Lenze i55 Series User Manual

13 Safety funcons
13.1 Safe torque o (STO)
With this safety funcon, the drive can be switch o safely immediately.
DANGER!
Automac restart if the request of the safety funcon is deacvated.
Possible consequences: Death or severe injuries
▶
You must provide external measures according to EN ISO 13849−1 which ensure that the
drive only restarts aer a conrmaon.
Precondions
Inverter with I5MASA000 safety module
Details
Safe disconnecon of the drive
1.A safety sensor requests the safety funcon.
2.The transmission of the pulse width modulaon is safely switched o by the safety unit.
3.The power drivers do not generate a rotang eld anymore.
4.The "STO is not acve" status in the status word changes from 1: HIGH to 0: LOW (object
0x6041, bit 15).
The motor is safely switched to torqueless operaon (STO).
Fig. 8: Operang principle of safety unit
X1 Control terminals of the safety unit
PWM Pulse width modulaon
M Motor
µC Microcontroller
Truth table
Safe input / channel Inverter
SIA SIB Device status Approval
0 0
STO acve
0
0 1 0
1 0 0
1 1 Drive enabled 1
If SIA and SIB are LOW at the same me, the internal status signal "Both STO
channels not acve [155]" in the inverter is set to TRUE. This status signal can be
used to trigger a "non-safe output" (e.g. to the relay).
If the GS connecon is interrupted or in case of a short circuit/short circuit of GS
to SIA/SIB, STO is acve.
Safety funcons
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Lenze i55 Series Specifications

General

Brand	Lenze
Model	i55 Series
Category	Inverter
Language	English