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.
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
no FbL
detection
FbL detection
time
PID Feedback
Loss Detection Time
(b5-14)
Figure 5.25 PID Feedback Loss Detection
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.
Parameter Name
Setting Range
Default
b5-12
PID Feedback Loss Detection Selection
0 to 5
0
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.
No.
Name
Setting Range
Default
b5-13
PID Feedback Low Detection Level
0 to 100%
0%
5.2 b: Application
212
YASKAWA ELECTRIC SIEP C710636 04D U1000 Industrial MATRIX Drive Technical Manual
Summary of Contents for U1000 iQpump Drive
Page 705: ......
