Siemens SINAMICS G120 Function Manual page 26

Description
2.6 Safely Limited Speed, SLS
Scenario 2: The load speed is higher than the monitoring threshold.
● After SLS has been selected, the inverter brakes the motor immediately with the OFF3
● After a definable "SS1 delay" has elapsed, the inverter uses the SBR (Safe Brake Ramp)
● The inverter switches from SBR monitoring to "SLS monitoring" as soon as one of the
● When you deselect SLS, the motor continues following its speed setpoint.
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ramp-down time.
function to determine whether the load speed has decreased. The delay is the same as
that for the SS1 function.
following two conditions is fulfilled:
– The SBR ramp has reached the "SLS monitoring" value.
– The load speed has decreased to the "SLS monitoring" value and the "SS1 delay" has
elapsed. This case is illustrated in the diagram below.
Figure 2-7 Selecting and deselecting the SLS safety function at high speeds
Safety Integrated Function Manual, SINAMICS G120
Function Manual, 07/2010, FW 4.3.2, A5E03052391B AA