YASKAWA A1000 Technical Manual page 177

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b5-47: PID Output Reverse Selection 2
Determines whether a negative PID output reverses the direction of drive operation. 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.
b5-47
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.
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Fine-Tuning PID
Once PID control parameters have been set, fine-tuning may be required. Follow the directions below.
Goal
Overshoot must be suppressed
Quickly achieve stability, and some
overshoot is permissible
Suppress long cycle oscillations (longer than
the integral time setting)
Suppress short cycle oscillations
YASKAWA ELECTRIC SIEP C710616 27G YASKAWA AC Drive A1000 Technical Manual
Name
PID Output Reverse Selection 2
Table 5.12 PID Fine Tuning
Tuning Procedure
• Reduce the derivative time (b5-05)
• increase the integral time (b5-03)
• Decrease the integral time (b5-03)
• Increase the derivative time (b5-05)
• Increase the integral time (b5-03)
• If oscillation cycle time is close to the derivative
time, the derivative part is likely having too much
influence. Reduce the derivative time (b5-05).
• If the derivative time is set to 0.00 s and
oscillations are still a problem, try reducing the
proportional gain (b5-02) or try increasing the
PID primary delay time (b5-08)
Setting Range
0, 1
Result
Response
Response
Response
Response
5.2 b: Application
Default
1
Before adjustment
After adjustment
Time
After adjustment
Before adjustment
Time
Before adjustment
After adjustment
Time
Before adjustment
After adjustment
Time
5
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