Safety option 20
Operating mode
Disconnecting paths
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
m
C
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).
