Siemens MICROMASTER 411 - Manual (Page 127)

Issue 03/01 10 Engineering Information
MICROMASTER 411 & COMBIMASTER 411 Operating Instructions
6SE6400-5CA00-0BP0 127
Figure 10-8 Response to 5 Hz step: T = 700 ms
The frequency step ∆ f = 5 Hz / 50 Hz = 10 %
The feedback step ∆ x = 0.64 V / 10 V = 6.4 %
P gain = (0.9)(T)( ∆ f) / (L)( ∆ x) = 9.84 = P2280
I time = 3L = 0.30 s = P2285
The PI controller should now be enabled (P2200 = 1).
Figure 10-9 Step Response in PI control with P2280 = 9.84 and P2285 = 0.30