YASKAWA A1000 Series Technical Manual page 157

• 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 5.24
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-
detection level set to b5-13 for the time set to b5-14 or longer. A digital output set for "PID feedback high" (H2-
3F) will be triggered if the PID feedback value is beyond the detection level set to b5-36 for longer than the times set to
b5-37. 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-
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-
an alarm output (H1-
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-
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-
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-
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-
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
Figure 5.24 PID Feedback Loss Detection
Parameter Name
PID Feedback Loss Detection Selection
= 10). The drive will continue operation. When the feedback value leaves the loss detection
no FbL
detection
FbL detection
PID Feedback
Loss Detection Time
(b5-14)
= 3E) will be triggered if the PID feedback value is below the
= 3F) will be triggered. Both events trigger
5.2 b: Application
common_TMonly
time
Setting Range Default
0 to 5
= 3E) will be triggered. If the
= E) and cause the drive to
= 19).
= 19).
= 19).
0
=
5
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