YASKAWA L1000A Quick Start Manual page 242

C Standards Compliance
Disabling and Enabling the Drive Output ("Safe Torque Off")
Note: Terminals H1, H2, DM+, and DM- on 600 V class models are designed to the functionality, but are not certified to IEC/EN
61800-5-2, ISO/EN 13849 Cat.3, IEC/EN 61508 SIL2, Insulation coordination: class 1.
Figure 111 illustrates a Safe Disable input operation example.
Figure 102
Up/Down Command
Entering the "Safe Torque Off" State
Note: Terminals H1, H2, DM+, and DM- on 600 V class models are designed to the functionality, but are not certified to IEC/EN
61800-5-2, ISO/EN 13849 Cat.3, IEC/EN 61508 SIL2, Insulation coordination: class 1.
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
Note: Terminals H1, H2, DM+, and DM- on 600 V class models are designed to the functionality, but are not certified to IEC/EN
61800-5-2, ISO/EN 13849 Cat.3, IEC/EN 61508 SIL2, Insulation coordination: class 1.
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.
240
Output
Frequency
Run
H1, H2 Input ON (Safe Disable off)
Drive Output
Normal operation
Figure 111 Safe Disable Operation
Motor coasts
to stop
Stop
OFF (Safe Disable activated)
Safe Torque-Off
YASKAWA ELECTRIC TOEP C710616 38H YASKAWA AC Drive-L1000A Quick Start Guide
Drive is ready for
operation
Baseblock (Not Safe!)