LS ELECTRIC L7NHF Series, Руководство пользователя

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6. Safety Functions
6-5
6.4
How to Verify the Safety Function
In case the servo drive was replaced prior to starting up the device or during maintenance, make sure
to check the details below:

When the STO1 and STO2 signals are turned off, check if the drive is in STO status (Bit 31 for
digital input (0x60FD) is 1).

Make sure that the EDM signal is off during general operation by checking the input indicator for
feedback circuit of the connected device.
6.5
Precautions for Using the Safety Function

When using the STO function, be sure to carry out risk assessments for the device to check if the
system safety requirements are met.

There may be risks even if the STO function works.

In the STO state, the motor is operated by an external force; thus, if the load needs to be
maintained, arrange a separate measure such as an external mechanical brake. The brake of the
servo system is dedicated for maintaining the load; thus, be careful not to use it to brake the motor.

If no external force exists and free-run stop is configured in the dynamic brake control mode
(0x2012), note that the braking distance of load will be extended.

The purpose of the STO function is not to block the servo drive power or electrically insulate the
drive. That is why you have to disconnect the servo drive power before carrying out maintenance of
any sub-drive.