Yaskawa E7 Drive User Manual - Manual (Page 97)

Programming 5 - 23
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 Setpoint Boost Setting (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. See Fig 5.19 below.
b5-26 PI Maximum Boost Time
Setting Range: 0 to 3600 Seconds
Factory Default: 0 Seconds
Associated with the Snooze Function. In cases where the temporary PI Setpoint (intended PI setpoint + PI Setpoint Boost)
cannot be reached within the PI Maximum Boost Time (b5-26), the Setpoint Boost is interrupted and the Drive output is
turned off.
Fig 5.19 Snooze Function Operation
b5-27 PI Snooze Feedback Level
Setting Range: 0 to 100%
Factory Default: 60%
This is a second method of initiating the Snooze Function. If the PI feedback level exceeds the PI Snooze Feedback Level
(b5-27), then the Drive output shuts off. Once the PI feedback drops below the PI Snooze Deactivation Level (b5-24) then
normal Drive and PI operation return. Snooze activates if both b5-22 and b5-27 conditions are met. There is no time delay for
wake-up.
PI Feedback
PI Setpoint
PI Output
Snooze
Function
t
t
t
b5-22
b5-23
b5-23
Either PI
Feedback
reaches the new
boosted setpoint
value or the
maximum boost
b5-24
ON OFF OFF
PI Output
PI Setpoint
PI Feedback
Snooze
Function TIME
b5-26
Either PI Feedback
reaches the new
boosted setpoint value
or the maximum boost
time b5-26 is reached.
TM_E7_01_07182008.book Page 23 Wednesday, July 23, 2008 2:35 PM