Safely-Limited Speed Without Encoder - Siemens SINAMICS G130 Manual

Safety Integrated Extended Functions
6.7 Safely-Limited Speed (SLS)
As opposed to SLS limit parameters, this parameter specifies limits on the motor side
instead of limits on the load side.
● r9733[0] = p9531[x] * p9533; x = selected SLS stage
● r9733[1] = - p9531[x] * p9533; x = selected SLS stage
Responses
Speed limit value exceeded:
● Configured subsequent stop STOP A / B / C / D by means of p9363/p9563
● Safety message C01714/C30714
System errors:
● STOP F
● Safety messages C01711/C30711
6.7.4

Safely-Limited Speed without encoder

Functional features of "Safely Limited Speed" without encoder
Note
The use of the safety function, "Safely-Limited Speed" (SLS) without encoder is only
possible for asynchronous motors.
If you are using a speed setpoint limit, after activating SLS the motor will immediately be
braked with the OFF3-ramp from the current speed under the selected SLS [1 to 4] speed
limit; otherwise the motor will continue to run and violate the Safe Brake Ramp. Monitoring is
activated after delay time p9582/p9382 (SI Motion brake ramp delay time Control Unit/Motor
Module) has elapsed. Monitoring ensures that the motor does not exceed the safe brake
ramp (SBR) during braking. If the brake ramp is violated, messages C01706 and C30706 are
output and the drive is stopped with STOP A.
The new SLS speed limit is accepted as the new limit speed if either the brake ramp has
reached the new SLS speed limit or the actual speed of the drive was below the new SLS
speed limit for at least as long as p9582 (SI Motion brake ramp delay time Control Unit).
The SLS function then monitors whether the new actual speed remains below the selected
SLS speed limit. The parameter-assigned stop response is triggered if the limit speed is
exceeded (p9563[x]).
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Safety Integrated
Function Manual, 05/2010, A5E03264275A