Parameter Details
12
12.3 b: Application
YASKAWA SIEPC71061737B GA800 Drive Technical Reference 689
• Excessive PID Feedback [FbH]
Set these parameters to set how the drive detects a feedback level that is too high.
The drive detects too much PID feedback when the feedback value is more than the value in b5-36 for longer than
the time in b5-37.
– b5-12 [Feedback Loss Detection Select]
– b5-36 [PID High Feedback Detection Lvl]
– b5-37 [PID High Feedback Detection Time]
Figure 12.36 shows the operation principle when the feedback value is too low, and the drive detects feedback loss.
The operation is the same when the drive detects too much feedback.
Figure 12.36 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 12.37 shows the PID Sleep function.
Figure 12.37 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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