Chapter 4 - Parameter Description [FU2]

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 3rd 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.

Related Functions: DRV-04 [Frequency Mode]

FU2-40 [Control Method]

I/O-01 ~ I/O-10 [Analog Signal Scaling]

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

Description

 

Select

Display

 

 

 

 

 

 

The Accel/Decel time is the time that

 

Max freq

0

takes to reach the maximum

 

 

 

frequency from 0 Hz.

 

 

 

The Accel/Decel time is the time that

 

Delta freq

1

takes to reach a target frequency from

 

a frequency (currently operating

 

 

 

 

 

 

frequency).

 

 

 

 

Related Functions: DRV-01, DRV-02 [Accel/Decel Time]

 

 

 

FU2-71 [Accel/Decel Time Scale]

 

 

 

I/O-25 ~ I/O-38 [1st ~ 7th Accel/Decel Time]

 

 

 

 

 

 

57

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Cleveland Range inverter manual FU2-70 Reference Frequency for Accel/Decel, Delta freq
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inverter specifications

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