YASKAWA AC Drive-A1000 Technical Manual page 146

5.2 b: Application
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.
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 longer than the time set to b5-37. Neither a
fault nor an alarm is displayed on the digital operator and the drive will continue operation. The output resets when the feedback
value leaves the loss detection range.
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. The alarm and outputs reset when the feedback value leaves the loss detection
range.
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 remains active when 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 remains active when 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 remains active when PID is disabled by a digital input (H1-oo = 19).
n b5-13: PID Feedback Low Detection Level
Sets the feedback level used for PID feedback low detection. The PID feedback must fall below this level for longer than the
time set to b5-14 before feedback loss is detected.
No.
b5-13
146
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
Figure 5.23 PID Feedback Loss Detection
Parameter Name
PID Feedback Loss Detection Selection
Name
PID Feedback Low Detection Level
no FbL
detection
PID Feedback
Loss Detection Time
(b5-14)
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
time
FbL detection
Setting Range
0 to 5
Setting Range
0 to 100%
Default
0
Default
0%