YASKAWA T1000V - Page 125

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5.2 b: Application

YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 125

Parameter Details

■ b5-05: Derivative Time (D)

Sets the time the drive predicts the PID input/PID feedback signal based on the derivative of the PID input/PID feedback.

Longer time settings will improve the response but can cause vibrations. Shorter settings will reduce the overshoot but

also reduce the controller responsiveness. D control is disabled by setting b5-05 to zero seconds.

■

b5-06: PID Output Limit

Sets the maximum output possible from the entire PID controller. Set as a percentage of the maximum frequency (E1-

04).

■

b5-07: PID Offset Adjustment

Sets the offset added to the PID controller output. Set as a percentage of the maximum frequency.

■

b5-08: PID Primary Delay Time Constant

Sets the time constant for the filter applied to the output of the PID controller. Normally, change is not required.

Note: Effective in preventing oscillation when there is a fair amount of oscillation or when rigidity is low. Set to a value larger than the

cycle of the resonant frequency. Increasing this time constant reduces the responsiveness of the drive.

■ b5-09: PID Output Level Selection

Normally, the output of the PID function increase whenever the PID input is negative (feedback below setpoint). Using

b5-09 the PID controller can be set up for applications that require opposite operation.

Setting 0: Normal Output

A negative PID input causes an increase in the PID output (direct acting).

Setting 1: Reverse Output

A negative PID input causes a decrease in the PID output (reverse acting).

■

b5-10: PID Output Gain Setting

Applies a gain to the PID output and can be helpful when the PID function is used to trim the frequency reference (b5-01

= 3 or 4). Increasing b5-10 causes the PID function to have a greater regulating effect on the frequency reference.