Omron VARISPEED E7 User Manual page 252

PI Snooze Function
By setting b5-21 to 2 the PI snooze function can be enabled. This software observes the PI feedback value and
the output frequency (Softstarter output) to switch 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 time longer than the snooze delay time b5-23 and when the feedback value is above the snooze
feedback value in b5-27. Before stopping the inverter finally, the PI setpoint can be boosted up to tempo-
rarily 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 falls below the wake up level b5-24.
The normal acceleration ramp is used.
PI Setpoint
Setpoint Boost (b5-25)
PI Feedback
Snooze Feedback Level (b5-27)
Wake-Up Level (b5-24)
SFS Output Freq.
t < b5-23
Snooze Level
(b5-22)
Normal PI operation
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.
NOTE
Snooze Delay
(b5-23)
Boost
Fig 6.60 PI Snooze Time Chart
Individual Functions
time
PI Setpoint + b5-25
time
normal
decel.
ramp
normal
accel.
ramp
time
Normal PI
Snooze
operation
6-95