Danfoss FC 300 Design Manual page 210

FC 300 Design Guide
Function:
Select Off [0] to cease regulation of an error when
the output frequency can no longer be adjusted.
Select On [1] to continue regulation of an
error even when the output frequency cannot
be increased or decreased.
7-32 Process PID Start Speed
Range:
0 - 6000 RPM
Function:
Enter the motor speed to be attained as a start
signal for commencement of PID control. When the
power is switched on, the frequency converter will
commence ramping and then operate under speed
open loop control. Thereafter, when the Process
PID start speed is reached, the frequency converter
will change over to Process PID control.
7-33 Process PID Proportional Gain
Range:
0.00 - 10.00 N/A
Function:
Enter the PID proportional gain. The proportional
gain multiplies the error between the set
point and the feedback signal.
7-34 Process PID Integral Time
Range:
0.01 - 10000.00
Function:
Enter the PID integral time. The integrator provides
an increasing gain at a constant error between the
set point and the feedback signal. The integral
time is the time needed by the integrator to reach
the same gain as the proportional gain.
7-35 Process PID Differentiation Time
Range:
0.00 - 10.00 s
Function:
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.
default setting ( ) display text
*
210
How to Program
Enter a limit for the differentiator gain (DG). If
there is no limit, the DG will increase when there
are fast changes. Limit the DG to obtain a pure
differentiator gain at slow changes and a constant
*
differentiator gain where fast changes occur.
0 RPM
Enter the PID feed forward (FF) factor. The FF 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 will thus affect the
motor speed. When the FF factor is activated it
*
provides less overshoot, and high dynamics when
0.01 N/A
changing the set point. Par. 7-38 is active when par.
1-00 Configuration Mode is set to [3] Process.
* Enter the On Reference bandwidth. When the
10000.00 s
PID Control Error (the difference between the
reference and the feedback) is less than the
set value of this parameter the On Reference
status bit is high, i.e. =1.
*
0.00 s
[ ] value for use in communication via serial communication port
MG.33.B6.22 - VLT is a registered Danfoss trademark
7-36 Process PID Differentiation Gain Limit
Range:
1.0 - 50.0 N/A
Function:
7-38 Process PID Feed Forward Factor
Range:
0 - 500%
Function:
7-39 On Reference Bandwidth
Range:
0 - 200%
Function:
*
5.0 N/A
*
0%
*
5%