5.2 b: Application
YASKAWA ELECTRIC SIEP C710616 35D YASKAWA AC Drive E1000 Technical Manual 151
■ b5-14: PI Feedback Loss Detection Time
Sets the time that the PI feedback has to fall below b5-13 before feedback loss is detected.
■
b5-36: PI Feedback High Detection Level
Sets the feedback level used for PI feedback high detection. The PI feedback has to exceed this level for longer than the
time b5-37 before feedback loss is detected.
■
b5-37: PI Feedback High Detection Time
Sets the time for that the PI feedback has to exceed b5-36 before feedback loss is detected.
■
PI Sleep/Snooze
The PI Sleep function stops the drive when the PI output or the frequency reference falls below the PI Sleep operation
level for a certain time. The drive will resume operating once the PI output or frequency reference rises above the PI
Sleep operation level for the specified time. An example of PI Sleep operation appears in the figure below.
Figure 5.18
Figure 5.18 PI Sleep Operation
Notes on using the PI Sleep function
• The PI Sleep function is always active, even if PI control is disabled.
• The PI Sleep function stops the motor according to the stopping method in b1-03.
The PI Snooze Function is a variation on the Sleep Function. The PI Snooze function must be selected by setting
parameter b5-21 = “2: Snooze”. Once the Snooze Function is selected, 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 PI Snooze Delay
Time (b5-23), the drive output shuts off. This is different from the PI Sleep Function because it is the feedback that must
drop below the PI Snooze Deactivation Level (b5-24) before normal drive output will begin again.
Just before the Snooze Function is activated, the PI Setpoint can be temporarily increased to create an overshoot of the
intended PI Setpoint. The temporary boost is determined by the PI Boost Setting Level (b5-25). Once the temporary
boost level is reached (or the PI Maximum Boost Time (b5-26) is exceeded), the drive output shuts off (snoozes) and the
intended PI Setpoint returns. From this point on, the Snooze Function operates normally and the drive output returns
when the feedback level drops below b5-24.
No. Name Setting Range Default
b5-14 PI Feedback Low Detection Time 0.0 to 25.5 s 1.0 s
No. Name Setting Range Default
b5-36 PI Feedback High Detection Level 0 to 100% 100%
No. Name Setting Range Default
b5-37 PI Feedback High Detection Time 0.0 to 25.5 s 1.0 s
PI Output
PI Sleep 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
SIEP_C710616_35.book 151 ページ ２０１５年１１月３０日 月曜日 午後２時２分
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