Figure 106, Illustrates a safe disable, C standards compliance – Yaskawa L1000E AC Drive CIMR-LEA User Manual
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C Standards Compliance
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YASKAWA TOEPYAIL1E01A YASKAWA AC Drive L1000E Quick Start Guide
Figure 97
Figure 106 Safe Disable Operation
Entering the “Safe Torque Off” State
Whenever either one Safe Disable input or both inputs open, the motor torque is shut off by switching off the drive output.
If the motor was running before the Safe Disable inputs opened, it will coast to stop, regardless of the stopping method set
in parameter b1-03.
Notice that the “Safe Torque Off” state can only be achieved using the Safe Disable function. Removing the Up/Down
command stops the drive and shuts the output off (baseblock), but does not create a “Safe Torque Off” status.
Note: To avoid an uncontrolled stop during normal operation, make sure that the Safe Disable inputs are opened first when the motor
has completely stopped.
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.
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 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.
Safe Disable Input Status
Safe Disable Status
Monitor,
DM+ - DM–
Safe Disable Status
Monitor,
H2-
= 58
Drive Output Status
Digital Operator
Display
Input 1, H1-HC Input 2, H2-HC
Off
Off
Off
On
Safely disabled, “Safe Torque Off”
Hbb (flashes)
On
Off
On
On
Safely disabled, “Safe Torque Off”
HbbF (flashes)
Off
On
On
On
Safely disabled, “Safe Torque Off”
HbbF (flashes)
On
On
On
Off
Baseblock, ready for operation
Normal display
H1, H2 Input
Drive Output
ON (Safe Disable off)
Normal operation
OFF (Safe Disable activated)
Safe Torque-Off
Up/Down Command
Run
Stop
Baseblock (Not Safe!)
Output
Frequency
Motor coasts
to stop
Drive is ready for
operation