Sdi - Siemens SINUMERIK MC Commissioning Manual

4.12

SDI

Definition according to EN 61800-5-2:
"The SDI function prevents the motor shaft mov‐
ing in the wrong direction."
Examples of how the function can be used
Example
A protective door must only be opened if a drive
moves in the safe direction (away from the operator).
When replacing the pressure cylinders of the plates,
the drive must only move in the safe direction of ro‐
tation.
Once the protection against jamming has been trig‐
gered, a roller shutter gate must only be able to start
moving in one direction.
At an operational limit switch, the trolley of a crane
must only be able to start in the opposite direction.
How does SDI function in detail?
SDI (Safe Direction) monitors the actual
direction of rotation.
The SDI setpoint limit can be transmitted
to the F-PLC to enable limitation of the
velocity setpoint.
In addition, you can configure the set‐
point limit provided by SDI as maximum
speed in the ramp-function generator. In
this case, SDI limits the speed setpoint to
the permissible direction.
You can select to block either the positive or the negative direction of rotation via 2 fail-safe
signals (F-DIs or PROFIsafe).
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
Safety functions integrated in the drive
Select SDI
Possible solution
● Select SDI in the converter using a fail-safe
input or PROFIsafe .
● Enable the locking mechanism of the protec‐
tive doors via the PROFIsafe status bit of the
converter.
● Select SDI in the converter using a fail-safe
input or PROFIsafe .
● In the converter, inhibit the direction of rota‐
tion that is not permitted.
4.12 SDI
SDI
153