Danfoss VLT AutomationDrive FC 301 Programming Manual page 181

Parameter Descriptions
7-22 Process CL Feedback 2 Resource
Option: Function:
[4] Frequency
input 33
[7] Analog Input
X30/11
[8] Analog Input
X30/12
[15] Analog Input
X48/2
[16] Analog Input
X49/1
[17] Analog Input
X49/3
[18] Analog Input
X49/5
3.8.6 7-3* Process PID Ctrl.
7-30 Process PID Normal/ Inverse Control
Option: Function:
Normal and inverse controls are
implemented by introducing a
difference between the reference
signal and the feedback signal.
[0] Normal Set process control to increase the
*
output frequency.
[1] Inverse Set process control to decrease the
output frequency.
7-31 Process PID Anti Windup
Option: Function:
[0] Off Continue regulation of an error
even when the output frequency
cannot be increased or decreased.
[1] On Cease regulation of an error when
*
the output frequency can no longer
be adjusted.
7-32 Process PID Start Speed
Range: Function:
0 RPM [0 - 6000 Enter the motor speed to be
*
RPM] attained as a start signal for
commencement of PID control.
When the power is switched on,
the frequency converter starts to
ramp and then operates under
speed open-loop control. When the
process PID start speed is reached,
the frequency converter changes to
process PID control.
M0013101
Programming Guide
7-33 Process PID Proportional Gain
Range:
0.10
*
7-34 Process PID Integral Time
Range:
10000 s
*
7-35 Process PID Differentiation Time
Range:
0 s
*
7-36 Process PID Diff. Gain Limit
Range:
5
*
7-38 Process PID Feed Forward Factor
Range:
0 %
*
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Function:
[0 - 10 ] Enter the PID proportional gain. The
proportional gain multiplies the
error between the setpoint and the
feedback signal.
Function:
[0.01 - 10000 Enter the PID integral time. The
s] integrator provides an increasing
gain at a constant error between
the setpoint and the feedback
signal. The integral time is the time
needed by the integrator to reach
the same gain as the proportional
gain.
Function:
[0 - 10 s] Enter the PID differentiation time.
The differentiator does not react to
a constant error, but provides a
gain only when the error changes.
The shorter the PID differentiation
time, the stronger the gain from
the differentiator.
Function:
[1 - 50 ] Enter a limit for the differentiator
gain. If there is no limit, the differ-
entiator gain increases when there
are fast changes. To obtain a pure
differentiator gain at slow changes
and a constant differentiator gain
where fast changes occur, limit the
differentiator gain.
Function:
[0 - 200 %] Enter the PID feed forward factor.
The factor sends a constant fraction
of the reference signal to bypass
the PID control, so the PID control
only affects the remaining fraction
of the control signal. Any change to
this parameter affects the motor
speed. When the feed forward
factor is activated, it provides less
overshoot and high dynamics when
changing the setpoint.
Parameter 7-38 Process PID Feed
Forward Factor is active when
3 3
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