Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 43)

Setting 5: Feedback Loss Fault
If the PI 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 PI 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. Detection
is disabled when PI is disabled by digital input (H1-oo = 19).
n b5-13: PI Feedback Low Detection Level
Sets the feedback level used for PI feedback low detection. The PI 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 PI Feedback Low Detection Level 0 to 100% 0%
n b5-14: PI Feedback Low Detection Time
Sets the time that the PI feedback has to fall below b5-13 before feedback loss is detected.
No. Name Setting Range Default
b5-14 PI Feedback Low Detection Time 0.0 to 25.5 s 1.0 s
n b5-36: PI Feedback High Detection Level
Sets the feedback level used for PI feedback high detection. The PI feedback must exceed this level for longer than the time
set to b5-37 before feedback loss is detected.
No. Name Setting Range Default
b5-36 PI Feedback High Detection Level 0 to 100% 100%
n b5-37: PI Feedback High Detection Time
Sets the time that the PI feedback must exceed the value set to b5-36 before feedback loss is detected.
No. Name Setting Range Default
b5-37 PI Feedback High Detection Time 0.0 to 25.5 s 1.0 s
n PI Sleep/Snooze
The PI Sleep/Snooze function stops the drive when the PI output or the frequency reference falls below the PID Sleep/Snooze
operation level for a certain time. The drive will resume operating when the PI output or frequency reference rise above the
PI Sleep/Snooze operation level for the specified time. An example of PI Sleep/Snooze operation appears in the figure below.
PI Output
PI Sleep/Snooze
Level (b5-15)
Sleep Delay Time
Sleep Delay Time
Run command enabled
Continues to output “During Run”
Internal Run
command
External Run
command
During Run
Stop
b5-16 b5-16
Run
Figure 1.18 PI Sleep/Snooze Operation
Notes on Using the PI Sleep/Snooze Function
• The PI Sleep/Snooze function is active even when PI control is disabled.
• The PI Sleep/Snooze function stops the motor according to the stopping method set to b1-03.
The PI Snooze Function is a variation on the Sleep Function. Set b5-21 to 2 to select the PI Snooze function. After selecting
the Snooze Function, the drive monitors the output frequency. If the output frequency drops below the PI Snooze Level (b5-22),
and stays below that level for at least the time set to b5-23, PI Snooze Delay Time, the drive output shuts off.
1.2 b: Application
YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual 43
1
Parameter Details