Omron VARISPEED E7 User Manual page 231

PI Snooze Function
By setting b5-21 to 2 the PI snooze function can be enabled. This software observes the output frequency
(Softstarter output) and the PI feedback value to turn the inverter ON and OFF automatically as the system
requires.
Snooze Activation
•
The inverter stops operation when the output frequency (Softstarter output) falls below the snooze level
b5-22 for a longer time than the snooze delay time b5-23 and the feedback value is above the snooze feed-
back value in b5-27. Before stopping the inverter finally, the PI setpoint is boosted up to temporarily over-
satisfy the load and thereby to avoid a short cycle ON and OFF switching of the inverter. The boost level is
set in parameter b5-25 and it is set as percentage of the PI setpoint value, but the maximum time for boost
operation is set in b5-26.
Wake up
•
The inverter resumes the normal PI operation when the PI feedback exceeds the wake up level b5-24. The
normal acceleration ramp is used.
Snooze Feedback Level (b5-27)
Wake-Up Level (b5-24)
6
INFO
92
6-
PI Setpoint
Setpoint Boost (b5-25)
PI Feedback
SFS Output Freq.
Snooze Delay
t < b5-23
Snooze Level
(b5-22)
Normal PI operation
Fig 6.53 PI Snooze Time Chart
Using the parameter b5-21 either sleep operation or snooze operation can be enabled. It is impossible to
enable both functions at the same time.
normal
decel.
(b5-23)
ramp
Boost Snooze
time
PI Setpoint + b5-25
time
normal
accel.
ramp
time
Normal PI
operation