Siemens MICROMASTER 411 - Manual (Page 128)

10 Engineering Information Issue 03/01
MICROMASTER 411 & COMBIMASTER 411 Operating Instructions
128 6SE6400-5CA00-0BP0
10.2.4 PI Output Limits
The PI controller generates the frequency at which the inverter runs. This is
generated as a % which is normalized into Hz via P2000. The user can limit the
output range of the controller using parameters P2291 and P2292. While the
inverter will only operate within the frequency range defined by F
min
(P1080) and
F
max
(P1082), the PI output limits can be used to further limit the output frequency.
Once one of the limits has been reached a bit is set (P0053.A or P0053.B) which
can be connected to the digital output via P0731, or used for internal control
purposes using BiCo.
NOTE:
If F
max
(P1082) is greater than the value in P2000, then either P2000 or P2291
should be adjusted to allow F
max
to be reached.
Setting P2292 to a negative value allows bipolar operation of the PI controller.
10.2.5 Further features
Further features, such as a PI setpoint trim can be accessed in user access level 3
(P0003 = 3). These features are described in the Parameter List.
PID
MOP
ADC
PID
SUM
PID
PID
FF
USS
BOP link
USS
COM link
CB
COM link
ADC2
P2254
P2253
PID
RFG
PID
PT1
0
1
− ∆
PID
P2200
P2253
PID
PT1
PID
SCL
Output
PID
Motor
control
Figure 10-10 PI Basic Block Diagram