Safety engineering
Basic Safety − STO
Mode of operation
10
l
135
EDS700ACBA EN 5.1
10.6 Basic Safety − STO
E70ACMxxxxx4xAxETx − Basic Safety − STO
10.6.1 Mode of operation
With the integrated safety system, product key: A, the following safety function can be
used:
ƒ Safe Torque Off (STO)
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).
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
SU
PWM
µC
3x
3x
X...
i700FP005
Fig. 10−1 Operating principle of safety unit
SU Safety unit
X... Control terminals of the safety unit
mC Microcontroller
PWM Pulse Width Modulation
M Motor
Safety status
If the controller is switched off by the safety system, the "STO is not active" status in the
status word changes from 1: HIGH to 0: LOW (object 0x6041/0x6841, bit 15).
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