Safely-Limited Speed - Siemens SINAMICS G120 Operating Instructions Manual

Functions
8.18 Fail-safe functions
8.18.5

Safely-Limited Speed

Data
Parameter range:
Warnings
Faults
Description
The purpose of the Safely-Limited Speed (SLS) function is to monitor the speed of the motor
to ensure that it does not exceed the upper SLS limit set by parameters P9691 and P9891.
Should the upper SLS limit be exceeded a braking process will be initiated which is
monitored using the safe braking ramp function. If a stationary state is detected, the Safe
Torque Off (STO) will be initiated to bring the motor to a safe standstill. If the braking
functions fails, which is detected as a fault, then the Latched Safe Torque Off (LSTO)
function is initiated and cannot be cleared without explicitly acknowledgment of the fault.
The SLS function can be intercepted by the following commands:
● Safe Torque Off (STO)
● OFF1 (only SLS Mode 2)
● OFF2
● OFF3 (only SLS Mode 2)
However, the reaction of the system to the standard OFF commands may produce
unpredictable results. If the standard OFF commands are to be used with the fail-safe
functions, the interaction of the commands on the system are automatically monitored in the
background by the fail-safe system (i.e. the commands, which are not fail-safe, cannot cause
the inverter to accelerate in an unsafe way as the LSTO function will be triggered
automatically).
8-114
P0003, P0010
P09761
P9603/P9803, Bit 00, Bit 01 or Bit 07 (PROFIsafe)
P9799/P9899/P3900
P9690/P9890
P9691/P9891
P9692/P9892
A1691, A1692, A1696, A1699
F1600, F1616
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S