Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 40)

n b5-01: PI Function Setting
Enables or disables the PI operation and selects the PI operation mode.
No. Parameter Name Setting Range Default
b5-01 PI Function Setting 0, 1, 3 0
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.
n b5-02: Proportional Gain Setting (P)
Sets the P gain applied to the PI input. Larger values will tend to reduce the error but may cause oscillations if set too high,
while lower values may allow too much offset between the setpoint and feedback.
No. Name Setting Range Default
b5-02 Proportional Gain Setting (P) 0.00 to 25.00 2.00
n b5-03: Integral Time Setting (I)
Sets the time constant used to calculate the integral of the PI input. The shorter the integral time set to b5-03, the faster the
offset will be eliminated. If the integral time is set too short, however, overshoot or oscillation may occur. To turn off the
integral time, set b5-03 to 0.00.
No. Name Setting Range Default
b5-03 Integral Time Setting (I) 0.0 to 360.0 s 0.5 s
n b5-04: Integral Limit Setting
Sets the maximum output possible from the integral block as a percentage of the maximum frequency (E1-04).
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.
n 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%
n 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%
n 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.
1.2 b: Application
40 YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual