Lenze i700 Manual User Manual download pdf (Page 132)

Safety engineering

Operating mode

Introduction

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132

EDS700ACBA EN 4.0

10.5 Operating mode

10.5.1 Introduction

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).

PWM

µC

X...

E70...005

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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Lenze i700 Manual User Manual Page 132