YASKAWA E7U Programming Manual page 29

b5-24 PI Snooze Deactivation Level
Setting Range: 0 to 100%
Factory Default: 0%
The Snooze Function is a variation on the Sleep Function. The 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 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. See Figure 20 below.
b5-25 PI Setpoint Boost Setting
Setting Range: 0 to 100%
Factory Default: 0%
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 Figure 20 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.
PI Output
PI Output
PI Setpoint
PI Setpoint
PI Feedback
PI Feedback
Snooze
Snooze
Function
Function
b5-26
b5-23
OFF
ON
Either PI Feedback
Either PI
reaches the new
Feedback
boosted setpoint value
reaches the new
or the maximum boost
boosted setpoint
time b5-26 is reached.
value or the
maximum boost
Fig. 20 Snooze Function Operation
Programming 23
b5-23
OFF
b5-22
t
t
b5-24
t
TIME