YASKAWA FSDrive-MV1000 Parameter Manual page 115

b5-11: PID Output Reverse Selection
■
Determines whether a negative PID output reverses the direction of drive operation 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).
No.
b5-11
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.
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 explains the working principle of feedback loss detection when the feedback signal is too low.
Feedback high detection works in the same way.
Figure 2.16
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.
YASKAWA ELECTRIC EZZ010930 FSDrive-MV1000 Parameter Guide
Name
PID Output Reverse Selection
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
Figure 2.16 PID Feedback Loss Detection
Setting Range
0 or 1
common_TMonly
no FbL
detection
FbL detection
PID Feedback
Loss Detection Time
(b5-14)
2.2 b: Application
Default
0
time
115