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Chapter 4 - Parameter Description [FU2]
57
Set the proportional gain for PID control. When P-
Gain is set at 100% and I-Gain at 0.0 second, it
means the PID controller output is 100% for 100%
error value.
Set the integral gain for PID control. This is the
time the PID controller takes to output 100% for
100% error value.
Set the differential gain for PID control.
This is the frequency at which the output
frequency is limited during PID control.
[P Control] This is to compensate the error of a
system proportionally. This is used to make the
controller response fast for an error. When P
control is used alone, the system is easily affected
by an external disturbance during steady state.
[I Control] This is to compensate the error of a
system integrally. This is used to compensate the
steady state error by accumulating them. Using
this control alone makes the system unstable.
[PI control] This control is stable in many
systems. If “D control” is added, it becomes the 3
rd
order system. In some systems this may lead to
system instability.
[D Control] Since the D control uses the variation
ratio of error, it has the merit of controlling the
error before the error is too large. The D control
requires a large control quantity at start, but has
the tendency of increasing the stability of the
system. This control does not affect the steady
state error directly, but increases the system gain
because it has an attenuation effect on the
system. As a result, the differential control
component has an effect on decreasing the
steady state error. Since the D control operates
on the error signal, it cannot be used alone.
Always use it with the P control or PI control.
FU2-70: Reference Frequency for Accel/Decel
This is the reference frequency for acceleration
and deceleration. If a decided Accel/Decel time
from a frequency to a target frequency is required,
set this value to ‘Delta freq’.
Setting Range
Select Display
Description
Max freq
0
The Accel/Decel time is the time that
takes to reach the maximum
frequency from 0 Hz.
Delta freq
1
The Accel/Decel time is the time that
takes to reach a target frequency from
a frequency (currently operating
frequency).
Related Functions: DRV-04 [Frequency Mode]
FU2-40 [Control Method]
I/O-01 ~ I/O-10 [Analog Signal Scaling]
Related Functions: DRV-01, DRV-02 [Accel/Decel Time]
FU2-71 [Accel/Decel Time Scale]
I/O-25 ~ I/O-38 [1
st
~ 7
th
Accel/Decel Time]