Siemens SINAMICS G120 Operating Instructions Manual page 249

Example
PID controller enable and PID setpoint input via PID fixed frequencies and PID actual value via the
analog input
Permanent PID enable
Setpoint input via PID-FF
Actual value input via analog input AI
Setpoint input via PID
The supplementary (additional) setpoint is added to the main setpoint (PID-SUM) and the
sum is fed to the setpoint-actual value summation point through the PID ramp-function
generator (PID-RFG). The source of the supplementary setpoint (BICO parameter P2254),
the ramp-up/ramp-down times of the PID ramp-function generator (P2257, P2258) as well as
the filter time (P2261) can be adapted to the particular application by appropriately
parameterizing the corresponding parameters.
Similar to the PID setpoint branch, the actual value branch of the technological controller has
a filter (PID-PT1) which can be set using parameter P2265. In addition to the smoothing, the
actual value can be modified using a scaling unit (PID-SCL).
The technological controller can be parameterized as either P, I, PI or PID controller using
parameters P2280, P2285 or P2274.
Figure 8-36
For specific applications, the PID output quantity can be limited to defined values. This can
be achieved using the fixed limits - P2291 and P2292. In order to prevent the PID controller
output exercising large steps at power-on, these PID output limits are ramped-up with ramp
time P2293 from 0 to the corresponding value P2291 (upper limit for the PID output) and
P2292 (lower limit for the PID output). As soon as these limits have been reached, the
dynamic response of the PID controller is no longer limited by this ramp-up/ramp-down time
(P2293).
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
PID controller
P2200 = 1.0
P2253 = 2224
P2264 = 755
P2251 = 0
Functions
8.12 PID Controller
8-53