2-146 Process PI Loop
NOTE: In the PowerFlex 70, once the drive has reached the
programmable positive and negative PI limits, the integrator stops
integrating and no further “windup” is possible.
3. [PI Status] parameter is a set of bits that indicate the status of the
process PI controller
• Enabled – The loop is active and controlling the drive output.
• Hold – A signal has been issued and the integrator is being held at its
current value.
• Reset – A signal has been issued and the integrator is being held at
zero.
• In Limit – The loop output is being clamped at the value set in [PI
Upper/Lower Limit].
PI Reference and Feedback
The selection of the source for the reference signal is entered in the PI
Reference Select parameter. The selection of the source for the feedback
signal is selected in the PI Feedback Select parameter. The reference and
feedback have the same limit of possible options.
PowerFlex 70 options include DPI adapter ports, MOP, preset speeds,
analog inputs and PI setpoint parameter. In the PowerFlex 700, options are
expanded to also include additional analog inputs, pulse input, and encoder
input.
The value used for reference is displayed in PI Reference as a read only
parameter. The value used for feedback is displayed in PI Feedback as a
read only parameter. These displays are active independent of PI Enabled.
Full scale is displayed as ±100.00.
Refer to Analog Input Configuration
on page 2-9.
PI Reference Scaling
The PI reference can be scaled by using [PI Reference Hi] and [PI
Reference Lo]. [PI Refence Hi] determines the high value, in percent, for
the PI reference. [PI Reference Lo] determines the low value, in percent,
for the PI reference.
The PI feedback can be scaled by using [PI Feedback Hi] and [PI Feedback
Lo]. [PI Feedback Hi] determines the high value, in percent, for the PI
feedback. [PI Feedback Lo] determines the low value, in percent, for the PI
feedback.
Vector
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