YASKAWA A1000 Series Technical Manual page 156

5.2 b: Application
b5-07: PID Offset Adjustment
■
Sets the offset added to the PID controller output. Set as a percentage of the maximum frequency.
No.
b5-07
■ b5-08: PID Primary Delay Time Constant
Sets the time constant for the filter applied to the output of the PID controller. Normally, change is not required.
No.
b5-08
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.
b5-09: PID Output Level Selection
■
Normally a positive PID input (feedback smaller than setpoint) leads to positive PID output. Parameter b5-09 can be used
to reverse the sign of the PID controller output signal.
No.
b5-09
Setting 0: Normal Output
A positive PID input causes an increase in the PID output (direct acting).
Setting 1: Reverse Output
A positive PID input causes a decrease in the PID output (reverse acting).
b5-10: PID Output Gain Setting
■
Applies a gain to the PID output and can be helpful when the PID function is used to trim the frequency reference (b5-01
= 3 or 4).
No.
b5-10
■ b5-11: PID Output Reverse Selection
Determines whether a negative PID output reverses the direction of drive operation or not. When the PID function is used
to trim the frequency reference (b5-01 = 3 or 4), this parameter has no effect and the PID output will not be limited (same
as b5-11 = 1).
No.
b5-11
Setting 0: Reverse Disabled
Negative PID output will be limited to 0 and the drive output will be stopped.
Setting 1: Reverse Enabled
Negative PID output will cause the drive to run in the opposite direction.
■ PID Feedback Loss Detection
The PID feedback loss detection function can detect broken sensors or broken sensor wiring. It should be used whenever
PID 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.
156
Name
PID Offset Adjustment
Name
PID Primary Delay Time Constant
Parameter Name
PID Output Level Selection
Name
PID Output Gain Setting
Parameter Name
PID Output Reverse Selection
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Setting Range
-100.0 to 100.0%
Setting Range
0.00 to 10.00 s
Setting Range
0 or 1
Setting Range
0.00 to 25.00
Setting Range
0 or 1
Default
0.0%
Default
0.00 s
Default
0
Default
1.00
Default
0