D3-DA 3xx/x
Safety functions
Project engineering manual V1.07
70
© KEBA
8
Safety functions
Drive controller malfunctions must be detected by the superimposed moni-
toring of the movement or by other measures in the application.The detec-
tion and the reaction are the responsibility of the user. The D3-DA 3xx/x pro-
vides the safety functions STO and SBC that the user can use as a reaction
to drive controller malfunctions in the application.
This chapter describes the following safety functions:
●
STO (Safe Torque OFF)
●
SBC (Safe Break Control)
●
Diagnoses via cross circuit test
The connection of this safety functions are done via terminal X26A. The de-
sired behaviour of the safety functions can be configured via DIP switch (S-
ADR).
Both inputs of a safety function must be "active", to switch on the corre-
sponding output. Switching on can be done with a time offset from 1 ms up
to 200 ms because of internal diagnosis.
8.1
STO (Safe Torque OFF)
The axis module supports the safety function ”STO” (safe torque off) in ac-
cordance with EN 61800-5-2, EN ISO 13849-1 „PL e“ category 4 and EN
61508 / EN 62061 „SIL 3“. For the safety function STO the supply to the
drive is interrupted safe (no galvanic isolation). The drive must not create
torque and therefore dangerous movements. The stand still position is not
monitored. The function "STO" corresponds to the stop categorie 0 accord-
ing to EN 60204-1.
You will find the safety related characteristics in chapter "Technical Data".
The STO shutdown takes place within 2,5 ms.
The safety-related parts must be designed such that:
●
A single failure in any of these parts does not result in the loss of the
safety function.
●
The single failure is detected on or before the next demand upon the
safety function.
For the function STO the axis module is equipped with additional logic cir-
cuits. The logic interrupts the supply voltage for the pulse amplifier for the
operation of the power stage. By means of two inputs the motor is prevented
from generating torque using a two-channel process.
