Siemens SINAMICS S120 Function Manual page 647

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Unplanned motor motion

After the energy feed has been disconnected (STO active) the motor can undesirably move

(e.g. the motor can coast down), therefore presenting risk to persons.

● Take suitable measures to prevent undesirable movement, e.g. by using a brake with

Danger due to short, limited movements

If two power transistors simultaneously fail in the power unit (one in the upper and one in the

lower inverter bridge), then this can cause cause brief, limited movement.

The maximum movement can be:

● Synchronous rotary motors: Max. movement = 180° / no. of pole pairs

● Synchronous linear motors: Max. movement = pole width

Enabling the "Safe Torque Off" function (Basic Functions)

The "Safe Torque Off" function is enabled via parameter p9601:

● STO for the Safety Integrated Basic Functions:

– p9601 = 1 hex (Basic Functions via onboard terminals)

– p9601 = 8 hex (Basic Functions via PROFIsafe)

– p9601 = 9 hex (Basic Functions via PROFIsafe and onboard terminals)

– p9601 = 40 hex (basic functions via TM54F)

– p9601 = 41 hex (basic functions via TM54F and onboard terminals)

● STO via PROFIsafe:

– p9601.0 = 0

– p9601.2 = 0

– p9601.3 = 1

● STO via PROFIsafe and onboard terminals:

– p9601.0 = 1

– p9601.2 = 0

– p9601.3 = 1

Drive functions

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

safety-relevant monitoring. For additional information, see Chapter "Safe Brake Control

(SBC) (Page 651)".

Safety Integrated Basic Functions

11.4 Safe Torque Off (STO)