8 Safe Disable Input Function
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YASKAWA Europe TOEP C710606 96A - AC Drive A1000 IP54 Wallmount - Quick Start Guide
Disabling and Enabling the Drive Output (“Safe Torque Off”)
The diagram below illustrates the Safe Disable input 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, then the motor 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 Run
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 Disable function can only be deactivated when a Run command is not active.
When Safe Disable was activated during stop, normal operation can be resumed by simply turning on both Safe Disable
inputs (i.e., by deactivating “Safe Torque Off”).
When Safe Disable was activated during run, first the Run command has to be removed and then the Safe Disable inputs
have to be turned on before the drive can be restarted.
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+ - 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)
24V
Safety
Outputs
Power Module P
N
M
Gate Block 2
Gate Block 1
Control
Circuit
Main Power
H1
H2
HC
Drive
Jumper S3
Setting:
SOURCE
>=1
DM+
DM-
Feedback
Safety Relay or PLC
with safety functionality
H1, H2 Input
Drive Output
ON (Safe Disable off)
Normal operation
OFF (Safe Disable activated)
Safe Torque-Off
Run Command
Run
Stop
Baseblock (Not Safe!)
Output
Frequency
Motor coasts
to stop
Run Command must be
released to deactivate
Safe Disable
Drive is ready for
operation
