Using The Safe Disable Function - YASKAWA L1000A Technical Manual

D.4 Safe Disable Input Function

◆ Using the Safe Disable Function

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Safe Disable Circuit
The Safe Disable circuit consists of two independent input channels that can block the output transistors (terminals H1
and H2). The input can either use the drive internal power supply or an external power supply. Use jumper S3 on the
terminal board to select between Sink or Source mode with either internal or external power supply.
A photocoupler output is available to monitor the status of the Safe Disable terminals.
page 70 for signal specifications when using this output.
Additionally a Safe Disable monitor function can be assigned to one of the digital outputs (H2-
Figure D.10
Safety Relay or PLC
with safety functionality
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Disabling and Enabling the Drive Output ("Safe Torque Off")
Figure D.11 illustrates a Safe Disable input operation example.
Figure D.11
Up/Down Command
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.
428
Safety
Outputs
Feedback
Figure D.10 Safe Disable Function Wiring Example (Source Mode)
Output
Frequency
Run
H1, H2 Input ON (Safe Disable off)
Drive Output Normal operation
Figure D.11 Safe Disable Operation
24 Vdc
Control
HC
Circuit
Jumper S3
Setting:
SOURCE
H1
Gate Block 1
H2
Gate Block 2
DM+
>=1
DM-
Drive
Motor coasts
to stop
Stop
OFF (Safe Disable activated)
Safe Torque-Off
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Refer to Output Terminals on
= 58).
Main Power
N Power Module P
M
Drive is ready for
operation
Baseblock (Not Safe!)