YASKAWA GA700 Technical Manual page 620

11.3 b: Application
Note:
Setting more than one of the parameters H3-02, H3-06, and H3-10 to 16 will trigger oPE07 [MF Analog Input Selection Error].
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PID Control Block Diagram
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PID Feedback Loss Detection
The PID feedback loss detection function detects broken sensors and faulty wiring between the drive and sensors.
Be sure to use the PID feedback loss detection function whenever using PID control. The motor may suddenly
accelerate up to the maximum output frequency as a result of the feedback signal being too low. This function
prevents such risks to the load.
Feedback loss can be detected in two ways:
• PID Feedback Loss [FbL]
Set the following parameters to execute the PID feedback loss detection function.
The drive detects feedback loss when the feedback value falls below the value in b5-13 for longer than the time
in b5-14.
– b5-12 [Feedback Loss Detection Select]
– b5-13 [PID Feedback Loss Detection Lvl]
– b5-14 [PID Feedback Loss Detection Time]
• Excessive PID Feedback [FbH]
Set the following parameters to determine how the drive detects too high of a feedback level.
The drive detects excessive PID feedback when the feedback value rises above the value in b5-36 for longer
than the time in b5-37.
– b5-12 [Feedback Loss Detection Select]
– b5-36 [PID Feedback High Detection Lvl]
– b5-37 [PID Feedback High Detection Time]
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Figure 11.35 PID Control Block Diagram
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual