YASKAWA Z1000 - Page 163

No. Name Setting Range Default
b5-04 Integral Limit Setting 0.0 to 100.0% 100.0%
Note: On some applications, especially those with rapidly varying loads, the output of the PI function may show a fair amount of oscillation.
Program b5-04 to apply a limit to the integral output and suppress this oscillation.
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b5-06: PI Output Limit
Sets the maximum output possible from the entire PI controller as a percentage of the maximum frequency (E1-04).
No. Name Setting Range Default
b5-06 PI Output Limit 0.0 to 100.0% 100.0%
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b5-07: PI Offset Adjustment
Sets the offset added to the PI controller output as a percentage of the maximum frequency (E1-04).
No. Name Setting Range Default
b5-07 PI Offset Adjustment -100.0 to 100.0% 0.0%
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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.
No. Name Setting Range Default
b5-08 PI Primary Delay Time Constant 0.00 to 10.00 s 0.00 s
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.
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b5-09: PI Output Level Selection
Reverses the sign of the PI controller output signal. Normally a positive PI input (feedback smaller than setpoint) leads to
positive PI output.
No. Parameter Name Setting Range Default
b5-09 PI Output Level Selection 0, 1 0
Setting 0: Normal Output
A positive PI input causes an increase in the PI output (direct acting).
Setting 1: Reverse Output
A positive PI input causes a decrease in the PI output (reverse acting).
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b5-10: PI Output Gain Setting
Applies a gain to the PI output and can be helpful when the PI function is used to trim the frequency reference (b5-01 = 3 or
4).
No. Name Setting Range Default
b5-10 PI Output Gain Setting 0.00 to 25.00 1.00
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b5-11: PI Output Reverse Selection
Determines whether a negative PI output reverses the direction of drive operation. This parameter has no effect when the PI
function trims the frequency reference (b5-01 = 3) and the PI output will not be limited (same as b5-11 = 1).
No. Parameter Name Setting Range Default
b5-11 PI Output Reverse Selection 0, 1 0
Setting 0: Reverse Disabled
Negative PI output will be limited to 0 and the drive output will be stopped.
4.13 Advanced Drive Setup Adjustments
YASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual
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Start-Up Programming & Operation