Yaskawa Z1000 AC Drive HVAC - Manual (Page 160)

Normal drive and PI operation return after the PI feedback drops below the PI Snooze Deactivation Level (b5-24). Snooze
activates when both b5-22 and b5-27 conditions are met. There is no time delay for deactivation.
Sets as a percentage of maximum frequency.
No. Parameter Name Setting Range Default
b5-27 PI Snooze Feedback Level 0 to 100% 60%
n b5-28: PI Feedback Function Selection
When b5-28 is set to 1, the square root of the PI feedback is compared to the PI Setpoint to determine appropriate drive output
to properly regulate the system.
This is helpful in cases where the measured feedback is pressure, but the PI loop needs to regulate flow.
No. Parameter Name Setting Range Default
b5-28 PI Feedback Function Selection 0, 1 0
0: Disabled
1: Square Root
n b5-29: PI Square Root Gain
A multiplier applied to the square root of the feedback. If the PI Function is regulating the flow of a closed loop system by
using a pressure feedback, it may be convenient to view the square root of the PI output using monitor U1-37.
No. Parameter Name Setting Range Default
b5-29 PI Square Root Gain 0.00 to 2.00 0.00
n b5-30: PI Feedback Offset
Sets PI feedback Offset as a percentage of maximum frequency.
No. Parameter Name Setting Range Default
b5-30 PI Feedback Offset 0.00 to 100.00% 0.00%
n b5-34: PI Output Lower Limit
Sets the minimum possible PI controller output as a percentage of the maximum output frequency (E1-04). The lower limit is
disabled when set to 0.00%
No. Name Setting Range Default
b5-34 PI Output Lower Limit -100.0 to 100.0% 0.0%
n b5-35: PI Input Limit
Sets the maximum allowed PI input as a percentage of the maximum output frequency (E1-04). Parameter b5-35 acts as a
bipolar limit.
No. Name Setting Range Default
b5-35 PI Input Limit 0 to 1000.0% 1000.0%
n b5-36: PI Feedback High Detection Level
Sets the feedback level used for PI feedback high detection. The PI feedback must exceed this level for longer than the time
set to b5-37 before feedback loss is detected.
No. Name Setting Range Default
b5-36 PI Feedback High Detection Level 0 to 100% 100%
n b5-37: PI Feedback High Detection Time
Sets the time that the PI feedback must exceed the value set to b5-36 before feedback loss is detected.
4.13 Advanced Drive Setup Adjustments
160 YASKAWA ELECTRIC TOEP YAIZ1U 03A YASKAWA AC Drive – Z1000 User Manual