Safe Direction (Sdi) - Siemens Sinamics S120 Function Manual

3.2.9

Safe Direction (SDI)

Definition according to EN 61800-5-2:
"The SDI function prevents the motor shaft mov-
ing in the wrong direction."
Ex amples 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
rotation.
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 monitors the actual direction of
rotation.
The SDI setpoint limit can be transmit-
ted to the higher-level motion control-
ler (e.g. SIMOTION) to enable
limitation of the velocity setpoint there.
In addition, you can configure the
setpoint limit provided by SDI as max-
imum speed in the ramp-function
generator. In this case, SDI limits the
speed setpoint to the permissible di-
rection.
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
Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Overview of Safety Integrated functions
3.2 Safety Integrated Extended Functions
Po ssible solution
Select SDI in the converter using a fail-
•
safe input or PROFIsafe .
Enable the locking mechanism of the
•
protective 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
•
rotation that is not permitted.
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