YASKAWA E1000 - Page 149

5.2 b: Application
Parameter Details
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YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual 149
■ b5-09: PI Output Level Selection
Normally a positive PI input (feedback smaller than setpoint) leads to positive PI output. Parameter b5-09 can be used to
reverse the sign of the PI controller output signal.
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).
■
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).
■
b5-11: PI Output Reverse Selection
Determines whether a negative PI output reverses the direction of drive operation or not. When the PI function is used to
trim the frequency reference (b5-01 = 3), this parameter has no effect and the PI output will not be limited (same as b5-11
= 1).
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.
■
PI Feedback Loss Detection
The PI feedback loss detection function can detect broken sensors or broken sensor wiring. It should be used whenever 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 beyond 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 explains the working principle of feedback loss detection when the feedback signal is too low.
Feedback high detection works in the same way.
No. Parameter Name Setting Range Default
b5-09 PI Output Level Selection 0 or 1 0
No. Name Setting Range Default
b5-10 PI Output Gain Setting 0.00 to 25.00 1.00
No. Parameter Name Setting Range Default
b5-11 PI Output Reverse Selection 0 or 1 0
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