PID Control Bit
Factory Setting: 0
Settings Bit0 =1, PID reverse running must follow the setting of Pr.00-23
Bit0 = 0, PID reverse running follows PID’s calculated value
Bit0, when Pr.08-21 = 1, PID reverse running is enable.
Bit0 = 0, if the PID calculated value is positive, it will be forward running. If the PID calculated
value is negative, it will be reverse running.
There are three scenarios for sleep and wake-up frequency.
1) Frequency Command (PID is not in use, Pr.08-=00. Only works in VF mode)
When the output frequency ≦ the sleep frequency and the VFD reach the preset sleep time,
then the VFD will be at the sleep mode.
When the frequency command reaches the wake-up frequency, the VFD will start to count the
wake-up delay time. Then when the VFD reaches the wake-up delay time, the VFD will begin
acceleration time to reach the frequency command.
Frequency
Command
ActualOutputFrequency
Pr08-11
Pr08-10
Sleep
Reference Point
Wake up
eference Point
-
R
Pr08-12
0Hz
Sleep Time
frequency command
actual output frequency
Pr08-22
Wake-up
Delay
Time
2) Frequency Command Calculation of the Internal PID
When the PID calculation reaches the sleep frequency, the VFD will start to count the sleep
time and the output frequency will start to decrease. If the VFD exceeds the preset sleep time, it
will directly go to sleep mode which is 0 Hz. But if the VFD doesn’t reach the sleep time, it will
remain at the lower limit (if there is a preset of lower limit.). Or it will remain at the lowest output
frequency set at Pr.01-07 and wait to reach the sleep time then go to sleep mode (0 Hz).
When the calculated frequency command reaches the wake-up frequency, the VFD will start
to count the wake-up delay time. Once reaching the wake-up delay time, the VFD will start the
acceleration time to reach the PID frequency command.
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