Siemens MICROMASTER 420 Reference Manual page 25

Figure 2-8
The frequency step ∆ = 5 Hz / 50 Hz = 10%
The feedback step ∆ = 0.64 V / 10 V = 6.4%
gain
time
The PI controller should now be enabled (P2200 = 1).
Figure 2-9
MICROMASTER 420 Reference Manual
Issue A1
Response to 5 Hz step: T = 700 ms
(0.9)(T)(∆f) / (L)(∆x) = 9.84
3L = 0.30 s =
Step Response in PI control with P2280 = 9.84 and P2285 = 0.30
=
17