Selecting and deselecting SDI
As soon as the converter identifies that SDIhas been selected via a failsafe input or via
PROFIsafe safe communication, the following happens:
● You can also set a delay time, within which you can ensure that the converter moves in the
enabled (safe) direction.
● You can also set a tolerance, within which the converter tolerates movement in the direction
that has not been enabled (unsafe). You can avoid the triggering of faults during braking
(overshoot) as well as in controlled standstill.
● After the delay time has expired, the converter monitors the direction of rotation of the motor.
● If the drive now moves more than the configured tolerance in the blocked direction, a
message is output and the defined stop response is initiated.
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Figure 4-20 Time response of the safety function SDI (Safe Direction)
Note
SDI without selection
As an alternative to controlling via terminals and/or PROFIsafe, there is also the option of
parameterizing SDI without selection. In this case, SDI will be permanently active after
POWER ON. You can find details about this in section "Safe Direction without selection
(Page 158)".
Safety functions integrated in the drive
4.12 SDI
Safety Integrated (with SINAMICS S120)
154 Commissioning Manual, 02/2020, A5E46305916B AB
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