Lenze SO30 8400 protec - Manual (Page 21)

Safety option 20
Operating mode
Disconnecting paths
4
l
21 EDS84DPSO01 EN 2.1
4.1.2 Disconnecting paths
The transmission of the pulse width modulation is safely switched (off) by the safety unit.
After this, the power drivers do not generate a rotating field. The motor is safely switched
to torqueless operation (STO).
M
SO
PWM
µC
P C
3x
3x
Xxx
E84DPSO02
Fig. 4−1 Operating principle of safety unit
SO Safety option 10, 20, or 30
xxx Control terminals used in safety engineering systems or safety bus
C Control section
mC Microcontroller
PWM Pulse width modulation
P Power section
M Motor
4.1.3 Safety status
When the controller is disconnected from the safety unit, the "Safe torque off" (STO) status
is set (C00155 bit 10 = 1).
4.1.4 Fail−safe status
When internal errors of the safety unit are detected, the motor is safely switched to
torqueless operation (fail−safe status).