Safety engineering
Operating mode
10
l
264
EDS84ASC552 EN 8.1
10.4 Operating mode
} Danger!
If the request for the safety function is cancelled, the drive will restart
automatically.
You must provide external measures which ensure that the drive only restarts
after a confirmation (EN 60204).
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).
X80
E84ABSB005
Fig. 10−1 Operating principle of safety unit
SU Safety unit
X80 Control terminals of safety unit (pluggable terminal strip)
C Control section
C Microcontroller
PWM Pulse width modulation
P Power section
M Motor
Safety status
When the controller is disconnected from the safety unit, the "safe torque off" (STO) status
is set (C00137 bit 10 = 1).
Fail−safe status
When internal errors of the safety unit are detected, the motor is safely switched to
torqueless operation (fail−safe status).
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