27 July 2022
Understanding PID wake up function
Altivar 61 and 71
All models and serial numbers
There are several methods to consider depending if the thought process is in terms of PID error or PID feedback value. They have the same purpose but the method is different.
The following lists the three ways to configure PID Sleeping/Wake up in menu 1.7 Application Function
1. [SLE] Sleep Offset Threshold (ATV61 only)
2. [rSL] PID wake up Threshold (ATV61 and ATV71)
3. [UPP] PID Wake up Threshold (ATV61 only)
(1) Sleep Offset Threshold [SLE] – Frequency above low speed at which the
drive wakes up.
Set Low speed timeout [tSL]
Set Low speed [LSP]
Set Sleep Offset Threshold [SLE]
Following operation at LSP +SLE for a defined period
Low speed [LSP] = 20
Low speed timeout [tSL] = 60
Sleep Offset Threshold [SLE] = 10
The drive will sleep when the drive runs at low speed for 60 seconds
The drive will wake up when the speed reference is reaches 30 hz.
(2) [rSL] Restart error Threshold – The difference between the set point [rPI]
and the feedback [rPF].
To wake up the drive, the PID error [rPE] must equal the Restart error
If Set point [rPI] = 500 and Error [rSL] = 30
The drive will wake up when the PID error [rPE] is 30 below the Set point
(3) [UPP] Restart feedback Threshold – The actual set point at which the drive
will wake up.
To wake up the drive the PID Feedback will be equal to the PID Wake up
If Set point [rPI] = 500 and Wake up thres. [UPP] = 470
The drive will wake up when the PID Feedback [rPF] = 470.