Danfoss FC 300

7-32 Process PID Start Speed
Range: Function:
0 RPM
*
[0 - 6000 RPM] Enter the motor speed to be attained as a start signal for com-
mencement 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: Function:
0.01 N/
A
*
[0.00 - 10.00 N/A] 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: Function:
10000.0
0 s
*
[0.01 - 10000.00] Enter the PID integral time. The integrator provides an increas-
ing 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: Function:
0.00 s
*
[0.00 - 10.00 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.
7-36 Process PID Diff. Gain Limit
Range: Function:
5.0 N/
A
*
[1.0 - 50.0 N/A] 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 con-
stant differentiator gain where fast changes occur.
7-38 Process PID Feed Forward Factor
Range: Function:
0%
*
[0 - 500%] Enter the PID feed forward (FF) factor. The FF factor sends a
constant fraction of the reference signal to bypass the PID con-
trol, 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 changing the set point. Par.
7-38 is active when par. 1-00
Configuration Mode is set to [3]
Process.
FC 300 Programming Guide 2. How to Programme
MG.33.M2.02 - VLT
®
is a registered Danfoss trademark 125
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