Lenze 8400 User Manual download pdf (Page 276)

Safety engineering

Operating mode



276

EDS84ASC552 EN 9.1

10.5 Operating mode

With the integrated safety system, product key: ...B..., 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 c onnected 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 E N 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 i s 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

X80

E84ABSB005

Fig. 10-1 Operating principle of safety unit

SU Safety unit

X80 Control terminals of safety unit (pluggable terminal strip)

C Control section

C Microcontroller

PWM Pulse width modulation

PPowersection

M Motor

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Lenze 8400 User Manual Page 276