n
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 use either 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 Safe Disable terminals DM+ and DM-. Refer to
Output
Terminals on page 42
for signal specifications when using this output.
Additionally, a Safe Disable monitor function can be assigned to a digital output (H2-oo = 58).
24 Vdc
Power Module
Safety
Outputs
Motor
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
N.C.
N.O.
Slide Switch S6
(ETC742611 and later)
N.C.
N.O.
Slide Switch S6
(ETC742610)
or
Figure i.83 Safe Disable Function Wiring Example (Source Mode)
n
Disabling and Enabling the Drive Output (“Safe Torque Off”)
Figure i.84 illustrates the Safe Disable input operation.
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
Figure i.84 Safe Disable Operation
Entering the “Safe Torque Off” State
When one or both Safe Disable inputs are 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.
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.
i.9 Standards Compliance
114
YASKAWA ELECTRIC TOEP C710636 04D U1000 Industrial MATRIX Drive Quick Start Guide
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