Siemens SINAMICS S120 - Page 682

Safety Integrated Basic Functions
10.4 Safe Torque Off (STO)
Drive functions
682 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
WARNING
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
safety-relevant monitoring. For additional information, see Section "Safe Brake Control
(SBC) (Page 689)".
WARNING
Unplanned motor motion
Undesirable motor motion
1)
can occur if 2 power transistor simultaneously become
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
safety-relevant monitoring. For additional information, see Section "Safe Brake Control
(SBC) (Page 689)".
1)
The maximum movement can involve:
● 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