Sdi (Extended Functions) - Siemens SINAMICS S120 Commissioning Manual

Commissioning
4.10 Safety Integrated commissioning
● Due to the less precise speed recognition, "Safe Speed Monitor without encoder" requires
a larger velocity hysteresis (p9547) and, where applicable, a filter time (p9545) compared
with the function with encoder.
4.10.4.11

SDI (extended functions)

The "Safe Direction" ("SDI") function allows the safe monitoring of the drive motion direction.
If this function is activated, the drive can only move in the enabled direction. You can check
whether SDI is active in the "Diagnostics (Page 286)" screen form. When active, at least one
of the LEDs is green:
● SDI positive active (r9722.12)
● SDI negative active (r9722.13)
Parameterizing SDI (with encoder)
After SDI has been selected via onboard terminals or PROFIsafe (see Section "Making basic
safety settings (Page 223)"), the delay time p9565 is started. During this time, you have the
option of ensuring that the drive is moving in the enabled direction. After this, the "Safe
Direction" function is active and the direction of motion is monitored.
If the drive now moves more than the configured tolerance (p9564) in the disabled direction,
message C01716 is output and the stop response defined in p9566 is initiated. To
acknowledge the messages, you must first deselect SDI, correct the fault cause and then
safely acknowledge the messages. Only then can you reselect SDI.
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The speed remains below the velocity limit p9546 throughout the entire monitoring
period. Therefore, the SSM feedback signal remains r9722.15 = 1. After the command
for pulse suppression, the motor speed drops. The internal STO is set when the speed
drops below the standstill detection level.
In this case, the SSM feedback signal remains HIGH; it is frozen. The drive cannot
accelerate again, due to the internal STO selection.
To restart the motor safely, STO must be selected manually and then deselected
again. After STO has been deselected, a 5 second time window is opened. If the pulse
enable takes place within this time window, the motor starts. If the pulse enable does
not take place within this 5 second time window, the internal STO becomes active
again.
If p9509.0 = 1, the SSM monitoring is terminated after the pulse suppression. The
feedback signal p9722.15 drops to 0. The SSM monitoring is only reactivated after a
new pulse enable. In this case, STO must not be selected and deselected to start the
drive.
Commissioning with Startdrive
Commissioning Manual, 11/2017, 6SL3097-4AA10-0BP1