Siemens MICROMASTER 420 - PI Output Limits; Further Features

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MICROMASTER 420 Reference Manual
18 Issue A1
2.8.7 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.
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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.
2.8.8 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.