Mitsubishi Electric FR-F820-00077 Instruction Manual page 577

Parameters
Pr.
1380
A455
1381
A456
PID output hold (Pr. 1361 and Pr. 1362)
● The manipulated amount (PID output) can be fixed when the fluctuation of the deviation is small.
This function eliminates unnecessary acceleration/deceleration, which is effective to reduce the
power consumption.
● When the deviation falls within the Pr. 1362 "PID output hold range" and the elapsed time exceeds
the Pr. 1361 "Detection time for PID output hold", the manipulated amount (PID output) is fixed
at the output frequency at that time.
● Even if the deviation falls out of the PID output hold range, the manipulated amount (PID output)
is kept during the detection time for PID output hold.
Output value
Set point
Manipulated
Fig. 5-195:
NOTES While the PID output is held, calculation is not performed for the P term, I term, and D term. For
the P and I terms, the values at the start of the holding period are kept. The D term is set to "0".
When the control switches between the first PID control and second PID control, the PID output
holding state is cancelled.
The PID output holding function is disabled in the following cases:
When Pr. 1362 = "9999", while the PID setting is not applied to the frequency, during the sleep
function, at switching to the auxiliary motor in the multi-pump function, during PID gain tuning,
and during the sleep boost.
FR-F800
Name
PID input pressure
warning set point change
amount
PID input pressure fault
operation selection
Detection time for PID output hold
Pr. 1361
Deviation
Measured value
amount
PID output hold
Initial
Setting range Description
value
Set the set point change amount when the pressure
5% 0 to 100%
reaches the input pressure warning level.
The protective function (E.PID) for the input pressure
0
fault is activated.
0
A deceleration stop is performed when the input
1
pressure fault occurs.
Detection time for PID output hold
PID output is held.
(A) Application parameters
Pr. 1361
PID output hold range
(Pr. 1362)
Time
Time
I003061E
5 - 405