returning to Normal Operation after Safe Disable
The Safe Torque-Off state can be left by simply closing both Safe-Disable inputs.
If the Up/Down command is issued before the Safe-Disable inputs are closed, then the drive operation depends on the
setting of parameter L8-88.
• If L8-88 is set to 0, the Up/Down command needs to be cycled in order to start the motor.
• If L8-88 is set to 1 (default), the drive will start the motor immediately when the Safe Torque-Off mode is left, i.e., the
Safe Disable inputs are enabled.
Additionally when L8-88 is set to 1, then parameter S6-16 (Restart after Baseblock Selection) can be used to determine
how the drive behaves when the Safe-Disable inputs are opened and closed while the Up/Down command is kept active.
When S6-16 is set to 0, the drive will not restart (default) and the Up/Down command needs to be cycled. When S6-16 is
set to 1, then the drive will restart as soon as the Safe-Disable inputs are closed.
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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
Input 1, H1-HC Input 2, H2-HC
Off Off
On Off
Off On
On On
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
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,
Should only one of the Safe Disable channels be on while the other is off,
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.
possible errors.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Safe Disable Status Safe Disable Status
Monitor, Monitor,
DM+ - DM– H2-
Off
On
On
On
" "
Hbb will flash in the digital operator display.
Refer to Alarm Codes, Causes, and Possible Solutions on page 269
D.4 Safe Disable Input Function
Drive Output Status
= 58
On Safely disabled, "Safe Torque Off"
On Safely disabled, "Safe Torque Off"
On Safely disabled, "Safe Torque Off"
Off Baseblock, ready for operation
" "
HbbF will flash in the display to indicate that
Digital Operator Display
Hbb (flashes)
HbbF (flashes)
HbbF (flashes)
Normal display
to resolve
D
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