Siemens SINAMICS S120 Function Manual page 682

Safety Integrated Basic Functions
10.4 Safe Torque Off (STO)
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
Unplanned motor motion
Undesirable motor motion
defective (breakdown of the depletion layer). This can result in accidents leading to death
or severe injury.
• Take suitable measures to prevent undesirable movement, e.g. by using a brake with
The maximum movement can involve:
1)
● Synchronous rotary motors: Max. movement = 180° / no. of pole pairs
● Synchronous linear motors: Max. movement = pole width
Enabling the "Safe Torque Off" function
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
682
WARNING
safety-relevant monitoring. For additional information, see Section "Safe Brake Control
(SBC) (Page 689)".
WARNING
1)
safety-relevant monitoring. For additional information, see Section "Safe Brake Control
(SBC) (Page 689)".
can occur if 2 power transistor simultaneously become
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions