Efficient Networks S120 manual Safe Torque Off STO, Functional features of Safe Torque Off

Models: S120

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Safety Integrated basic functions 9.3 Safe Torque Off (STO)

CAUTION

The "automatic restart" function may not be used together with the safety functions STO/SBC and SS1. The reason for this is that EN 60204 Part 1 (1998) in chapter 9.2.5.4.2 does not permit this (merely de-selecting a safety shutdown function must not cause the machine to restart).

NOTICE

Components cannot be deactivated via p0105, for example, with activated Safety functions.

9.3Safe Torque Off (STO)

General description

In conjunction with a machine function or in the event of a fault, the "Safe Torque Off (STO)" function is used to safely disconnect the torque-generating motor power supply.

When the function is selected, the drive unit is in a "safe status". The power-on disable function prevents the drive unit from being restarted.

The two-channel pulse inhibit integrated in the Motor Modules / Power Modules is a basis for this function.

Functional features of "Safe Torque Off"

This function is integrated in the drive; this means that a higher-level controller is not required.

The function is drive specific, that is, it must be commissioned individually on a drive-by- drive basis.

Enable of the function using parameters required.

When the "Safe Torque Off" function is selected:

The motor cannot be started accidentally.

The pulse disable safely disconnects the torque-generating motor power supply.

The power unit and motor are not electrically isolated.

WARNING

Appropriate measures must be taken to ensure that the motor does not move once the motor power supply has been disconnected ("coast down") (e.g. enable the "Safe Brake Control" function with a vertical axis).

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Drive Functions

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

Page 308
Image 308
Efficient Networks S120 manual Safe Torque Off STO, Functional features of Safe Torque Off