YASKAWA LA500 Manual De Instrucciones página 39

The "Safe Torque Off" status is only possible with the Safe Disable function. Clear the Run
command to stop the drive. Turning off drive output (a baseblock condition) ≠ "Safe Torque
Off".
Note:
• When it is necessary to ramp to stop the motor, do not turn off terminals H1 and H2 until the motor fully stops. This
will prevent the motor from coasting to stop during usual operation.
• A maximum of 3 ms will elapse from when terminals H1 or H2 shut off until the drive switches to the "Safe Torque
Off" status. Set the OFF status for terminals H1 and H2 to hold for at least 3 ms. The drive may not be able to switch
to the "Safe Torque Off" status if terminals H1 and H2 are only open for less than 3 ms.
Going from "Safe Torque Off" to Usual Operation
The safety input will only release when there is no Run command.
• During Stop
When the Safe Disable function is triggered during stop, close the circuit between terminals
H1-HC and H2-HC to disable "Safe Torque Off". Enter the Run command after the drive
stops correctly.
• During Run
If you trigger the Safe Disable function during run, clear the Run command, then close the
circuit between terminals H1-HC and H2-HC to disable "Safe Torque Off". Enter the Stop
command, then enter the Run command when terminals H1 and H2 are activated.
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Validating the Safe Disable Function
After you replace parts or do maintenance on the drive, complete all necessary wiring to start the
drive, then follow these steps to test the Safe Disable input. Keep a record of the test results.
1. When the two input channels are OFF (Open), make sure that the keypad flashes STo [Safe
Torque OFF], and make sure that the motor is not running.
2. Monitor the ON/OFF status of the input channels and make sure that MFDO set to the
EDM function operates as shown in
If one or more of the these items are true, the ON/OFF status of the MFDO may not display
correctly on the keypad.
• Incorrect parameter settings.
• A problem with an external device.
• The external wiring has a short circuit or is disconnected.
• There is damage to the device.
Find the cause and repair the problem to correctly display the status.
3. Make sure that the EDM signal operates during usual operation as shown in
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Safe Disable Monitor Output Function and Keypad Display
Refer to Table 1.13 for information about the relation between the input channel status, Safety
monitor output status, and drive output status.
YASKAWA TOMPYEULA5001C LA500 Installation and Operation Instructions
Table 1.13.
1 English
Table 1.13.
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