5.2 b: Application
148 YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual
■ b5-01: PI Function Setting
Enables or disables the PI operation and selects the PI operation mode.
Setting 0: PI disabled
Setting 1: Output frequency = PI output 1
The PI controller is enabled and the PI output builds the frequency reference.
Setting 3: Output frequency = frequency reference + PI output 1
The PI controller is enabled and the PI output is added to the frequency reference.
■
b5-02: Proportional Gain Setting (P)
Sets the P gain that is applied to the PI input. A large value will tend to reduce the error, but may cause instability
(oscillations) if set too high. A low value may allow too much offset between the setpoint and feedback.
■
b5-03: Integral Time Setting (I)
Sets the time constant that is used to calculate the integral of the PI input. The smaller the integral time set to b5-03, the
faster the offset will be eliminated. If set too short, it can cause overshoot or oscillation. To turn off the integral time, set
b5-03 = 0.00.
■
b5-04: Integral Limit Setting
Sets the maximum output possible from the integral block. Set as a percentage of the maximum frequency (E1-04).
Note: On some applications, especially those with rapidly varying loads, the output of the PI function may show a fair amount of
oscillation. To suppress this oscillation, a limit can be applied to the integral output by programming b5-04.
■ b5-06: PI Output Limit
Sets the maximum output possible from the entire PI controller. Set as a percentage of the maximum frequency (E1-04).
■
b5-07: PI Offset Adjustment
Sets the offset added to the PI controller output. Set as a percentage of the maximum frequency.
■
b5-08: PI Primary Delay Time Constant
Sets the time constant for the filter applied to the output of the PI controller. Normally, change is not required.
Note: Useful 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 may reduce the responsiveness of the drive.
No. Parameter Name Setting Range Default
b5-01 PI Function Setting 0, 1, 3 0
No. Name Setting Range Default
b5-02 Proportional Gain Setting (P) 0.00 to 25.00 1.00
No. Name Setting Range Default
b5-03 Integral Time Setting (I) 0.0 to 360.0 s 1.0 s
No. Name Setting Range Default
b5-04 Integral Limit Setting 0.0 to 100.0% 100.0%
No. Name Setting Range Default
b5-06 PI Output Limit 0.0 to 100.0% 100.0%
No. Name Setting Range Default
b5-07 PI Offset Adjustment -100.0 to 100.0% 0.0%
No. Name Setting Range Default
b5-08 PI Primary Delay Time Constant 0.00 to 10.00 s 0.00 s
SIEP_C710616_35.book 148 ページ ２０１５年１１月３０日 月曜日 午後２時２分
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