Lenze i950

19.1 Safe Torque O (STO)
The motor cannot generate torque and movements of the drive.
DANGER!
Automac restart if the request of the safety funcon is deacvated.
Possible consequences: Death or severe injuries
▶
You must provide external measures according to EN ISO 13849−1 which ensure that the
driv
e only restarts aer a conrmaon.
DANGER!
The power supply is not safely disconnected.
Dea
th or serious injury due to electrical voltage.
▶
Turn o the power supply.
Precondions
Moon caused by external forces must be prevented by addional measures such as mechani-
c
al braking.
The restart must be set. See chapter .
Details
Safe disconnecon of the drive
1.A safety sensor requests the safety funcon.
2.The pulse width modulaon is safely switched o by the safety unit.
The inverter switches to the STO acve device status (0x6041, Bit15 = 0).
The power drivers do not generate a rotang eld anymore.
The motor is safely switched to torqueless operaon (STO).
The
funconal principle depicted applies to Basic Safety (STO) and Extended
Safety. The terminals shown apply to Basic Safety.
PWM
µC
3x
3x
X1
SU
M
SIA SIB
GS
Fig. 70: Funconal principle of safety technology for Extended Safety and Basic Safety (STO)
X1 Control terminals of the safety unit
SU
Basic Safety (STO) or Extended
Safety
µC Microcontroller
PWM Pulse width modulaon
M Motor
Funconal descripon
Safety
funcons
Safe Torque O (STO)
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