YASKAWA L1000V Technical Manual page 263

Figure C.10
Safety Relay or PLC
with safety functionality
n
Disabling and Enabling the Drive Output ("Safe Torque Off")
Figure C.11 illustrates a Safe Disable input operation example.
Figure C.11
Up/Down Command
Drive Output
Entering the "Safe Torque Off" State
Whenever the Safe Disable input opens, the motor torque is shut off by switching off the drive output. If the motor was
running before the Safe Disable input 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 the Safe-Disable input.
If the Up/Down command is issued before the Safe-Disable input is 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 input is 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 input is 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 input is closed.
YASKAWA EUROPE SIEP
HC
Safety
Outputs
Feedback
H1
P1
PC
Drive
Figure C.10 Safe Disable Function Wiring Example
Output
Frequency
Run
H1 Input ON (Safe Disable off)
Normal operation
Figure C.11 Safe Disable Operation
YASKAWA AC Drive L1000V Technical Manual
Internal
Control
Supply
Circuit
CH1
Gate Block 1
CH2
Gate Block 2
>=1
Motor coasts
to stop
Stop
OFF (Safe Disable activated)
Safe Torque-Off Baseblock (Not Safe!)
C.4 Safe Disable Input Function
Main Power
N Power Module P
M
Drive is ready for
operation
C
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