Siemens SINAMICS G220 - Safe Speed Monitor (SSM)

With SLS active, the converter sends the required setpoint limit r9733 in the S_V_LIMIT_B
signal of telegram 700.
The converter calculates r9733 as follows:
• r9733[0] = p9531[x]·p9533 (converted from the load to the motor side)
• r9733[1] = -p9531[x]·p9533 (converted from the load to the motor side)
[x] = selected SLS limit value
p9533 is the weighting factor to determine the setpoint limit from the selected actual speed
limit in percent.
Conversion factor from the motor to the load side:
• Motor type = rotary and axis type = linear: p9522/(p9521·p9520)
• Otherwise: p9522/p9521
14.12.5.4 Safe Speed Monitor (SSM)
Overview
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Y
W
W
Figure14-232 Overview SSM
Safe Speed Monitor (SSM) safely detects when the speed falls below a speed limit in
both directions of motion. SSM is a pure signaling function. The converter provides a safety-
related signal for further processing.
If the speed of the motor exceeds the SSM limit value, no stop response is initiated, contrary
to other Safety Integrated Functions.
Functions
14.12Safety Integrated
SINAMICS G220 converter
Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB 673