YASKAWA CIMR-VU BA0001 Technical Manual page 141

Setting 1: Reverse Enabled
Negative PID output will cause the drive to run in the opposite direction.
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.
• Feedback High Detection:
Detected when the feedback rises beyond a certain level for longer than the specified time.
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.
The parameters necessary to set up the feedback loss detection are explained below.
n
b5-12: PID Feedback Loss Detection Selection
Enables or disables the feedback loss detection and sets the operation when a feedback loss is detected.
No.
b5-12
Setting 0: Digital Output Only
A digital output set for "PID feedback low" (H2-oo = 3E) will be triggered if the PID feedback value is below the detection
level set to b5-13 for the time set to b5-14 or longer. A digital output set for "PID feedback high" (H2-oo = 3F) will be
triggered if the PID feedback value is beyond the detection level set to b5-36 for the time set to b5-37 or longer. Neither a
fault nor an alarm is displayed on the digital operator. The drive will continue operation. When the feedback value leaves the
loss detection range, the output is reset.
Setting 1: Feedback Loss Alarm
If the PID feedback value falls below the level set to b5-13 for longer than the time set to b5-14, a "FBL - Feedback Low"
alarm will be displayed and a digital output set for "PID feedback low" (H2-oo = 3E) will be triggered. If the PID feedback
value exceeds the level set to b5-36 for longer than the time set to b5-37, a "FBH - Feedback High" alarm will be displayed
and a digital output set for "PID feedback high" (H2-oo = 3F) will be triggered. Both events trigger an alarm output (H1-
oo = 10). The drive will continue operation. When the feedback value leaves the loss detection range, the alarm and outputs
are reset.
Setting 2: Feedback Loss Fault
If the PID feedback value falls below the level set to b5-13 for longer than the time set to b5-14, a "FBL - Feedback Low"
fault will be displayed. If the PID feedback value exceeds the level set to b5-36 for longer than the time set to b5-37, a "FBH
- Feedback High" fault will be displayed. Both events trigger a fault output (H1-oo = E) and cause the drive to stop the
motor.
Setting 3: Digital Output Only, Even if PID is Disabled by Digital Input
Same as b5-12 = 0. Detection is still active even if PID is disabled by a digital input (H1-oo = 19).
YASKAWA ELECTRIC SIEP C710606 18F YASKAWA AC Drive – V1000 Technical Manual
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
Figure 5.19 PID Feedback Loss Detection
Parameter Name
PID Feedback Loss Detection Selection
no FbL
detection
FbL detection
PID Feedback
Loss Detection Time
(b5-14)
Setting Range
0 to 5
5.2 b: Application
time
Default
0
5
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