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E.1 STO function logic

Reference standards: IEC 61508-1, IEC 61508-2, IEC 61508-3, IEC 61508-4, IEC 62061, ISO 13849-1, IEC 61800-5-2。

You can enable the safe torque off (STO) function to prevent unexpected startups when the main power supply of the drive is not switched off. The STO function switches off the drive output by turning off the drive signals to prevent unexpected startups of the motor (see the following figure). After the STO function is enabled, you can perform some-time operations (such as non-electrical cleaning in the lathe industry) and maintain the non-electrical components of the device without switching off the drive.

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E.1 STO function logic

The following table describes the input states and corresponding faults of the STO function.

STO input state

Corresponding   fault

H1 and H2 opened simultaneously

The STO function   is triggered, and the drive stops running.

Fault code:

40: Safe torque   off (STO)

H1 and H2 closed simultaneously

The STOP function   is not triggered, and the drive runs properly.

One of H and H2 opened, and the other closed

The STL1, STL2, or STL3 fault   occurs.

Fault code:

41: Channel H1 exception (STL1)

42: Channel H2 exception (STL2)

43: Channel H1 and H2 exceptions (STL3)


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