FC 300 Design Guide
How to Program
Function:
Select Off [0] to cease re gulation of an error when
the output frequency can no longer be adjusted.
Select On [1] to continue regulation of an
error even w hen the output frequency cannot
be increased or decreased .
7-32 Process PID Start Speed
Range:
0 - 6000 RPM
*
0RPM
Function:
Enter the motor speed to be attained as a s tart
signal for commencement of PID control. When the
power is switched on, the fre quency 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 Pro cess PID Proportional Gain
Range:
0.00 - 10.00 N/A
*
0.01 N/A
Function:
Enter the PID proportional gain. The pro portional
gain multiplies the error betwe en the set
point and the feedback signal.
7-34 Process PID Integral T im e
Range:
0.01 - 10000.00
*
10000.00 s
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 t he int egrator to reach
the same gain as the proportional gain.
7-35 Process PID Di ffe rentiation Time
Range:
0.00 - 1 0.00 s
*
0.00 s
Function:
Enter the PID differentiation time. The differen
tiator
doesnotreacttoaconstanterror,butprovides
a gain only when the error changes. The shorter
the PID d iffe rentiation tim e, the stronge
rthe
gain from the differentiator.
7-36 Process PID Differ entiation Gain Limit
Range:
1.0 - 50.0 N/A
*
5.0 N/A
Function:
Enter a limit for the diffe rentiator gain (DG). If
there is no limit, the DG will increa se 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.
7-38 Process PID Feed Forward Factor
Range:
0 - 500%
*
0%
Function:
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 h igh dynamics when
changing the set point. Par. 7-38 is ac tive when par.
1-00 Configuration Mode is set to [3] Proce ss.
7-39 On Reference Bandwidth
Range:
0 - 200%
*
5%
Function:
Enter the On Reference bandwidth. When the
PID Contr ol Error (the difference between the
reference and the feedb ack) is less than the
set value of this parameter the On Reference
status bit is high, i.e. =1.
*
default setting ()display text []value for use in communication via serial communication port
210
MG.33.B
6.22 - V LT is a registered Danfoss trademark
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