YASKAWA FSDrive-MV1000 - Page 121

2.2 b: Application
YASKAWA ELECTRIC TOEP C710687 03B FSDrive-MV1000 Parameter Guide 121
n 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. This function is set up using
parameters b5-12 to b5-14.
• Feedback High Detection
Detected when the feedback rises beyond a certain level for longer than the specified time. This function is set up using
parameters b5-12, b5-36, and b5-37.
The following figure illustrates the working principle of feedback loss detection when the feedback signal is too low.
Feedback high detection works in the same way.
Figure 2.17
Figure 2.17 PID Feedback Loss Detection
Set parameters b5-12 to b5-14 to perform feedback loss detection and parameters b5-12, b5-36 and b5-37 to perform
feedback high detection.
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)
common_TMonly
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