YASKAWA V1000 Technical Manual page 136

5.2 b: Application
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).
Setting 4: Feedback Loss Alarm, Even if PID is Disabled by Digital Input
Same as b5-12 = 1. Detection is still active even if PID is disabled by a digital input (H1-oo = 19).
Setting 5: Feedback Loss Fault, Even if PID is Disabled by Digital Input
Same as b5-12 = 2. Detection is still active even if PID is disabled by a digital input (H1-oo = 19).
n b5-13: PID Feedback Loss Detection Level
Sets the feedback level used for PID feedback loss detection. The PID feedback has to fall below this level for longer than
the time b5-14 before feedback loss is detected.
No.
b5-13
136
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
Name
PID Feedback Loss Detection Level
no FbL
detection
PID Feedback
Loss Detection Time
(b5-14)
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
time
FbL detection
Setting Range
0 to 5
Setting Range
0 to 100%
Default
0
Default
0%