Safety engineering
Operating mode
Introduction
8
106
EDS84DG752 EN 5.0
8.4 Operating mode
8.4.1 Introduction
Due to safety option 10, the following safety functions can be used:
ƒ Safe torque off (STO),
formerly: safe standstill
If requested, the safe disconnection of the drive is achieved through:
ƒ Directly connected active sensors
ƒ Passive sensors connected to a safety switching device
The safety functions are suitable for applications according to IEC 61508 to SIL 3 and
achieve a performance level (PL) e and the control category 4 according to EN ISO 13849-1.
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).
8.4.2 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 s witched
to torqueless operation (STO).
E84DPSO02
Fig. 8-1 Operating principle of safety unit
SO Safety option 10
xxx Control terminals of the safety system or safety bus
C Control section
C Microcontroller
PWM Pulse width modulation
PPowersection
M Motor
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