Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 41)

n 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).
n 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
n 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.
Setting 1: Reverse Enabled
Negative PI output will cause the drive to run in the opposite direction.
n PI Feedback Loss Detection
The PI feedback loss detection function detects broken sensors or broken sensor wiring. It should be used when PI control is
enabled to prevent critical machine conditions (e.g., acceleration to max. frequency) caused by a feedback loss.
Feedback loss can be detected in two ways:
• Feedback Low Detection
Detected when the feedback falls below a certain level for longer than the specified time. This function is set up using
parameters b5-12 to b5-14.
• Feedback High Detection
Detected when the feedback rises above a certain level for longer than the specified time. This function is set up using
parameters b5-12, b5-36, and b5-37.
The following figure illustrates the working principle of feedback loss detection when the feedback signal is too low. Feedback
high detection works in the same way.
1.2 b: Application
YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual 41
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Parameter Details