9-5
9.4
Sleep / Wakeup Function
The PID Sleep function can be used to prevent a system from running at low speeds and is frequently used in
pumping application. The PID Sleep function is turned on setting parameter 10-17 to a value greater than 0. The
inverter output turns off when the PID output falls below the PID sleep level (10-17) for the time specified in the
PID sleep delay time parameter (10-18).
The inverter wakes up from a sleep condition when the PID output (Reference frequency) rises above the PID
wake-up frequency (10-19) for the time specified in the PID wake-up delay time (10-20).
PID
Target
Value
Feedback
Value
+
-
PID=OFF
PID=ON
f
Soft Start
Output
Frequency
( Fout )
PID
Sleep/Wake- up
function
(Fref)
Freq Reference
t
10-18
Hz
T
10-19
10-17
10-20
Wake up
frequency
Sleep
frequency
PID output frequency
Actual output frequency
PID Sleep Function
