Lenze 8615E - Manual (Page 79)

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4.6 Additional functions
For special applications, you can use a variety of additional
functions:
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Using this function, the integral action component (I-component) of
the PI controller can be reset to zero. You can activate this
additional function via one of the freely assignable digital inputs.
Fur further information about programming of the freely assignable
inputs see page 78.
This function is e.g. useful for applications where a drive comes to
standstill either after zero set-value and remains in standstill
without the controller being inhibited. By resetting the I-component,
a motor drifting is avoided. If the drive is braked mechanically with
zero set-value, a resetting of the I-component avoids the drive to
jerk after releasing the brake.
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The digital function feedback = set-value shows that the controller
deviation (difference between set-value and feedback) is within a
certain preset range. The thresholds are considered as a window
which you can determine under C240. The value to be entered
refers to f
dmax (C011).
Code Parameter Meaning Acceptance
C240 0.5%
0.0...100% Window "Feedback = set-value" ON-LINE
In open-loop control the signal "set-value reached" (Controller
enable/A=E) is transferred to the function "feedback = set-value".
You can assign the function to one of the freely assignable digital
outputs. Fur further information about programming of the freely
assignable outputs see page 86.
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The function feedback = 0 shows that there is no feedback or the
motor does not run. The range, where the function is active, is
fixed in the form of a window of
±
0.5% related to f
dmax
.
You can assign the function to one of the freely assignable digital
outputs and use it for example to reset the I-component of the PI
controller. Fur further information about programming of the freely
assignable outputs see page 86.
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The speed feedback is displayed under code C051. According to the
display of the set-value 1 (C046), you can select a relative or an
absolute display in Hertz. In open-loop control (without speed feed-
back) "0" is shown under C051, since the feedback input is not used.
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You can assign the input and output data of the PI controller to the
freely assignable monitor outputs, if necessary. For closed-loop
speed control with frequency pilot control, the controller output is
an approximate value for the motor torque.
•
Controller set-value (total set-value/total from main set-value
and set-value 2),
•
Controller feedback (signal via input X1/terminals 3,4 or X5/X8)
•
Controller output (variable of the PI controller)
For further information about programming of the monitor outputs
see page 89.