12.3 b: Application
528 YASKAWA SIEPC71061753C GA500 Technical Manual
Figure 12.30 Time Chart for PID Feedback Loss Detection Time
■ PID Sleep
PID sleep stops drive operation when the PID output or the frequency reference is less than b5-15 [PID Sleep
Function Start Level]. This function shuts off drive output after the motor decelerates to the set frequency.
The drive will automatically restart the motor when the PID output or the frequency reference is more than the b5-
15 value for the time set in b5-16 [PID Sleep Delay Time].
Figure 12.31 shows the PID Sleep function.
Figure 12.31 PID Sleep Time Chart
Note:
• The PID Sleep function is enabled when PID control is disabled.
• When the PID Sleep function is triggered, the drive will stop the motor as specified by b1-03 [Stopping Method Selection].
■ Fine-Tuning PID
Fine-tune the following parameter settings to have PID control eliminate problems with overshoot and oscillation.
• b5-02 [Proportional Gain (P)]
• b5-03 [Integral Time (I)]
• b5-05 [Derivative Time (D)]
• b5-08 [PID Primary Delay Time Constant]
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