YASKAWA OYMC V1000, Programming Manual

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1.2 b: Application
YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual 67
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b5-11: PID Output Reverse Selection
Determines whether a negative PID output reverses the drive operation direction 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).
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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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.
• Feedback High Detection :
Detected when the feedback rises beyond a certain level for longer than the specified time.
The figure below explains the working principle of feedback loss detection when the
feedback signal is too low. Feedback high detection works in the same way.
Figure 1.21
Figure 1.21 PID Feedback Loss Detection
No. Parameter Name Setting Range Default
b5-11 PID Output Reverse Selection 0 or 1 0
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
no FbL
detection
FbL detection
Time
PID Feedback
Loss Detection Time
(b5-14)