YASKAWA V1000 Series Technical Manual page 127

No.
b5-11 PID Output Reverse Selection
Note: When reverse operation is prohibited (b1-04 = 1), PID output is limited to 0.
PID Feedback Loss Detection
b5-12: PID Feedback Reference Missing Detection Selection
n
b5-13: PID Feedback Loss Detection Level
n
b5-14: PID Feedback Loss Detection Time
n
The PID Feedback Loss Detection function should be used whenever PID control is enabled. If the feedback signal is lost, the output frequency will rise
up to the maximum output frequency.
No.
b5-12
b5-13
b5-14
When PID feedback is lost, the following operations may be selected:
Setting
0 Disabled. No detection PID feedback loss.
1 Alarm. Detection PID feedback loss. Continues operating during detection without triggering a fault contact.
2 Fault. A fault is output and the drive coasts to stop.
3 PID Feedback error detection disabled. Multi-function output only, detected during PID control cancel input only.
4 PID Feedback error detection enabled. An alarm is triggered and the drive continues running. Detected only when PID control is canceled.
5 PID Feedback error detection enabled. Fault is triggered and output is shut off. Detected only when PID control is canceled.
Note: Drive continues operating when an alarm is issued. A stop command is automatically issued when fault situation is detected. To cancel PID, set one of the multi-function inputs
H1-01through H1-07 to 19.
Detailed Description
• b5-12 = 0: An output will be triggered if the PID feedback value is below the detection level set to b5-13 for the time set in b5-14 when H2-oo = 3E.
• b5-12 = 1: If the PID feedback value falls below the PID feedback loss detection level (b5-13) for longer than the PID feedback loss detection time
(b5-14), a "FBL - Feedback Loss" alarm will be displayed drive will continue operation.
• b5-12 = 2: In the same situation described above, a "FBL - Feedback Loss" fault will be displayed and a stop command executed. The motor will coast
to stop and a fault relay triggered.
• b5-12 = 3: If the PID feedback value exceeds the PID feedback loss detection level (b5-13) for longer than the PID feedback loss detection time (b5-14),
a "FBL - Feedback Loss" alarm will be displayed and the drive will continue operation.
• b5-12 = 4: In the same situation described above, a "FBL - Feedback Loss" fault will be displayed and a stop command executed. The motor will coast
to stop and a fault relay triggered.
• b5-12 = 5: When PID feedback loss is detected, "FbH" appears on the operator to indicate excessive PID feedback, and fault output is triggered. The
drive will coast to stop.
The following time chart shows what happens when PID feedback is lost.
PID Sleep
b5-15: PID Sleep Function Start Level
n
b5-16: PID Sleep Delay Time
n
The PID Sleep function stops the drive when the PID output value falls below the PID Sleep operation level. The drive will resume operating once the
PID output value rises above the PID Sleep operation level for the specified time.
YASKAWA ELECTRIC SIEP C710606 18A YASKAWA AC Drive – V1000 Technical Manual (Preliminary)
Parameter Name
0: Zero Limit (when PID output goes negative, the drive stops)
1: Drive reverses when PID turns negative
Parameter Name
PID Feedback Reference Missing Detection Selection
PID Feedback Loss Detection Level
PID Feedback Loss Detection Time
PID feedback value
PID
Feedback
Detection
Loss Level
(b5-13)
PID Feedback
Loss Detection Time
(b5-14)
Figure 5.17 PID Feedback Loss Detection
Setting Range
Description
no FbL
detection
FbL detection
PID Feedback
Loss Detection Time
(b5-14)
5.2 b: Setup
Default
0
Setting Range Default
0 to 5 0
0 to 100 0%
0.0 to 25.5 1.0 s
time
5
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