YASKAWA A1000 HHP Programming Manual page 39

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 above 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 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: Multi-Function Digital Outputs Only
Multi-function digital outputs 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. Multi-function digital outputs 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 multi-
function digital outputs reset 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
(H2-oo = 10). The drive will continue operation. The alarm and multi-function digital 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 (H2-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 PID feedback detection low level as a percentage of E1-04 (Maximum Output Frequency). The PID feedback must
fall below this level for longer than the time set to b5-14 before feedback loss is detected.
YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
Figure 1.22 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
1.2 b: Application
time
Default
0
1
39